- add drone build badge

- move IGBaseObject to main lib
- mark InitializeFromString() obsolete

.drone.yml

@@ -0,0 +1,14 @@
+kind: pipeline
+type: docker
+name: CI
+
+steps:
+  - name: Build
+    image: mcr.microsoft.com/dotnet/sdk:5.0
+    commands:
+    - dotnet build
+  
+  - name: Test
+    image: mcr.microsoft.com/dotnet/sdk:5.0
+    commands:
+    - dotnet test

.idea/.idea.GBase/.idea/encodings.xml

@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="Encoding" addBOMForNewFiles="with BOM under Windows, with no BOM otherwise" />
-</project>

.idea/.idea.GBase/.idea/modules.xml

@@ -2,7 +2,7 @@
 <project version="4">
   <component name="ProjectModuleManager">
     <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/.idea.GBase/riderModule.iml" filepath="$PROJECT_DIR$/.idea/.idea.GBase/riderModule.iml" />
+      <module fileurl="file://$PROJECT_DIR$/.idea/.idea.GBase/.idea/riderModule.iml" filepath="$PROJECT_DIR$/.idea/.idea.GBase/.idea/riderModule.iml" />
     </modules>
   </component>
 </project>

.idea/.idea.GBase/.idea/riderModule.iml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="RIDER_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$USER_HOME$/.nuget/packages/microsoft.net.test.sdk/16.5.0/build/netcoreapp2.1" />
+    <content url="file://$USER_HOME$/.nuget/packages/microsoft.testplatform.testhost/16.5.0/build/netcoreapp2.1/x64/testhost.dll" />
+    <content url="file://$USER_HOME$/.nuget/packages/microsoft.testplatform.testhost/16.5.0/build/netcoreapp2.1/x64/testhost.exe" />
+    <content url="file://$USER_HOME$/.nuget/packages/nunit3testadapter/3.16.1/build/netcoreapp2.1/NUnit3.TestAdapter.dll" />
+    <content url="file://$USER_HOME$/.nuget/packages/nunit3testadapter/3.16.1/build/netcoreapp2.1/NUnit3.TestAdapter.pdb" />
+    <content url="file://$USER_HOME$/.nuget/packages/nunit3testadapter/3.16.1/build/netcoreapp2.1/nunit.engine.api.dll" />
+    <content url="file://$USER_HOME$/.nuget/packages/nunit3testadapter/3.16.1/build/netcoreapp2.1/nunit.engine.dll" />
+    <content url="file://$MODULE_DIR$/../.." />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

GBase.Api/GBase.Api.xml

@@ -102,17 +102,6 @@
             The new value
             </summary>
         </member>
-        <member name="T:GBase.Api.IGBaseObject">
-            <summary>
-            GBase object that allows conversion from <see cref="T:System.String"/>
-            </summary>
-        </member>
-        <member name="M:GBase.Api.IGBaseObject.InitializeFromString(System.String)">
-            <summary>
-            Initialize this <see cref="T:GBase.Api.IGBaseObject"/> from a given <see cref="T:System.String"/>
-            </summary>
-            <param name="string">The given <see cref="T:System.String"/></param>
-        </member>
         <member name="T:GBase.Api.INotifyGBaseEntryChanged">
             <summary>
             Notify the GBase that an entry has changed

GBase.Api/IGBaseObject.cs

@@ -1,18 +0,0 @@
-// Author: Gockner, Simon
-// Created: 2020-02-14
-// Copyright(c) 2020 SimonG. All Rights Reserved.
-
-namespace GBase.Api
-{
-    /// <summary>
-    /// GBase object that allows conversion from <see cref="string"/>
-    /// </summary>
-    public interface IGBaseObject
-    {
-        /// <summary>
-        /// Initialize this <see cref="IGBaseObject"/> from a given <see cref="string"/>
-        /// </summary>
-        /// <param name="string">The given <see cref="string"/></param>
-        void InitializeFromString(string @string);
-    }
-}

GBase.sln.DotSettings

@@ -2,5 +2,6 @@
 	<s:String x:Key="/Default/CodeStyle/FileHeader/FileHeaderText/@EntryValue">Author: $USER_NAME$&#xD;
 Created: $CREATED_YEAR$-$CREATED_MONTH$-$CREATED_DAY$&#xD;
 Copyright(c) $CREATED_YEAR$ SimonG. All Rights Reserved.</s:String>
+	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/PredefinedNamingRules/=Constants/@EntryIndexedValue">&lt;Policy Inspect="True" Prefix="" Suffix="" Style="AA_BB" /&gt;</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/PredefinedNamingRules/=PrivateConstants/@EntryIndexedValue">&lt;Policy Inspect="True" Prefix="" Suffix="" Style="AA_BB" /&gt;</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/PredefinedNamingRules/=PrivateStaticReadonly/@EntryIndexedValue">&lt;Policy Inspect="True" Prefix="_" Suffix="" Style="aaBb" /&gt;</s:String></wpf:ResourceDictionary>

GBase/Attributes/GBaseColumnAttribute.cs

@@ -13,6 +13,11 @@ namespace GBase.Attributes
     [AttributeUsage(AttributeTargets.Property)]
     public class GBaseColumnAttribute : Attribute
     {
+        public GBaseColumnAttribute(bool isKey = false)
+        {
+            IsKey = isKey;
+        }
         
+        public bool IsKey { get; }
     }
 }

GBase/Attributes/GBaseTableAttribute.cs

@@ -13,6 +13,11 @@ namespace GBase.Attributes
     [AttributeUsage(AttributeTargets.Class)]
     public class GBaseTableAttribute : Attribute //TODO: Decide how to handle enums (as table or their own type)
     {
+        public GBaseTableAttribute(string folderName)
+        {
+            FolderName = folderName;
+        }
         
+        public string FolderName { get; }
     }
 }

GBase/DataHandling/Cache/XmlDataHandlerCache.cs

@@ -4,7 +4,9 @@
 
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
 using GBase.DataHandling.Cache.Factories;
 using GBase.Interfaces.DataHandling.Cache;
@@ -103,9 +105,11 @@ namespace GBase.DataHandling.Cache
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> that implements the property</typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
         /// <param name="propertyName">The name of the property</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>An <see cref="IEnumerable{T}"/> with all the values for the property</returns>
-        public async Task<IEnumerable<TProperty>> TryGetValues<T, TProperty>(string propertyName)
+        public async Task<IEnumerable<TProperty>> TryGetValues<T, TProperty>(FileStream file, string propertyName, CancellationToken cancellationToken)
         {
             IXmlDataHandlerCacheEntry entry = _cache.FirstOrDefault(e => e.Type == typeof(T));
             IDataHandlerCachePropertyEntry property = entry?.Properties.FirstOrDefault(p => p.PropertyName.Equals(propertyName));
@@ -114,7 +118,7 @@ namespace GBase.DataHandling.Cache
 
             if (!property.IsInitialized) //initialize property by reading the values from the xml
             {
-                List<TProperty> values = (await _xmlDataReader.Read<T, TProperty>(propertyName))?.ToList();
+                List<TProperty> values = (await _xmlDataReader.Read<T, TProperty>(file, propertyName, cancellationToken))?.ToList();
                 if (values != null)
                 {
                     foreach (TProperty value in values.Where(value => !property.Values.Any(v => v.Equals(value))))

GBase/DataHandling/Exceptions/InvalidXmlFileException.cs

@@ -0,0 +1,17 @@
+// Author: Gockner, Simon
+// Created: 2020-11-09
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace GBase.DataHandling.Exceptions
+{
+    public class InvalidXmlFileException : Exception
+    {
+        public InvalidXmlFileException(string message)
+            : base(message)
+        {
+            
+        }
+    }
+}

GBase/DataHandling/Factories/IDataHandlerFactory.cs

@@ -0,0 +1,13 @@
+// Author: Simon Gockner
+// Created: 2020-09-19
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using GBase.Interfaces.DataHandling;
+
+namespace GBase.DataHandling.Factories
+{
+    public interface IDataHandlerFactory
+    {
+        IDataHandler Create();
+    }
+}

GBase/DataHandling/Factories/IXmlDataReaderFactory.cs

@@ -14,8 +14,7 @@ namespace GBase.DataHandling.Factories
         /// <summary>
         /// Creates an <see cref="IXmlDataReader"/>
         /// </summary>
-        /// <param name="path">The path to the xml file</param>
         /// <returns>A newly created instance of the implementation for <see cref="IXmlDataReader"/></returns>
-        IXmlDataReader Create(string path);
+        IXmlDataReader Create();
     }
 }

GBase/DataHandling/Factories/IXmlDataWriterFactory.cs

@@ -14,9 +14,7 @@ namespace GBase.DataHandling.Factories
         /// <summary>
         /// Creates an <see cref="IXmlDataWriter"/>
         /// </summary>
-        /// <param name="path">The path to the xml file</param>
-        /// <param name="rootElementName">The root element name of the xml file</param>
         /// <returns>A newly created instance of the implementation for <see cref="IXmlDataWriter"/></returns>
-        IXmlDataWriter Create(string path, string rootElementName);
+        IXmlDataWriter Create();
     }
 }

GBase/DataHandling/Factories/Pool/IPoolItemFactory.cs

@@ -0,0 +1,13 @@
+// Author: Simon Gockner
+// Created: 2020-09-19
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using GBase.Interfaces.DataHandling.Pool;
+
+namespace GBase.DataHandling.Factories.Pool
+{
+    public interface IPoolItemFactory
+    {
+        IPoolItem<T> Create<T>(T item);
+    }
+}

GBase/DataHandling/Factories/Pool/IPoolRequestFactory.cs

@@ -0,0 +1,13 @@
+// Author: Simon Gockner
+// Created: 2020-09-19
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using GBase.Interfaces.DataHandling.Pool;
+
+namespace GBase.DataHandling.Factories.Pool
+{
+    public interface IPoolRequestFactory
+    {
+        IPoolRequest Create(object requester);
+    }
+}

GBase/DataHandling/Factories/Pool/PoolItemFactory.cs

@@ -0,0 +1,14 @@
+// Author: Simon Gockner
+// Created: 2020-09-19
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using GBase.DataHandling.Pool;
+using GBase.Interfaces.DataHandling.Pool;
+
+namespace GBase.DataHandling.Factories.Pool
+{
+    public class PoolItemFactory : IPoolItemFactory
+    {
+        public IPoolItem<T> Create<T>(T item) => new PoolItem<T>(item);
+    }
+}

GBase/DataHandling/Pool/DataHandlerPool.cs

@@ -0,0 +1,94 @@
+// Author: Simon Gockner
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using GBase.DataHandling.Factories;
+using GBase.DataHandling.Factories.Pool;
+using GBase.Interfaces.DataHandling;
+using GBase.Interfaces.DataHandling.Pool;
+
+namespace GBase.DataHandling.Pool
+{
+    public class DataHandlerPool : IDataHandlerPool
+    {
+        private readonly int _availableDataHandlers;
+        private readonly IPoolItemFactory _poolItemFactory;
+        private readonly IPoolRequestFactory _poolRequestFactory;
+        private readonly IDataHandlerFactory _dataHandlerFactory;
+        
+        private readonly List<IPoolItem<IDataHandler>> _pool;
+        private readonly List<IPoolRequest> _waitingRequesters;
+
+        public DataHandlerPool(int availableDataHandlers,
+            IPoolItemFactory poolItemFactory,
+            IPoolRequestFactory poolRequestFactory,
+            IDataHandlerFactory dataHandlerFactory)
+        {
+            _availableDataHandlers = availableDataHandlers;
+            _poolItemFactory = poolItemFactory;
+            _poolRequestFactory = poolRequestFactory;
+            _dataHandlerFactory = dataHandlerFactory;
+
+            _pool = new List<IPoolItem<IDataHandler>>();
+            _waitingRequesters = new List<IPoolRequest>();
+        }
+        
+        public async Task<IPoolItem<IDataHandler>> RequestDataHandler(object requester, bool overwrite, CancellationToken cancellationToken)
+        {
+            if (_pool.All(i => i.InUse) && _pool.Count == _availableDataHandlers) //no free dataHandlers available
+                return await WaitForDataHandler(requester, cancellationToken);
+            else if (_pool.All(i => i.InUse)) //every existing dataHandler is used -> create a new one
+                return CreateDataHandler(overwrite);
+            else //there are unused dataHandlers existing
+                return GetDataHandler();
+        }
+
+        private async Task<IPoolItem<IDataHandler>> WaitForDataHandler(object requester, CancellationToken cancellationToken)
+        {
+            IPoolItem<IDataHandler> dataHandlerItem = null;
+            IPoolRequest request = _poolRequestFactory.Create(requester);
+            
+            while (dataHandlerItem == null)
+            {
+                if (_waitingRequesters.Contains(request) && _waitingRequesters.IndexOf(request) == 0) //request is in list and is first
+                {
+                    if (_pool.Any(i => !i.InUse))
+                        dataHandlerItem = GetDataHandler();
+                    else
+                        await Task.Delay(1000, cancellationToken);
+                }
+                else if (_waitingRequesters.Contains(request)) //request is in list but not first
+                    await Task.Delay(1000, cancellationToken);
+                else
+                    _waitingRequesters.Add(request);
+            }
+
+            _waitingRequesters.Remove(request);
+
+            return dataHandlerItem;
+        }
+
+        private IPoolItem<IDataHandler> CreateDataHandler(bool overwrite)
+        {
+            IPoolItem<IDataHandler> item = _poolItemFactory.Create(_dataHandlerFactory.Create());
+            item.Item.Init(overwrite);
+            _pool.Add(item);
+
+            return item;
+        }
+
+        private IPoolItem<IDataHandler> GetDataHandler() => _pool.First(i => !i.InUse);
+
+        public async ValueTask DisposeAsync()
+        {
+            while (_waitingRequesters.Any())
+            {
+                await Task.Delay(1000);
+            }
+        }
+    }
+}

GBase/DataHandling/Pool/PoolItem.cs

@@ -0,0 +1,27 @@
+// Author: Simon Gockner
+// Created: 2020-09-19
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using GBase.Interfaces.DataHandling.Pool;
+
+namespace GBase.DataHandling.Pool
+{
+    public class PoolItem<T> : IPoolItem<T>
+    {
+        public PoolItem(T item)
+        {
+            Item = item;
+        }
+        
+        public T Item { get; }
+        public bool InUse { get; private set; }
+        
+        public T Use()
+        {
+            InUse = true;
+            return Item;
+        }
+
+        public void Dispose() => InUse = false;
+    }
+}

GBase/DataHandling/Pool/PoolRequest.cs

@@ -0,0 +1,18 @@
+// Author: Simon Gockner
+// Created: 2020-09-19
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using GBase.Interfaces.DataHandling.Pool;
+
+namespace GBase.DataHandling.Pool
+{
+    public class PoolRequest : IPoolRequest
+    {
+        public PoolRequest(object requester)
+        {
+            Requester = requester;
+        }
+
+        public object Requester { get; }
+    }
+}

GBase/DataHandling/XmlDataHandler.cs

@@ -5,12 +5,15 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
+using System.Reflection;
 using System.Threading;
 using System.Threading.Tasks;
 using GBase.DataHandling.Cache.Factories;
 using GBase.DataHandling.Factories;
 using GBase.Helpers;
+using GBase.Interfaces;
 using GBase.Interfaces.DataHandling;
 using GBase.Interfaces.DataHandling.Xml;
 using GBase.Interfaces.DataHandling.Xml.Cache;
@@ -45,19 +48,15 @@ namespace GBase.DataHandling
         /// <summary>
         /// A <see cref="IDataHandler"/> that handles its data in an xml file
         /// </summary>
-        /// <param name="path">The path to the xml file</param>
-        /// <param name="rootElementName">The root element name of the xml file</param>
         /// <param name="xmlDataReaderFactory">The <see cref="IXmlDataReader"/> factory</param>
         /// <param name="xmlDataWriterFactory">The <see cref="IXmlDataWriter"/> factory</param>
         /// <param name="xmlDataHandlerCacheFactory">The <see cref="IXmlDataHandlerCache"/> factory</param>
-        public XmlDataHandler(string path,
-            string rootElementName,
-            IXmlDataReaderFactory xmlDataReaderFactory,
+        public XmlDataHandler(IXmlDataReaderFactory xmlDataReaderFactory,
             IXmlDataWriterFactory xmlDataWriterFactory,
             IXmlDataHandlerCacheFactory xmlDataHandlerCacheFactory)
         {
-            _xmlDataWriter = xmlDataWriterFactory.Create(path, rootElementName);
-            _xmlDataReader = xmlDataReaderFactory.Create(path);
+            _xmlDataWriter = xmlDataWriterFactory.Create();
+            _xmlDataReader = xmlDataReaderFactory.Create();
 
             _cache = xmlDataHandlerCacheFactory.Create(_xmlDataReader);
         }
@@ -66,35 +65,57 @@ namespace GBase.DataHandling
         /// Initialize the <see cref="XmlDataHandler"/>
         /// </summary>
         /// <param name="overwrite">If true an existing value is overwritten, if false an additional value is added</param>
-        /// <param name="cancellationToken">A <see cref="CancellationToken"/> to cancel the async operation</param>
         /// <returns>Returns true if successful, false if not</returns>
-        public async Task<bool> Init(bool overwrite, CancellationToken cancellationToken)
+        public bool Init(bool overwrite)
         {
             if (_isInitialized)
                 return false;
 
             _overwrite = overwrite;
 
-            if (!await _xmlDataWriter.Init(cancellationToken))
-                return false;
+            _isInitialized = true;
+            return true;
+        }
 
-            if (!await _xmlDataReader.Init(cancellationToken))
-                return false;
+        public async Task<bool> AddEntry<T>(T entry, IGBaseTable table, FileStream entryFile, CancellationToken cancellationToken)
+        {
+            await _xmlDataWriter.InitFile(entryFile, table.Type.Name, cancellationToken);
             
-            _isInitialized = true;
+            foreach (var column in table.Columns)
+            {
+                //set value for each column
+                PropertyInfo property = entry.GetType().GetProperty(column.Name);
+                if (property == null)
+                    continue; //TODO: What to do in this case? (Shouldn't really happen...)
+
+                string valueString;
+                if (property.PropertyType != typeof(string) && property.GetValue(entry) is IEnumerable enumerable)
+                    valueString = enumerable.ToGBaseString();
+                else
+                    valueString = property.GetValue(entry).ToString();
+                    
+                await _xmlDataWriter.Write<T>(entryFile, property.Name, valueString, property.PropertyType, _overwrite, cancellationToken);
+            }
 
             return true;
         }
 
+        public Task<bool> RemoveEntry<T>(T entry)
+        {
+            throw new NotImplementedException();
+        }
+
         /// <summary>
         /// Set the value for the given property
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> that implements the property</typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="entryFile"></param>
         /// <param name="propertyName">The name of the property</param>
         /// <param name="value">The value to set</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>A <see cref="Task"/> to await</returns>
-        public async Task SetValue<T, TProperty>(string propertyName, TProperty value)
+        public async Task SetValue<T, TProperty>(FileStream entryFile, string propertyName, TProperty value, CancellationToken cancellationToken)
         {
             if (value == null)
                 return;
@@ -106,7 +127,7 @@ namespace GBase.DataHandling
                 valueString = value.ToString();
 
             await _cache.SetValue<T, TProperty>(propertyName, value, _overwrite);
-            await _xmlDataWriter.Write<T, TProperty>(propertyName, valueString, _overwrite);
+            await _xmlDataWriter.Write<T, TProperty>(entryFile, propertyName, valueString, _overwrite, cancellationToken);
         }
 
         /// <summary>
@@ -114,10 +135,12 @@ namespace GBase.DataHandling
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="entryFile"></param>
         /// <param name="propertyName">The name of the property</param>
         /// <param name="value">The value to set</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>A <see cref="Task"/> to await</returns>
-        public async Task RemoveValue<T, TProperty>(string propertyName, TProperty value)
+        public async Task RemoveValue<T, TProperty>(FileStream entryFile, string propertyName, TProperty value, CancellationToken cancellationToken)
         {
             if (value == null)
                 return;
@@ -129,7 +152,7 @@ namespace GBase.DataHandling
                 valueString = value.ToString();
 
             await _cache.TryRemoveValue<T, TProperty>(propertyName, value);
-            await _xmlDataWriter.Remove<T, TProperty>(propertyName, valueString);
+            await _xmlDataWriter.Remove<T, TProperty>(entryFile, propertyName, valueString, cancellationToken);
         }
 
         /// <summary>
@@ -137,11 +160,13 @@ namespace GBase.DataHandling
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> that implements the property</typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
         /// <param name="propertyName">The name of the property</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>The value for the given property</returns>
-        public async Task<TProperty> GetValue<T, TProperty>(string propertyName)
+        public async Task<TProperty> GetValue<T, TProperty>(FileStream file, string propertyName, CancellationToken cancellationToken)
         {
-            IEnumerable<TProperty> enumerable = await GetValues<T, TProperty>(propertyName);
+            IEnumerable<TProperty> enumerable = await GetValues<T, TProperty>(file, propertyName, cancellationToken);
             return enumerable == null ? default : enumerable.FirstOrDefault();
         }
 
@@ -150,25 +175,17 @@ namespace GBase.DataHandling
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> that implements the property</typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
         /// <param name="propertyName">The name of the property</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>An <see cref="IEnumerable{T}"/> with all the values for the property</returns>
-        public async Task<IEnumerable<TProperty>> GetValues<T, TProperty>(string propertyName)
+        public async Task<IEnumerable<TProperty>> GetValues<T, TProperty>(FileStream file, string propertyName, CancellationToken cancellationToken)
         {
-            IEnumerable<TProperty> cachedValues = await _cache.TryGetValues<T, TProperty>(propertyName);
+            IEnumerable<TProperty> cachedValues = await _cache.TryGetValues<T, TProperty>(file, propertyName, cancellationToken);
             if (cachedValues != null)
                 return cachedValues;
 
-            return await _xmlDataReader.Read<T, TProperty>(propertyName);
-        }
-
-        /// <summary>
-        /// Dispose used resources asynchronously
-        /// </summary>
-        /// <returns>A <see cref="ValueTask"/> to await</returns>
-        public async ValueTask DisposeAsync()
-        {
-            await _xmlDataReader.DisposeAsync();
-            await _xmlDataWriter.DisposeAsync();
+            return await _xmlDataReader.Read<T, TProperty>(file, propertyName, cancellationToken);
         }
     }
 }

GBase/DataHandling/XmlDataReader.cs

@@ -10,76 +10,56 @@ using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Xml.Linq;
+using GBase.DataHandling.Exceptions;
 using GBase.Helpers;
+using GBase.Interfaces;
 using GBase.Interfaces.DataHandling;
 using GBase.Interfaces.DataHandling.Xml;
 
 namespace GBase.DataHandling
 {
     /// <summary>
-    /// A <see cref="IDataReader"/> that reads from a xml file
+    /// An <see cref="IDataReader"/> that reads from a xml file
     /// </summary>
     public class XmlDataReader : IXmlDataReader
     {
-        private readonly FileStream _file;
-        private XDocument _xmlDocument;
-        private XElement _rootElement;
-
-        private bool _isInitialized;
-        private CancellationToken _cancellationToken;
+        private readonly IGBase _gBase;
 
         /// <summary>
-        /// A <see cref="IDataReader"/> that reads from a xml file
+        /// An <see cref="IDataReader"/> that reads from a xml file
         /// </summary>
-        /// <param name="path">The path to the xml file</param>
-        public XmlDataReader(string path)
-        {
-            _file = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
-        }
-
-        /// <summary>
-        /// Initialize the <see cref="XmlDataReader"/>
-        /// </summary>
-        /// <param name="cancellationToken">A <see cref="CancellationToken"/> to cancel the async operation</param>
-        /// <returns>Returns true if successful, false if not</returns>
-        /// <exception cref="Exception">No root element found</exception>
-        public async Task<bool> Init(CancellationToken cancellationToken)
-        {
-            if (_isInitialized)
-                return false;
-
-            _cancellationToken = cancellationToken;
-            _xmlDocument = await XDocument.LoadAsync(_file, LoadOptions.None, _cancellationToken);
-
-            _rootElement = _xmlDocument.Root;
-            if (_rootElement == null)
-                throw new Exception("No root element found.");
-
-            _isInitialized = true;
-
-            return true;
-        }
+        /// <param name="gBase">The <see cref="IGBase"/></param>
+        public XmlDataReader(IGBase gBase) => _gBase = gBase;
 
         /// <summary>
         /// Read the data of a property
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/></typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
         /// <param name="propertyName">The name of the property</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>The data of the given property, null if no data found</returns>
         /// <exception cref="ArgumentNullException"><paramref name="propertyName"/></exception>
         /// <exception cref="InvalidOperationException">Invalid <see cref="Type"/> found for the read object</exception>
-        public async Task<IEnumerable<TProperty>> Read<T, TProperty>(string propertyName)
+        public async Task<IEnumerable<TProperty>> Read<T, TProperty>(FileStream file, string propertyName, CancellationToken cancellationToken)
         //TODO: Read currently doesn't work for newly added items -> probably because file was loaded before new items were added; is probably not a problem -> cache
         {
             string typeName = typeof(T).FullName;
             if (typeName == null)
                 throw new ArgumentNullException(nameof(typeName));
 
+            file.Seek(0, SeekOrigin.Begin); //reset stream to it's beginning to be able to load it
+            XDocument xmlDocument = await XDocument.LoadAsync(file, LoadOptions.None, cancellationToken);
+            file.Seek(0, SeekOrigin.Begin); //reset stream to it's beginning to be able to save it
+            
             return await Task.Run(() =>
             {
-                XElement typeElement = _rootElement.Element(typeName);
-                XElement propertyElement = typeElement?.Element(propertyName);
+                XElement rootElement = xmlDocument.Root;
+                if (rootElement == null)
+                    throw new InvalidXmlFileException("No root element is set.");
+                
+                XElement propertyElement = rootElement.Element(propertyName);
                 XAttribute propertyTypeAttribute = propertyElement?.Attribute(XmlDataHandler.VALUE_TYPE_ATTRIBUTE_NAME);
                 if (propertyTypeAttribute == null)
                     return null;
@@ -95,19 +75,10 @@ namespace GBase.DataHandling
                 IEnumerable<string> values = valueElements.Select(v => v.Value);
 
                 if (typeof(TProperty) != typeof(string) && typeof(TProperty).GetInterfaces().Contains(typeof(IEnumerable))) //read property is an IEnumerable
-                    return values.Select(Enumerables.ConvertToGBaseEnumerable<TProperty>).ToList();
+                    return values.Select(s => Enumerables.ConvertToGBaseEnumerable<TProperty>(s, _gBase)).ToList();
 
                 return values.Select(value => (TProperty) Convert.ChangeType(value, typeof(TProperty))).ToList();
-            }, _cancellationToken);
-        }
-
-        /// <summary>
-        /// Dispose used resources asynchronously
-        /// </summary>
-        /// <returns>A <see cref="ValueTask"/> to await</returns>
-        public async ValueTask DisposeAsync()
-        {
-            await _file.DisposeAsync();
+            }, cancellationToken);
         }
     }
 }

GBase/DataHandling/XmlDataWriter.cs

@@ -8,6 +8,7 @@ using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Xml.Linq;
+using GBase.DataHandling.Exceptions;
 using GBase.Interfaces.DataHandling;
 using GBase.Interfaces.DataHandling.Xml;
 
@@ -18,81 +19,68 @@ namespace GBase.DataHandling
     /// </summary>
     public class XmlDataWriter : IXmlDataWriter
     {
-        private readonly string _rootElementName;
-        private readonly FileStream _file;
-
-        private XDocument _xmlDocument;
-        private XElement _rootElement;
-
-        private bool _isInitialized;
-        private CancellationToken _cancellationToken;
-
-        /// <summary>
-        /// A <see cref="IDataWriter"/> that writes to an xml file
-        /// </summary>
-        /// <param name="path">The path to the xml file</param>
-        /// <param name="rootElementName">The root element name of the xml file</param>
-        public XmlDataWriter(string path, string rootElementName)
-        {
-            _rootElementName = rootElementName;
-            _file = File.Open(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.Read);
-        }
-
         /// <summary>
         /// Initialize the <see cref="XmlDataWriter"/>
         /// </summary>
+        /// <param name="file"></param>
+        /// <param name="rootElementName"></param>
         /// <param name="cancellationToken">A <see cref="CancellationToken"/> to cancel the async operation</param>
         /// <returns>Returns true if successful, false if not</returns>
         /// <exception cref="Exception">No root element found</exception>
-        public async Task<bool> Init(CancellationToken cancellationToken)
+        public async Task InitFile(FileStream file, string rootElementName, CancellationToken cancellationToken)
         {
-            if (_isInitialized)
-                return false;
+            //if the xml file isn't empty, return
+            if (file.Length > 3) //> 3 because of BOM
+                return;
             
-            _cancellationToken = cancellationToken;
-            //if the xml file is empty, write the root element
-            if (_file.Length <= 3) //<= 3 because of BOM
-            {
-                _xmlDocument = new XDocument();
-                _xmlDocument.Add(new XElement(_rootElementName));
-                _file.Seek(0, SeekOrigin.Begin); //reset stream to it's beginning to be able to save it
-                await _xmlDocument.SaveAsync(_file, SaveOptions.OmitDuplicateNamespaces, cancellationToken);
-            }
-            else
-            {
-                _xmlDocument = await XDocument.LoadAsync(_file, LoadOptions.None, _cancellationToken);
+            XDocument xmlDocument = new XDocument();
+            xmlDocument.Add(new XElement(rootElementName));
+            file.Seek(0, SeekOrigin.Begin); //reset stream to it's beginning to be able to save it
+            await xmlDocument.SaveAsync(file, SaveOptions.OmitDuplicateNamespaces, cancellationToken);
         }
 
-            _rootElement = _xmlDocument.Root;//?.Element(_rootElementName);
-            if (_rootElement == null)
-                throw new Exception("No root element found.");
-
-            _isInitialized = true;
-            return true;
-        }
+        /// <summary>
+        /// Write the data of a property
+        /// </summary>
+        /// <typeparam name="T">The <see cref="Type"/></typeparam>
+        /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
+        /// <param name="propertyName">The name of the property</param>
+        /// <param name="value">The value of the property</param>
+        /// <param name="overwrite">If true an existing value is overwritten, if false an additional value is added</param>
+        /// <param name="cancellationToken"></param>
+        /// <returns>A <see cref="Task"/> to await</returns>
+        public async Task Write<T, TProperty>(FileStream file, string propertyName, string value, bool overwrite, CancellationToken cancellationToken) => 
+            await Write<T>(file, propertyName, value, typeof(TProperty), overwrite, cancellationToken);
 
         /// <summary>
         /// Write the data of a property
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> that implements the property</typeparam>
-        /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
         /// <param name="propertyName">The name of the property</param>
         /// <param name="value">The value of the property</param>
+        /// <param name="propertyType"></param>
         /// <param name="overwrite">If true an existing value is overwritten, if false an additional value is added</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>A <see cref="Task"/> to await</returns>
         /// <exception cref="ArgumentNullException"><paramref name="propertyName"/></exception>
-        public async Task Write<T, TProperty>(string propertyName, string value, bool overwrite)
+        /// <exception cref="InvalidXmlFileException">No root element is set</exception>
+        public async Task Write<T>(FileStream file, string propertyName, string value, Type propertyType, bool overwrite, CancellationToken cancellationToken)
         {
             string typeName = typeof(T).FullName;
             if (typeName == null)
                 throw new ArgumentNullException(nameof(typeName));
             
-            _file.Seek(0, SeekOrigin.Begin); //reset stream to it's beginning to be able to save it
+            file.Seek(0, SeekOrigin.Begin); //reset stream to it's beginning to be able to load it
+            XDocument xmlDocument = await XDocument.LoadAsync(file, LoadOptions.None, cancellationToken);
+            file.Seek(0, SeekOrigin.Begin); //reset stream to it's beginning to be able to save it
 
-            XElement typeElement = _rootElement.Element(typeName);
-            if (typeElement != null) //type element already exists
-            {
-                XElement propertyElement = typeElement.Element(propertyName);
+            XElement rootElement = xmlDocument.Root;
+            if (rootElement == null)
+                throw new InvalidXmlFileException("No root element is set.");
+            
+            XElement propertyElement = rootElement.Element(propertyName);
             if (propertyElement != null) //property element already exists
             {
                 XElement valueElement = propertyElement.Element(XmlDataHandler.VALUE_ELEMENT_NAME);
@@ -112,21 +100,13 @@ namespace GBase.DataHandling
             else //property element doesn't exist
             {
                 propertyElement = new XElement(propertyName, new XElement(XmlDataHandler.VALUE_ELEMENT_NAME) { Value = value }); //create the new property element with the value element
-                    propertyElement.SetAttributeValue(XmlDataHandler.VALUE_TYPE_ATTRIBUTE_NAME, typeof(TProperty).FullName); //add the property type attribute
+                propertyElement.SetAttributeValue(XmlDataHandler.VALUE_TYPE_ATTRIBUTE_NAME, propertyType.FullName); //add the property type attribute
 
-                    typeElement.Add(propertyElement); //create new property element with the value element
-                }
-            }
-            else //type element doesn't exist
-            {
-                XElement propertyElement = new XElement(propertyName, new XElement(XmlDataHandler.VALUE_ELEMENT_NAME) { Value = value }); //create the new property element with the value element
-                propertyElement.SetAttributeValue(XmlDataHandler.VALUE_TYPE_ATTRIBUTE_NAME, typeof(TProperty).FullName); //add the property type attribute
-
-                _rootElement.Add(new XElement(typeName, propertyElement)); //create a new type element with the new property element
+                rootElement.Add(propertyElement); //create new property element with the value element
             }
 
             //TODO: check if whole file is overwritten (probably) -> performance issues for large files?
-            await _xmlDocument.SaveAsync(_file, SaveOptions.OmitDuplicateNamespaces, _cancellationToken); //save the document with the added elements
+            await xmlDocument.SaveAsync(file, SaveOptions.OmitDuplicateNamespaces, cancellationToken); //save the document with the added elements
         }
 
         /// <summary>
@@ -134,19 +114,27 @@ namespace GBase.DataHandling
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
         /// <param name="propertyName">The name of the property</param>
         /// <param name="value">The value to set</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>A <see cref="Task"/> to await</returns>
         /// <exception cref="ArgumentNullException"><paramref name="propertyName"/></exception>
-        public async Task Remove<T, TProperty>(string propertyName, string value)
+        /// <exception cref="InvalidXmlFileException">No root element is set</exception>
+        public async Task Remove<T, TProperty>(FileStream file, string propertyName, string value, CancellationToken cancellationToken)
         {
             string typeName = typeof(T).FullName;
             if (typeName == null)
                 throw new ArgumentNullException(nameof(typeName));
 
-            _file.Seek(0, SeekOrigin.Begin); //reset stream to it's beginning to be able to save it
+            XDocument xmlDocument = await XDocument.LoadAsync(file, LoadOptions.None, cancellationToken);
+            file.Seek(0, SeekOrigin.Begin); //reset stream to it's beginning to be able to save it
 
-            XElement typeElement = _rootElement.Element(typeName);
+            XElement rootElement = xmlDocument.Root;
+            if (rootElement == null)
+                throw new InvalidXmlFileException("No root element is set.");
+            
+            XElement typeElement = rootElement.Element(typeName);
             XElement propertyElement = typeElement?.Element(propertyName);
             XElement valueElement = propertyElement?.Elements(XmlDataHandler.VALUE_ELEMENT_NAME).FirstOrDefault(e => e.Value.Equals(value));
             if (valueElement == null)
@@ -155,17 +143,7 @@ namespace GBase.DataHandling
             valueElement.Remove();
 
             //TODO: check if whole file is overwritten (probably) -> performance issues for large files?
-            await _xmlDocument.SaveAsync(_file, SaveOptions.OmitDuplicateNamespaces, _cancellationToken); //save the document with the added elements
-        }
-
-        /// <summary>
-        /// Dispose used resources asynchronously
-        /// </summary>
-        /// <returns>A <see cref="ValueTask"/> to await</returns>
-        public async ValueTask DisposeAsync()
-        {
-            await _xmlDocument.SaveAsync(_file, SaveOptions.None, _cancellationToken);
-            await _file.DisposeAsync();
+            await xmlDocument.SaveAsync(file, SaveOptions.OmitDuplicateNamespaces, cancellationToken); //save the document with the added elements
         }
     }
 }

GBase/Exceptions/GenericMethodNotFoundException.cs

@@ -0,0 +1,24 @@
+// Author: Gockner, Simon
+// Created: 2020-11-13
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace GBase.Exceptions
+{
+    /// <summary>
+    /// Could not find generic method
+    /// </summary>
+    internal class GenericMethodNotFoundException : Exception
+    {
+        /// <summary>
+        /// Could not find generic method
+        /// </summary>
+        /// <param name="functionName">The name of the generic method</param>
+        public GenericMethodNotFoundException(string functionName)
+            : base($"Could not find function {functionName}")
+        {
+            
+        }
+    }
+}

GBase/Exceptions/InvalidKeyException.cs

@@ -0,0 +1,17 @@
+// Author: Gockner, Simon
+// Created: 2020-11-13
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace GBase.Exceptions
+{
+    public class InvalidKeyException : Exception
+    {
+        public InvalidKeyException(string message)
+            : base(message)
+        {
+            
+        }
+    }
+}

GBase/Exceptions/InvalidTableTypeException.cs

@@ -0,0 +1,27 @@
+// Author: Simon Gockner
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+using GBase.Interfaces;
+
+namespace GBase.Exceptions
+{
+    /// <summary>
+    /// <see cref="Exception"/> that the passed table type doesn't implement <see cref="IGBaseObject"/>"/>
+    /// </summary>
+    public class InvalidTableTypeException : Exception
+    {
+        /// <summary>
+        /// <see cref="Exception"/> that the passed table type doesn't implement <see cref="IGBaseObject"/>"/>
+        /// </summary>
+        /// <param name="type">The table type</param>
+        public InvalidTableTypeException(Type type)
+            : base($"Table type ({type}) doesn't implement {nameof(IGBaseObject)}.")
+        {
+            Type = type;
+        }
+        
+        public Type Type { get; }
+    }
+}

GBase/Exceptions/MissingKeyColumnException.cs

@@ -0,0 +1,17 @@
+// Author: Gockner, Simon
+// Created: 2020-11-13
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace GBase.Exceptions
+{
+    public class MissingKeyColumnException<T> : Exception
+    {
+        public MissingKeyColumnException()
+            : base($"Type {typeof(T)} is missing a key column.")
+        {
+            
+        }
+    }
+}

GBase/Exceptions/MissingTableException.cs

@@ -0,0 +1,23 @@
+// Author: Gockner, Simon
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace GBase.Exceptions
+{
+    /// <summary>
+    /// <see cref="Exception"/> that the table for the given <see cref="Type"/> is missing
+    /// </summary>
+    public class MissingTableException<T> : Exception
+    {
+        /// <summary>
+        /// <see cref="Exception"/> that the table for the given <see cref="Type"/> is missing
+        /// </summary>
+        public MissingTableException()
+            : base($"There is no table for type {typeof(T)}.")
+        {
+            
+        }
+    }
+}

GBase/Factories/GBaseTableFactory.cs

@@ -0,0 +1,49 @@
+// Author: Simon Gockner
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+using GBase.Exceptions;
+using GBase.FileHandling.Factories;
+using GBase.Interfaces;
+using GBase.Interfaces.DataHandling.Pool;
+using GBase.Interfaces.FileHandling;
+
+namespace GBase.Factories
+{
+    /// <summary>
+    /// Factory for the <see cref="IGBaseTable"/>
+    /// </summary>
+    public class GBaseTableFactory : IGBaseTableFactory
+    {
+        private readonly IFileHandlerFactory _fileHandlerFactory;
+        private readonly IDataHandlerPool _dataHandlerPool;
+        private readonly IGBaseColumnFactory _gBaseColumnFactory;
+
+        /// <summary>
+        /// Factory for the <see cref="IGBaseTable"/>
+        /// </summary>
+        /// <param name="fileHandlerFactory">Factory for the <see cref="IFileHandler"/></param>
+        /// <param name="dataHandlerPool"></param>
+        /// <param name="gBaseColumnFactory">Factory for the <see cref="IGBaseColumn"/></param>
+        public GBaseTableFactory(IFileHandlerFactory fileHandlerFactory, IDataHandlerPool dataHandlerPool, IGBaseColumnFactory gBaseColumnFactory)
+        {
+            _fileHandlerFactory = fileHandlerFactory;
+            _dataHandlerPool = dataHandlerPool;
+            _gBaseColumnFactory = gBaseColumnFactory;
+        }
+
+        /// <summary>
+        /// Creates an <see cref="IGBaseTable"/>
+        /// </summary>
+        /// <returns>A newly created instance of the implementation for <see cref="IGBaseTable"/></returns>
+        public IGBaseTable Create(Type type)
+        {
+            if (!typeof(IGBaseObject).IsAssignableFrom(type))
+                throw new InvalidTableTypeException(type);
+            
+            Type gBaseTableType = typeof(GBaseTable<>).MakeGenericType(type);
+            return (IGBaseTable) Activator.CreateInstance(gBaseTableType, _fileHandlerFactory, _dataHandlerPool, _gBaseColumnFactory);
+        }
+    }
+}

GBase/Factories/IGBaseColumnFactory.cs

@@ -3,6 +3,7 @@
 // Copyright(c) 2020 SimonG. All Rights Reserved.
 
 
+using System;
 using GBase.Interfaces;
 
 namespace GBase.Factories
@@ -16,6 +17,6 @@ namespace GBase.Factories
         /// Creates an <see cref="IGBaseColumn"/>
         /// </summary>
         /// <returns>A newly created instance of the implementation for <see cref="IGBaseColumn"/></returns>
-        IGBaseColumn Create();
+        IGBaseColumn Create(string name, Type type, bool isKey);
     }
 }

GBase/Factories/IGBaseTableFactory.cs

@@ -3,6 +3,7 @@
 // Copyright(c) 2020 SimonG. All Rights Reserved.
 
 
+using System;
 using GBase.Interfaces;
 
 namespace GBase.Factories
@@ -16,6 +17,6 @@ namespace GBase.Factories
         /// Creates an <see cref="IGBaseTable"/>
         /// </summary>
         /// <returns>A newly created instance of the implementation for <see cref="IGBaseTable"/></returns>
-        IGBaseTable Create();
+        IGBaseTable Create(Type type);
     }
 }

GBase/FileHandling/Exceptions/FileNotExistingException.cs

@@ -0,0 +1,17 @@
+// Author: Gockner, Simon
+// Created: 2020-11-10
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace GBase.FileHandling.Exceptions
+{
+    public class FileNotExistingException<T> : Exception
+    {
+        public FileNotExistingException()
+            : base($"File for the given type {typeof(T)} is not existing.")
+        {
+            
+        }
+    }
+}

GBase/FileHandling/FileHandler.cs

@@ -2,13 +2,13 @@
 // Created: 2020-02-12
 // Copyright(c) 2020 SimonG. All Rights Reserved.
 
-using System;
 using System.Collections.Generic;
+using System.IO;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
-using GBase.DataHandling.Factories;
-using GBase.Interfaces.DataHandling;
-using GBase.Interfaces.DataHandling.Xml;
+using GBase.FileHandling.Exceptions;
+using GBase.Interfaces;
 using GBase.Interfaces.FileHandling;
 
 namespace GBase.FileHandling
@@ -18,84 +18,91 @@ namespace GBase.FileHandling
     /// </summary>
     public class FileHandler : IFileHandler
     {
-        private readonly IXmlDataHandlerFactory _dataHandlerFactory;
+        /// <summary>
+        /// The file extension for all GBase tables 
+        /// </summary>
+        public const string GBASE_TABLE_FILE_EXTENSION = "gb";
+        
+        private readonly List<IGBaseFile> _files;
+        private string _path;
         
         /// <summary>
         /// Internal file handler
         /// </summary>
-        /// <param name="xmlDataHandlerFactory">Factory for the <see cref="IXmlDataHandler"/></param>
-        public FileHandler(IXmlDataHandlerFactory xmlDataHandlerFactory)
+        public FileHandler()
         {
-            _dataHandlerFactory = xmlDataHandlerFactory;
+            _files = new List<IGBaseFile>();
         }
 
-        /// <summary>
-        /// The <see cref="IDataHandler"/> of this <see cref="IFileHandler"/>
-        /// </summary>
-        private IDataHandler DataHandler { get; set; }
-
         /// <summary>
         /// Initialize this <see cref="IFileHandler"/>
         /// </summary>
         /// <param name="path">The path of the database</param>
+        /// <param name="folderName"></param>
         /// <param name="cancellationToken">A <see cref="CancellationToken"/> to cancel the asynchronous operation</param>
         /// <returns>True if successful, false if not</returns>
-        public async Task<bool> Init(string path, CancellationToken cancellationToken)
+        public List<IGBaseFile> Init(string path, string folderName, CancellationToken cancellationToken)
         {
-            DataHandler = _dataHandlerFactory.Create();
+            _path = path;
             
-            bool success = await DataHandler.Init(false, cancellationToken);
-            return success;
-        }
+            string directoryPath = Path.Combine(_path, folderName);
+            if (!Directory.Exists(directoryPath))
+                return null;
             
-        /// <summary>
-        /// Set the value for the given property
-        /// </summary>
-        /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
-        /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
-        /// <param name="propertyName">The name of the property</param>
-        /// <param name="value">The value to set</param>
-        /// <returns>A <see cref="Task"/> to await</returns>
-        public async Task SetValue<T, TProperty>(string propertyName, TProperty value)
+            string[] files = Directory.GetFiles(directoryPath, $"*.{GBASE_TABLE_FILE_EXTENSION}");
+
+            foreach (var file in files)
             {
-            await DataHandler.SetValue<T, TProperty>(propertyName, value);
+                FileStream entryFile = File.Open(file, FileMode.OpenOrCreate, FileAccess.ReadWrite);
+                _files.Add(new GBaseFile(null, entryFile, file));
             }
             
-        /// <summary>
-        /// Remove the value for the given property
-        /// </summary>
-        /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
-        /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
-        /// <param name="propertyName">The name of the property</param>
-        /// <param name="value">The value to set</param>
-        /// <returns>A <see cref="Task"/> to await</returns>
-        public async Task RemoveValue<T, TProperty>(string propertyName, TProperty value)
+            return _files;
+        }
+
+        public IGBaseFile CreateEntryFile<T>(T entry, IGBaseTable table) where T : IGBaseObject
         {
-            await DataHandler.RemoveValue<T, TProperty>(propertyName, value);
+            string directoryPath = Path.Combine(_path, table.FolderName);
+            
+            //create directory if it doesn't exist
+            Directory.CreateDirectory(directoryPath);
+            
+            //create new entry file
+            string filePath = $"{Path.Combine(directoryPath, entry.FileName)}.{GBASE_TABLE_FILE_EXTENSION}";
+
+            //check if file is already opened
+            IGBaseFile file = _files.FirstOrDefault(f => f.FilePath.Equals(filePath));
+            if (file != null) 
+                return file.UseFile();
+            
+            FileStream entryFile = File.Open(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
+            file = new GBaseFile(entry, entryFile, filePath);
+            _files.Add(file);
+
+            return file.UseFile();
         }
 
-        /// <summary>
-        /// Get the value for the given property, if multiple values are set the first is returned
-        /// </summary>
-        /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
-        /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
-        /// <param name="propertyName">The name of the property</param>
-        /// <returns>The value for the given property</returns>
-        public async Task<TProperty> GetValue<T, TProperty>(string propertyName)
+        public async Task<bool> DeleteEntryFile<T>(T entry)
         {
-            return await DataHandler.GetValue<T, TProperty>(propertyName);
+            IGBaseFile file = _files.FirstOrDefault(f => f.Entry.Equals(entry));
+            if (file == default)
+                return false;
+
+            await file.File.DisposeAsync();
+            File.Delete(file.FilePath);
+            return true;
         }
 
-        /// <summary>
-        /// Get all the values that are set for the given property
-        /// </summary>
-        /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
-        /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
-        /// <param name="propertyName">The name of the property</param>
-        /// <returns>An <see cref="IEnumerable{T}"/> with all the values for the property</returns>
-        public async Task<IEnumerable<TProperty>> GetValues<T, TProperty>(string propertyName)
+        public async Task<IGBaseFile> RequestEntryFile<T>(T entry)
         {
-            return await DataHandler.GetValues<T, TProperty>(propertyName);
+            IGBaseFile file = _files.FirstOrDefault(f => f.Entry.Equals(entry));
+            if (file == default)
+                throw new FileNotExistingException<T>();
+
+            if (file.InUse)
+                await Task.Delay(1000);
+
+            return file.UseFile();
         }
 
         /// <summary>
@@ -104,7 +111,15 @@ namespace GBase.FileHandling
         /// <returns>A <see cref="ValueTask"/> to await</returns>
         public async ValueTask DisposeAsync()
         {
-            await DataHandler.DisposeAsync();
+            while (_files.Any(f => f.InUse))
+            {
+                await Task.Delay(1000);
+            }
+
+            foreach (var file in _files)
+            {
+                await file.File.DisposeAsync();
+            }
         }
     }
 }

GBase/FileHandling/GBaseFile.cs

@@ -0,0 +1,32 @@
+// Author: Gockner, Simon
+// Created: 2020-11-10
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System.IO;
+using GBase.Interfaces.FileHandling;
+
+namespace GBase.FileHandling
+{
+    public class GBaseFile : IGBaseFile
+    {
+        public GBaseFile(object entry, FileStream file, string filePath)
+        {
+            Entry = entry;
+            File = file;
+            FilePath = filePath;
+        }
+
+        public object Entry { get; set; }
+        public FileStream File { get; }
+        public string FilePath { get; }
+        public bool InUse { get; private set; }
+
+        public IGBaseFile UseFile()
+        {
+            InUse = true;
+            return this;
+        }
+
+        public void Dispose() => InUse = false;
+    }
+}

GBase/GBase.cs

@@ -9,6 +9,7 @@ using System.Reflection;
 using System.Threading;
 using System.Threading.Tasks;
 using GBase.Attributes;
+using GBase.Exceptions;
 using GBase.Factories;
 using GBase.Interfaces;
 using GBase.Interfaces.Settings;
@@ -20,11 +21,6 @@ namespace GBase
     /// </summary>
     public class GBase : IGBase
     {
-        /// <summary>
-        /// The file extension for all GBase tables 
-        /// </summary>
-        public const string GBASE_TABLE_FILE_EXTENSION = "gb"; //TODO: Find correct place for this const
-
         private readonly IGBaseTableFactory _gBaseTableFactory;
 
         /// <summary>
@@ -74,8 +70,8 @@ namespace GBase
                 if (gBaseTableAttribute == null)
                     continue;
 
-                IGBaseTable gBaseTable = _gBaseTableFactory.Create();
-                await gBaseTable.Init(type, type.Name, Settings.DatabasePath, cancellationToken);
+                IGBaseTable gBaseTable = _gBaseTableFactory.Create(type);
+                await gBaseTable.Init(type, Settings.DatabasePath, gBaseTableAttribute.FolderName, cancellationToken);
 
                 AddTable(gBaseTable);
             }
@@ -93,13 +89,21 @@ namespace GBase
             if (Tables.Contains(table))
                 return false;
 
-            if (Tables.Any(t => t.Name.Equals(table.Name)))
+            if (Tables.Any(t => t.FolderName.Equals(table.FolderName)))
                 return false;
 
             Tables.Add(table);
             return true;
         }
 
+        public IGBaseTable<T> GetTable<T>() where T : IGBaseObject, new()
+        {
+            if (Tables.OfType<IGBaseTable<T>>().Any())
+                return Tables.OfType<IGBaseTable<T>>().First();
+
+            throw new MissingTableException<T>();
+        }
+
         /// <summary>
         /// Removes a given <see cref="IGBaseTable"/> from this <see cref="GBase"/>
         /// </summary>
@@ -113,6 +117,52 @@ namespace GBase
             return Tables.Remove(table);
         }
 
+        public async Task<bool> AddEntry<T>(T entry, CancellationToken cancellationToken) where T : IGBaseObject, new()
+        {
+            IGBaseTable<T> table = GetTable<T>();
+            if (table == null)
+                throw new MissingTableException<T>();
+
+            return await table.AddEntry(entry, cancellationToken);
+        }
+        
+        public T GetEntryForKey<T>(int key) where T : IGBaseObject, new()
+        {
+            IGBaseTable<T> table = GetTable<T>();
+            if (table == null)
+                throw new MissingTableException<T>();
+
+            return table.GetEntryForKey(key);
+        }
+
+        public async Task SetValue<T, TProperty>(T entry, string propertyName, TProperty value, CancellationToken cancellationToken) where T : IGBaseObject, new()
+        {
+            IGBaseTable<T> table = GetTable<T>();
+            if (table == null)
+                throw new MissingTableException<T>();
+
+            await table.SetValue(entry, propertyName, value, cancellationToken);
+        }
+
+        public async Task<TProperty> GetValue<T, TProperty>(T entry, string propertyName, CancellationToken cancellationToken) where T : IGBaseObject, new()
+        {
+            IGBaseTable<T> table = GetTable<T>();
+            if (table == null)
+                throw new MissingTableException<T>();
+
+            return await table.GetValue<TProperty>(entry, propertyName, cancellationToken);
+        }
+
+        public async Task<IEnumerable<TProperty>> GetValues<T, TProperty>(T entry, string propertyName, CancellationToken cancellationToken) where T : IGBaseObject, new()
+        {
+            IGBaseTable<T> table = GetTable<T>();
+            if (table == null)
+                throw new MissingTableException<T>();
+            
+            return await table.GetValues<TProperty>(entry, propertyName, cancellationToken);
+        }
+
+
         /// <summary>
         /// Dispose used resources asynchronously
         /// </summary>

GBase/GBase.csproj

@@ -24,6 +24,7 @@
   <ItemGroup>
     <PackageReference Include="LightweightIocContainer" Version="2.1.0" />
     <PackageReference Include="Microsoft.CodeAnalysis" Version="3.5.0-beta2-final" />
+    <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
   </ItemGroup>
 
   <ItemGroup>

GBase/GBase.xml

@@ -87,13 +87,15 @@
             <param name="value">The value to set</param>
             <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
         </member>
-        <member name="M:GBase.DataHandling.Cache.XmlDataHandlerCache.TryGetValues``2(System.String)">
+        <member name="M:GBase.DataHandling.Cache.XmlDataHandlerCache.TryGetValues``2(System.IO.FileStream,System.String,System.Threading.CancellationToken)">
             <summary>
             Try to get values from the cache for the given property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/> that implements the property</typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="file"></param>
             <param name="propertyName">The name of the property</param>
+            <param name="cancellationToken"></param>
             <returns>An <see cref="T:System.Collections.Generic.IEnumerable`1"/> with all the values for the property</returns>
         </member>
         <member name="T:GBase.DataHandling.Cache.XmlDataHandlerCacheEntry">
@@ -163,11 +165,10 @@
             Factory for the <see cref="T:GBase.Interfaces.DataHandling.Xml.IXmlDataReader"/>
             </summary>
         </member>
-        <member name="M:GBase.DataHandling.Factories.IXmlDataReaderFactory.Create(System.String)">
+        <member name="M:GBase.DataHandling.Factories.IXmlDataReaderFactory.Create">
             <summary>
             Creates an <see cref="T:GBase.Interfaces.DataHandling.Xml.IXmlDataReader"/>
             </summary>
-            <param name="path">The path to the xml file</param>
             <returns>A newly created instance of the implementation for <see cref="T:GBase.Interfaces.DataHandling.Xml.IXmlDataReader"/></returns>
         </member>
         <member name="T:GBase.DataHandling.Factories.IXmlDataWriterFactory">
@@ -175,12 +176,10 @@
             Factory for the <see cref="T:GBase.Interfaces.DataHandling.Xml.IXmlDataWriter"/>
             </summary>
         </member>
-        <member name="M:GBase.DataHandling.Factories.IXmlDataWriterFactory.Create(System.String,System.String)">
+        <member name="M:GBase.DataHandling.Factories.IXmlDataWriterFactory.Create">
             <summary>
             Creates an <see cref="T:GBase.Interfaces.DataHandling.Xml.IXmlDataWriter"/>
             </summary>
-            <param name="path">The path to the xml file</param>
-            <param name="rootElementName">The root element name of the xml file</param>
             <returns>A newly created instance of the implementation for <see cref="T:GBase.Interfaces.DataHandling.Xml.IXmlDataWriter"/></returns>
         </member>
         <member name="T:GBase.DataHandling.XmlDataHandler">
@@ -198,152 +197,158 @@
             The attribute name of the value <see cref="T:System.Type"/> attribute
             </summary>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataHandler.#ctor(System.String,System.String,GBase.DataHandling.Factories.IXmlDataReaderFactory,GBase.DataHandling.Factories.IXmlDataWriterFactory,GBase.DataHandling.Cache.Factories.IXmlDataHandlerCacheFactory)">
+        <member name="M:GBase.DataHandling.XmlDataHandler.#ctor(GBase.DataHandling.Factories.IXmlDataReaderFactory,GBase.DataHandling.Factories.IXmlDataWriterFactory,GBase.DataHandling.Cache.Factories.IXmlDataHandlerCacheFactory)">
             <summary>
             A <see cref="T:GBase.Interfaces.DataHandling.IDataHandler"/> that handles its data in an xml file
             </summary>
-            <param name="path">The path to the xml file</param>
-            <param name="rootElementName">The root element name of the xml file</param>
             <param name="xmlDataReaderFactory">The <see cref="T:GBase.Interfaces.DataHandling.Xml.IXmlDataReader"/> factory</param>
             <param name="xmlDataWriterFactory">The <see cref="T:GBase.Interfaces.DataHandling.Xml.IXmlDataWriter"/> factory</param>
             <param name="xmlDataHandlerCacheFactory">The <see cref="T:GBase.Interfaces.DataHandling.Xml.Cache.IXmlDataHandlerCache"/> factory</param>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataHandler.Init(System.Boolean,System.Threading.CancellationToken)">
+        <member name="M:GBase.DataHandling.XmlDataHandler.Init(System.Boolean)">
             <summary>
             Initialize the <see cref="T:GBase.DataHandling.XmlDataHandler"/>
             </summary>
             <param name="overwrite">If true an existing value is overwritten, if false an additional value is added</param>
-            <param name="cancellationToken">A <see cref="T:System.Threading.CancellationToken"/> to cancel the async operation</param>
             <returns>Returns true if successful, false if not</returns>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataHandler.SetValue``2(System.String,``1)">
+        <member name="M:GBase.DataHandling.XmlDataHandler.SetValue``2(System.IO.FileStream,System.String,``1,System.Threading.CancellationToken)">
             <summary>
             Set the value for the given property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/> that implements the property</typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="entryFile"></param>
             <param name="propertyName">The name of the property</param>
             <param name="value">The value to set</param>
+            <param name="cancellationToken"></param>
             <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataHandler.RemoveValue``2(System.String,``1)">
+        <member name="M:GBase.DataHandling.XmlDataHandler.RemoveValue``2(System.IO.FileStream,System.String,``1,System.Threading.CancellationToken)">
             <summary>
             Remove the value for the given property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="entryFile"></param>
             <param name="propertyName">The name of the property</param>
             <param name="value">The value to set</param>
+            <param name="cancellationToken"></param>
             <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataHandler.GetValue``2(System.String)">
+        <member name="M:GBase.DataHandling.XmlDataHandler.GetValue``2(System.IO.FileStream,System.String,System.Threading.CancellationToken)">
             <summary>
             Get the value for the given property, if multiple values are set the first is returned
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/> that implements the property</typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="file"></param>
             <param name="propertyName">The name of the property</param>
+            <param name="cancellationToken"></param>
             <returns>The value for the given property</returns>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataHandler.GetValues``2(System.String)">
+        <member name="M:GBase.DataHandling.XmlDataHandler.GetValues``2(System.IO.FileStream,System.String,System.Threading.CancellationToken)">
             <summary>
             Get all the values that are set for the given property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/> that implements the property</typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="file"></param>
             <param name="propertyName">The name of the property</param>
+            <param name="cancellationToken"></param>
             <returns>An <see cref="T:System.Collections.Generic.IEnumerable`1"/> with all the values for the property</returns>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataHandler.DisposeAsync">
-            <summary>
-            Dispose used resources asynchronously
-            </summary>
-            <returns>A <see cref="T:System.Threading.Tasks.ValueTask"/> to await</returns>
-        </member>
         <member name="T:GBase.DataHandling.XmlDataReader">
             <summary>
-            A <see cref="T:GBase.Interfaces.DataHandling.IDataReader"/> that reads from a xml file
-            </summary>
-        </member>
-        <member name="M:GBase.DataHandling.XmlDataReader.#ctor(System.String)">
-            <summary>
-            A <see cref="T:GBase.Interfaces.DataHandling.IDataReader"/> that reads from a xml file
+            An <see cref="T:GBase.Interfaces.DataHandling.IDataReader"/> that reads from a xml file
             </summary>
-            <param name="path">The path to the xml file</param>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataReader.Init(System.Threading.CancellationToken)">
+        <member name="M:GBase.DataHandling.XmlDataReader.#ctor(GBase.Interfaces.IGBase)">
             <summary>
-            Initialize the <see cref="T:GBase.DataHandling.XmlDataReader"/>
+            An <see cref="T:GBase.Interfaces.DataHandling.IDataReader"/> that reads from a xml file
             </summary>
-            <param name="cancellationToken">A <see cref="T:System.Threading.CancellationToken"/> to cancel the async operation</param>
-            <returns>Returns true if successful, false if not</returns>
-            <exception cref="T:System.Exception">No root element found</exception>
+            <param name="gBase">The <see cref="T:GBase.Interfaces.IGBase"/></param>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataReader.Read``2(System.String)">
+        <member name="M:GBase.DataHandling.XmlDataReader.Read``2(System.IO.FileStream,System.String,System.Threading.CancellationToken)">
             <summary>
             Read the data of a property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/></typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="file"></param>
             <param name="propertyName">The name of the property</param>
+            <param name="cancellationToken"></param>
             <returns>The data of the given property, null if no data found</returns>
             <exception cref="T:System.ArgumentNullException"><paramref name="propertyName"/></exception>
             <exception cref="T:System.InvalidOperationException">Invalid <see cref="T:System.Type"/> found for the read object</exception>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataReader.DisposeAsync">
-            <summary>
-            Dispose used resources asynchronously
-            </summary>
-            <returns>A <see cref="T:System.Threading.Tasks.ValueTask"/> to await</returns>
-        </member>
         <member name="T:GBase.DataHandling.XmlDataWriter">
             <summary>
             A <see cref="T:GBase.Interfaces.DataHandling.IDataWriter"/> that writes to a xml file
             </summary>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataWriter.#ctor(System.String,System.String)">
-            <summary>
-            A <see cref="T:GBase.Interfaces.DataHandling.IDataWriter"/> that writes to an xml file
-            </summary>
-            <param name="path">The path to the xml file</param>
-            <param name="rootElementName">The root element name of the xml file</param>
-        </member>
-        <member name="M:GBase.DataHandling.XmlDataWriter.Init(System.Threading.CancellationToken)">
+        <member name="M:GBase.DataHandling.XmlDataWriter.InitFile(System.IO.FileStream,System.String,System.Threading.CancellationToken)">
             <summary>
             Initialize the <see cref="T:GBase.DataHandling.XmlDataWriter"/>
             </summary>
+            <param name="file"></param>
+            <param name="rootElementName"></param>
             <param name="cancellationToken">A <see cref="T:System.Threading.CancellationToken"/> to cancel the async operation</param>
             <returns>Returns true if successful, false if not</returns>
             <exception cref="T:System.Exception">No root element found</exception>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataWriter.Write``2(System.String,System.String,System.Boolean)">
+        <member name="M:GBase.DataHandling.XmlDataWriter.Write``2(System.IO.FileStream,System.String,System.String,System.Boolean,System.Threading.CancellationToken)">
             <summary>
             Write the data of a property
             </summary>
-            <typeparam name="T">The <see cref="T:System.Type"/> that implements the property</typeparam>
+            <typeparam name="T">The <see cref="T:System.Type"/></typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="file"></param>
             <param name="propertyName">The name of the property</param>
             <param name="value">The value of the property</param>
             <param name="overwrite">If true an existing value is overwritten, if false an additional value is added</param>
+            <param name="cancellationToken"></param>
+            <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
+        </member>
+        <member name="M:GBase.DataHandling.XmlDataWriter.Write``1(System.IO.FileStream,System.String,System.String,System.Type,System.Boolean,System.Threading.CancellationToken)">
+            <summary>
+            Write the data of a property
+            </summary>
+            <typeparam name="T">The <see cref="T:System.Type"/> that implements the property</typeparam>
+            <param name="file"></param>
+            <param name="propertyName">The name of the property</param>
+            <param name="value">The value of the property</param>
+            <param name="propertyType"></param>
+            <param name="overwrite">If true an existing value is overwritten, if false an additional value is added</param>
+            <param name="cancellationToken"></param>
             <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
             <exception cref="T:System.ArgumentNullException"><paramref name="propertyName"/></exception>
+            <exception cref="T:GBase.DataHandling.Exceptions.InvalidXmlFileException">No root element is set</exception>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataWriter.Remove``2(System.String,System.String)">
+        <member name="M:GBase.DataHandling.XmlDataWriter.Remove``2(System.IO.FileStream,System.String,System.String,System.Threading.CancellationToken)">
             <summary>
             Remove the value for the given property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="file"></param>
             <param name="propertyName">The name of the property</param>
             <param name="value">The value to set</param>
+            <param name="cancellationToken"></param>
             <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
             <exception cref="T:System.ArgumentNullException"><paramref name="propertyName"/></exception>
+            <exception cref="T:GBase.DataHandling.Exceptions.InvalidXmlFileException">No root element is set</exception>
         </member>
-        <member name="M:GBase.DataHandling.XmlDataWriter.DisposeAsync">
+        <member name="T:GBase.Exceptions.GenericMethodNotFoundException">
             <summary>
-            Dispose used resources asynchronously
+            Could not find generic method
             </summary>
-            <returns>A <see cref="T:System.Threading.Tasks.ValueTask"/> to await</returns>
+        </member>
+        <member name="M:GBase.Exceptions.GenericMethodNotFoundException.#ctor(System.String)">
+            <summary>
+            Could not find generic method
+            </summary>
+            <param name="functionName">The name of the generic method</param>
         </member>
         <member name="T:GBase.Exceptions.InterfaceEnumerablePassedException">
             <summary>
@@ -361,12 +366,52 @@
             The <see cref="T:System.Type"/> of the passed interface
             </summary>
         </member>
+        <member name="T:GBase.Exceptions.InvalidTableTypeException">
+            <summary>
+            <see cref="T:System.Exception"/> that the passed table type doesn't implement <see cref="T:GBase.Interfaces.IGBaseObject"/>"/>
+            </summary>
+        </member>
+        <member name="M:GBase.Exceptions.InvalidTableTypeException.#ctor(System.Type)">
+            <summary>
+            <see cref="T:System.Exception"/> that the passed table type doesn't implement <see cref="T:GBase.Interfaces.IGBaseObject"/>"/>
+            </summary>
+            <param name="type">The table type</param>
+        </member>
+        <member name="T:GBase.Exceptions.MissingTableException`1">
+            <summary>
+            <see cref="T:System.Exception"/> that the table for the given <see cref="T:System.Type"/> is missing
+            </summary>
+        </member>
+        <member name="M:GBase.Exceptions.MissingTableException`1.#ctor">
+            <summary>
+            <see cref="T:System.Exception"/> that the table for the given <see cref="T:System.Type"/> is missing
+            </summary>
+        </member>
+        <member name="T:GBase.Factories.GBaseTableFactory">
+            <summary>
+            Factory for the <see cref="T:GBase.Interfaces.IGBaseTable"/>
+            </summary>
+        </member>
+        <member name="M:GBase.Factories.GBaseTableFactory.#ctor(GBase.FileHandling.Factories.IFileHandlerFactory,GBase.Interfaces.DataHandling.Pool.IDataHandlerPool,GBase.Factories.IGBaseColumnFactory)">
+            <summary>
+            Factory for the <see cref="T:GBase.Interfaces.IGBaseTable"/>
+            </summary>
+            <param name="fileHandlerFactory">Factory for the <see cref="T:GBase.Interfaces.FileHandling.IFileHandler"/></param>
+            <param name="dataHandlerPool"></param>
+            <param name="gBaseColumnFactory">Factory for the <see cref="T:GBase.Interfaces.IGBaseColumn"/></param>
+        </member>
+        <member name="M:GBase.Factories.GBaseTableFactory.Create(System.Type)">
+            <summary>
+            Creates an <see cref="T:GBase.Interfaces.IGBaseTable"/>
+            </summary>
+            <returns>A newly created instance of the implementation for <see cref="T:GBase.Interfaces.IGBaseTable"/></returns>
+        </member>
         <member name="T:GBase.Factories.IGBaseColumnFactory">
             <summary>
             Factory for the <see cref="T:GBase.Interfaces.IGBaseColumn"/>
             </summary>
         </member>
-        <member name="M:GBase.Factories.IGBaseColumnFactory.Create">
+        <member name="M:GBase.Factories.IGBaseColumnFactory.Create(System.String,System.Type,System.Boolean)">
             <summary>
             Creates an <see cref="T:GBase.Interfaces.IGBaseColumn"/>
             </summary>
@@ -389,7 +434,7 @@
             Factory for the <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
         </member>
-        <member name="M:GBase.Factories.IGBaseTableFactory.Create">
+        <member name="M:GBase.Factories.IGBaseTableFactory.Create(System.Type)">
             <summary>
             Creates an <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
@@ -411,63 +456,25 @@
             Internal file handler
             </summary>
         </member>
-        <member name="M:GBase.FileHandling.FileHandler.#ctor(GBase.DataHandling.Factories.IXmlDataHandlerFactory)">
+        <member name="F:GBase.FileHandling.FileHandler.GBASE_TABLE_FILE_EXTENSION">
             <summary>
-            Internal file handler
+            The file extension for all GBase tables 
             </summary>
-            <param name="xmlDataHandlerFactory">Factory for the <see cref="T:GBase.Interfaces.DataHandling.Xml.IXmlDataHandler"/></param>
         </member>
-        <member name="P:GBase.FileHandling.FileHandler.DataHandler">
+        <member name="M:GBase.FileHandling.FileHandler.#ctor">
             <summary>
-            The <see cref="T:GBase.Interfaces.DataHandling.IDataHandler"/> of this <see cref="T:GBase.Interfaces.FileHandling.IFileHandler"/>
+            Internal file handler
             </summary>
         </member>
-        <member name="M:GBase.FileHandling.FileHandler.Init(System.String,System.Threading.CancellationToken)">
+        <member name="M:GBase.FileHandling.FileHandler.Init(System.String,System.String,System.Threading.CancellationToken)">
             <summary>
             Initialize this <see cref="T:GBase.Interfaces.FileHandling.IFileHandler"/>
             </summary>
             <param name="path">The path of the database</param>
+            <param name="folderName"></param>
             <param name="cancellationToken">A <see cref="T:System.Threading.CancellationToken"/> to cancel the asynchronous operation</param>
             <returns>True if successful, false if not</returns>
         </member>
-        <member name="M:GBase.FileHandling.FileHandler.SetValue``2(System.String,``1)">
-            <summary>
-            Set the value for the given property
-            </summary>
-            <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
-            <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
-            <param name="propertyName">The name of the property</param>
-            <param name="value">The value to set</param>
-            <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
-        </member>
-        <member name="M:GBase.FileHandling.FileHandler.RemoveValue``2(System.String,``1)">
-            <summary>
-            Remove the value for the given property
-            </summary>
-            <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
-            <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
-            <param name="propertyName">The name of the property</param>
-            <param name="value">The value to set</param>
-            <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
-        </member>
-        <member name="M:GBase.FileHandling.FileHandler.GetValue``2(System.String)">
-            <summary>
-            Get the value for the given property, if multiple values are set the first is returned
-            </summary>
-            <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
-            <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
-            <param name="propertyName">The name of the property</param>
-            <returns>The value for the given property</returns>
-        </member>
-        <member name="M:GBase.FileHandling.FileHandler.GetValues``2(System.String)">
-            <summary>
-            Get all the values that are set for the given property
-            </summary>
-            <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
-            <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
-            <param name="propertyName">The name of the property</param>
-            <returns>An <see cref="T:System.Collections.Generic.IEnumerable`1"/> with all the values for the property</returns>
-        </member>
         <member name="M:GBase.FileHandling.FileHandler.DisposeAsync">
             <summary>
             Dispose used resources asynchronously
@@ -479,11 +486,6 @@
             The base class of the GBase database
             </summary>
         </member>
-        <member name="F:GBase.GBase.GBASE_TABLE_FILE_EXTENSION">
-            <summary>
-            The file extension for all GBase tables 
-            </summary>
-        </member>
         <member name="M:GBase.GBase.#ctor(GBase.Interfaces.Settings.IGBaseSettings,GBase.Factories.IGBaseTableFactory)">
             <summary>
             The base class of the GBase database
@@ -540,7 +542,7 @@
             A column of a <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
         </member>
-        <member name="M:GBase.GBaseColumn.#ctor">
+        <member name="M:GBase.GBaseColumn.#ctor(System.String,System.Type,System.Boolean)">
             <summary>
             A column of a <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
@@ -551,91 +553,96 @@
             </summary>
             <returns>A <see cref="T:System.Threading.Tasks.ValueTask"/> to await</returns>
         </member>
-        <member name="T:GBase.GBaseTable">
+        <member name="T:GBase.GBaseObject`1">
+            <summary>
+            GBase object that supplies inheriting classes with methods to get data from a <see cref="T:GBase.Interfaces.IGBase"/>
+            </summary>
+        </member>
+        <member name="M:GBase.GBaseObject`1.#ctor(GBase.Interfaces.IGBase)">
+            <summary>
+            GBase object that allows conversion from <see cref="T:System.String"/>
+            </summary>
+            <exception cref="T:GBase.Exceptions.MissingTableException`1">No table for <typeparamref name="T"/> is existing</exception>
+        </member>
+        <member name="M:GBase.GBaseObject`1.InitializeFromString(System.String)">
+            <summary>
+            Initialize this <see cref="T:GBase.GBaseObject`1"/> from a given <see cref="T:System.String"/>
+            </summary>
+            <param name="string">The given <see cref="T:System.String"/></param>
+        </member>
+        <member name="T:GBase.GBaseTable`1">
             <summary>
             A <see cref="T:GBase.Interfaces.IGBase"/> table
             </summary>
         </member>
-        <member name="M:GBase.GBaseTable.#ctor(GBase.FileHandling.Factories.IFileHandlerFactory,GBase.Factories.IGBaseColumnFactory)">
+        <member name="M:GBase.GBaseTable`1.#ctor(GBase.FileHandling.Factories.IFileHandlerFactory,GBase.Interfaces.DataHandling.Pool.IDataHandlerPool,GBase.Factories.IGBaseColumnFactory)">
             <summary>
             A <see cref="T:GBase.Interfaces.IGBase"/> table
             </summary>
+            <param name="fileHandlerFactory"></param>
+            <param name="dataHandlerPool">The <see cref="T:GBase.Interfaces.DataHandling.Pool.IDataHandlerPool"/></param>
+            <param name="gBaseColumnFactory"></param>
         </member>
-        <member name="P:GBase.GBaseTable.Type">
+        <member name="P:GBase.GBaseTable`1.Type">
             <summary>
             The <see cref="T:System.Type"/> of the class that this <see cref="T:GBase.Interfaces.IGBaseTable"/> represents
             </summary>
         </member>
-        <member name="P:GBase.GBaseTable.Name">
+        <member name="P:GBase.GBaseTable`1.FolderName">
             <summary>
             The name of this <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
         </member>
-        <member name="P:GBase.GBaseTable.Columns">
+        <member name="P:GBase.GBaseTable`1.Columns">
             <summary>
             The <see cref="T:GBase.Interfaces.IGBaseColumn"/>s of this <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
         </member>
-        <member name="P:GBase.GBaseTable.Entries">
+        <member name="P:GBase.GBaseTable`1.Entries">
             <summary>
             The entries of this <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
         </member>
-        <member name="M:GBase.GBaseTable.Init(System.Type,System.String,System.String,System.Threading.CancellationToken)">
+        <member name="M:GBase.GBaseTable`1.Init(System.Type,System.String,System.String,System.Threading.CancellationToken)">
             <summary>
             Initialize this <see cref="T:GBase.Interfaces.IGBase"/>
             </summary>
             <param name="type">The <see cref="T:System.Type"/> of the class that this <see cref="T:GBase.Interfaces.IGBaseTable"/> represents</param>
-            <param name="name">The name of this <see cref="T:GBase.Interfaces.IGBaseTable"/></param>
             <param name="databasePath">The path to the database files</param>
+            <param name="folderName"></param>
             <param name="cancellationToken">A <see cref="T:System.Threading.CancellationToken"/> to cancel the asynchronous operation</param>
             <returns>True if successful, false if not</returns>
         </member>
-        <member name="M:GBase.GBaseTable.AddColumn(GBase.Interfaces.IGBaseColumn)">
+        <member name="M:GBase.GBaseTable`1.AddColumn(GBase.Interfaces.IGBaseColumn)">
             <summary>
             Add a given <see cref="T:GBase.Interfaces.IGBaseColumn"/> to this <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
             <param name="column">The given <see cref="T:GBase.Interfaces.IGBaseColumn"/></param>
             <returns>True if successful, false if not</returns>
         </member>
-        <member name="M:GBase.GBaseTable.RemoveColumn(GBase.Interfaces.IGBaseColumn)">
+        <member name="M:GBase.GBaseTable`1.RemoveColumn(GBase.Interfaces.IGBaseColumn)">
             <summary>
             Remove a given <see cref="T:GBase.Interfaces.IGBaseColumn"/> from this <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
             <param name="column">The given <see cref="T:GBase.Interfaces.IGBaseColumn"/></param>
             <returns>True if successful, false if not</returns>
         </member>
-        <member name="M:GBase.GBaseTable.AddEntry(GBase.Api.INotifyGBaseEntryChanged)">
+        <member name="M:GBase.GBaseTable`1.AddEntry(`0,System.Threading.CancellationToken)">
             <summary>
-            Add an entry that implements <see cref="T:GBase.Api.INotifyGBaseEntryChanged"/> to this <see cref="T:GBase.Interfaces.IGBaseTable"/>
+            Add an entry that implements <see cref="T:GBase.Interfaces.IGBaseObject"/> to this <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
-            <param name="entry">The entry implementing <see cref="T:GBase.Api.INotifyGBaseEntryChanged"/></param>
+            <param name="entry">The entry implementing <see cref="T:GBase.Interfaces.IGBaseObject"/></param>
+            <param name="cancellationToken"></param>
             <returns>True if successful, false if not</returns>
         </member>
-        <member name="M:GBase.GBaseTable.RemoveEntry(GBase.Api.INotifyGBaseEntryChanged)">
+        <member name="M:GBase.GBaseTable`1.RemoveEntry(`0)">
             <summary>
-            Remove an entry that implements <see cref="T:GBase.Api.INotifyGBaseEntryChanged"/> from this <see cref="T:GBase.Interfaces.IGBaseTable"/>
+            Remove an entry that implements <see cref="T:GBase.Interfaces.IGBaseObject"/> from this <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
-            <param name="entry">The entry implementing <see cref="T:GBase.Api.INotifyGBaseEntryChanged"/></param>
-            <returns>True if successful, false if not</returns>
-        </member>
-        <member name="M:GBase.GBaseTable.ModifyEntry(System.Object,System.String,System.Object)">
-            <summary>
-            Modify the property of a given entry with the given value
-            </summary>
-            <param name="entry">The entry</param>
-            <param name="propertyName">The name of the property</param>
-            <param name="value">The new value to set</param>
+            <param name="entry">The entry implementing <see cref="T:GBase.Interfaces.IGBaseObject"/></param>
             <returns>True if successful, false if not</returns>
         </member>
-        <member name="M:GBase.GBaseTable.OnGBaseEntryChanged(System.Object,GBase.Api.GBaseEntryChangedEventArgs)">
-            <summary>
-            A <see cref="T:GBase.Interfaces.IGBase"/> entry changed
-            </summary>
-            <param name="entry">The entry (sender)</param>
-            <param name="args">The <see cref="T:GBase.Api.GBaseEntryChangedEventArgs"/></param>
-        </member>
-        <member name="M:GBase.GBaseTable.DisposeAsync">
+        <member name="M:GBase.GBaseTable`1.DisposeAsync">
             <summary>
             The <see cref="M:System.IAsyncDisposable.DisposeAsync"/> method
             </summary>
@@ -646,17 +653,73 @@
             Convert an <see cref="T:System.Collections.IEnumerable"/> to a GBase <see cref="T:System.String"/>
             </summary>
             <param name="enumerable">The <see cref="T:System.Collections.IEnumerable"/></param>
-            <returns></returns>
+            <returns>The converted <see cref="T:System.Collections.IEnumerable"/> as a GBase <see cref="T:System.String"/></returns>
         </member>
-        <member name="M:GBase.Helpers.Enumerables.ConvertToGBaseEnumerable``1(System.String)">
+        <member name="M:GBase.Helpers.Enumerables.ConvertToGBaseEnumerable``1(System.String,GBase.Interfaces.IGBase)">
             <summary>
             Convert a given <see cref="T:System.String"/> to an <see cref="T:System.Collections.Generic.IEnumerable`1"/> of <see cref="T:System.Type"/> <typeparamref name="TEnumerable"/>
             </summary>
             <typeparam name="TEnumerable">The <see cref="T:System.Collections.Generic.IEnumerable`1"/> <see cref="T:System.Type"/></typeparam>
+            <typeparam name="T"></typeparam>
             <param name="string">The given <see cref="T:System.String"/></param>
+            <param name="gBase"></param>
             <returns>An <see cref="T:System.Collections.Generic.IEnumerable`1"/> of <see cref="T:System.Type"/> <typeparamref name="TEnumerable"/></returns>
             <exception cref="T:GBase.Exceptions.InterfaceEnumerablePassedException">Interface was passed to an <see cref="T:System.Collections.Generic.IEnumerable`1"/></exception>
         </member>
+        <member name="M:GBase.Helpers.GenericMethodCaller.Call(System.Object,System.String,System.Reflection.BindingFlags,System.Type,System.Object[])">
+            <summary>
+            Call a generic method without generic type parameters
+            </summary>
+            <param name="caller">The caller of the method</param>
+            <param name="functionName">The name of the method to call</param>
+            <param name="bindingFlags">The <see cref="T:System.Reflection.BindingFlags"/> to find the method</param>
+            <param name="genericParameter">The generic parameter as <see cref="T:System.Type"/> parameter</param>
+            <param name="parameters">The parameters of the method</param>
+            <returns>The result of invoking the method</returns>
+            <exception cref="T:GBase.Exceptions.GenericMethodNotFoundException">Could not find the generic method</exception>
+            <exception cref="T:System.Exception">Any <see cref="T:System.Exception"/> thrown after invoking the generic method</exception>
+        </member>
+        <member name="M:GBase.Helpers.GenericMethodCaller.Call(System.Object,System.String,System.Reflection.BindingFlags,System.Type,System.Type,System.Object[])">
+            <summary>
+            Call a generic method without generic type parameters
+            </summary>
+            <param name="caller">The caller of the method</param>
+            <param name="functionName">The name of the method to call</param>
+            <param name="bindingFlags">The <see cref="T:System.Reflection.BindingFlags"/> to find the method</param>
+            <param name="genericParameter">The generic parameter as <see cref="T:System.Type"/> parameter</param>
+            <param name="secondGenericParameter"></param>
+            <param name="parameters">The parameters of the method</param>
+            <returns>The result of invoking the method</returns>
+            <exception cref="T:GBase.Exceptions.GenericMethodNotFoundException">Could not find the generic method</exception>
+            <exception cref="T:System.Exception">Any <see cref="T:System.Exception"/> thrown after invoking the generic method</exception>
+        </member>
+        <member name="M:GBase.Helpers.GenericMethodCaller.CallAsync(System.Object,System.String,System.Reflection.BindingFlags,System.Type,System.Object[])">
+            <summary>
+            Call a generic method asynchronously without generic type parameters
+            </summary>
+            <param name="caller">The caller of the method</param>
+            <param name="functionName">The name of the method to call</param>
+            <param name="bindingFlags">The <see cref="T:System.Reflection.BindingFlags"/> to find the method</param>
+            <param name="genericParameter">The generic parameter as <see cref="T:System.Type"/> parameter</param>
+            <param name="parameters">The parameters of the method</param>
+            <returns>The result of invoking the method</returns>
+            <exception cref="T:GBase.Exceptions.GenericMethodNotFoundException">Could not find the generic method</exception>
+            <exception cref="T:System.Exception">Any <see cref="T:System.Exception"/> thrown after invoking the generic method</exception>
+        </member>
+        <member name="M:GBase.Helpers.GenericMethodCaller.CallAsync(System.Object,System.String,System.Reflection.BindingFlags,System.Type,System.Type,System.Object[])">
+            <summary>
+            Call a generic method asynchronously without generic type parameters
+            </summary>
+            <param name="caller">The caller of the method</param>
+            <param name="functionName">The name of the method to call</param>
+            <param name="bindingFlags">The <see cref="T:System.Reflection.BindingFlags"/> to find the method</param>
+            <param name="genericParameter">The generic parameter as <see cref="T:System.Type"/> parameter</param>
+            <param name="secondGenericParameter"></param>
+            <param name="parameters">The parameters of the method</param>
+            <returns>The result of invoking the method</returns>
+            <exception cref="T:GBase.Exceptions.GenericMethodNotFoundException">Could not find the generic method</exception>
+            <exception cref="T:System.Exception">Any <see cref="T:System.Exception"/> thrown after invoking the generic method</exception>
+        </member>
         <member name="T:GBase.Installers.DataHandlingInstaller">
             <summary>
             <see cref="T:LightweightIocContainer.Interfaces.Installers.IIocInstaller"/> for the data handling
@@ -707,13 +770,15 @@
             <param name="value">The value to set</param>
             <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
         </member>
-        <member name="M:GBase.Interfaces.DataHandling.Cache.IDataHandlerCache.TryGetValues``2(System.String)">
+        <member name="M:GBase.Interfaces.DataHandling.Cache.IDataHandlerCache.TryGetValues``2(System.IO.FileStream,System.String,System.Threading.CancellationToken)">
             <summary>
             Try to get values from the cache for the given property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/> that implements the property</typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="file"></param>
             <param name="propertyName">The name of the property</param>
+            <param name="cancellationToken"></param>
             <returns>An <see cref="T:System.Collections.Generic.IEnumerable`1"/> with all the values for the property</returns>
         </member>
         <member name="T:GBase.Interfaces.DataHandling.Cache.IDataHandlerCacheEntry">
@@ -756,50 +821,57 @@
             Interface for data handlers to implement
             </summary>
         </member>
-        <member name="M:GBase.Interfaces.DataHandling.IDataHandler.Init(System.Boolean,System.Threading.CancellationToken)">
+        <member name="M:GBase.Interfaces.DataHandling.IDataHandler.Init(System.Boolean)">
             <summary>
             Initialize the <see cref="T:GBase.Interfaces.DataHandling.IDataHandler"/>
             </summary>
             <param name="overwrite">If true an existing value is overwritten, if false an additional value is added</param>
-            <param name="cancellationToken">A <see cref="T:System.Threading.CancellationToken"/> to cancel the async operation</param>
             <returns>Returns true if successful, false if not</returns>
         </member>
-        <member name="M:GBase.Interfaces.DataHandling.IDataHandler.SetValue``2(System.String,``1)">
+        <member name="M:GBase.Interfaces.DataHandling.IDataHandler.SetValue``2(System.IO.FileStream,System.String,``1,System.Threading.CancellationToken)">
             <summary>
             Set the value for the given property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="entryFile"></param>
             <param name="propertyName">The name of the property</param>
             <param name="value">The value to set</param>
+            <param name="cancellationToken"></param>
             <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
         </member>
-        <member name="M:GBase.Interfaces.DataHandling.IDataHandler.RemoveValue``2(System.String,``1)">
+        <member name="M:GBase.Interfaces.DataHandling.IDataHandler.RemoveValue``2(System.IO.FileStream,System.String,``1,System.Threading.CancellationToken)">
             <summary>
             Remove the value for the given property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="entryFile"></param>
             <param name="propertyName">The name of the property</param>
             <param name="value">The value to set</param>
+            <param name="cancellationToken"></param>
             <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
         </member>
-        <member name="M:GBase.Interfaces.DataHandling.IDataHandler.GetValue``2(System.String)">
+        <member name="M:GBase.Interfaces.DataHandling.IDataHandler.GetValue``2(System.IO.FileStream,System.String,System.Threading.CancellationToken)">
             <summary>
             Get the value for the given property, if multiple values are set the first is returned
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="file"></param>
             <param name="propertyName">The name of the property</param>
+            <param name="cancellationToken"></param>
             <returns>The value for the given property</returns>
         </member>
-        <member name="M:GBase.Interfaces.DataHandling.IDataHandler.GetValues``2(System.String)">
+        <member name="M:GBase.Interfaces.DataHandling.IDataHandler.GetValues``2(System.IO.FileStream,System.String,System.Threading.CancellationToken)">
             <summary>
             Get all the values that are set for the given property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="file"></param>
             <param name="propertyName">The name of the property</param>
+            <param name="cancellationToken"></param>
             <returns>An <see cref="T:System.Collections.Generic.IEnumerable`1"/> with all the values for the property</returns>
         </member>
         <member name="T:GBase.Interfaces.DataHandling.IDataReader">
@@ -807,20 +879,15 @@
             Interface for data readers to implement
             </summary>
         </member>
-        <member name="M:GBase.Interfaces.DataHandling.IDataReader.Init(System.Threading.CancellationToken)">
-            <summary>
-            Initialize the <see cref="T:GBase.Interfaces.DataHandling.IDataReader"/>
-            </summary>
-            <param name="cancellationToken">A <see cref="T:System.Threading.CancellationToken"/> to cancel the async operation</param>
-            <returns>Returns true if successful, false if not</returns>
-        </member>
-        <member name="M:GBase.Interfaces.DataHandling.IDataReader.Read``2(System.String)">
+        <member name="M:GBase.Interfaces.DataHandling.IDataReader.Read``2(System.IO.FileStream,System.String,System.Threading.CancellationToken)">
             <summary>
             Read the data of a property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/></typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="file"></param>
             <param name="propertyName">The name of the property</param>
+            <param name="cancellationToken"></param>
             <returns>The data of the given property, null if no data found</returns>
         </member>
         <member name="T:GBase.Interfaces.DataHandling.IDataWriter">
@@ -828,32 +895,51 @@
             Interface for data writers to implement
             </summary>
         </member>
-        <member name="M:GBase.Interfaces.DataHandling.IDataWriter.Init(System.Threading.CancellationToken)">
+        <member name="M:GBase.Interfaces.DataHandling.IDataWriter.InitFile(System.IO.FileStream,System.String,System.Threading.CancellationToken)">
             <summary>
             Initialize the <see cref="T:GBase.Interfaces.DataHandling.IDataWriter"/>
             </summary>
+            <param name="file"></param>
+            <param name="rootElementName"></param>
             <param name="cancellationToken">A <see cref="T:System.Threading.CancellationToken"/> to cancel the async operation</param>
             <returns>Returns true if successful, false if not</returns>
         </member>
-        <member name="M:GBase.Interfaces.DataHandling.IDataWriter.Write``2(System.String,System.String,System.Boolean)">
+        <member name="M:GBase.Interfaces.DataHandling.IDataWriter.Write``2(System.IO.FileStream,System.String,System.String,System.Boolean,System.Threading.CancellationToken)">
             <summary>
             Write the data of a property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/></typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="file"></param>
             <param name="propertyName">The name of the property</param>
             <param name="value">The value of the property</param>
             <param name="overwrite">If true an existing value is overwritten, if false an additional value is added</param>
+            <param name="cancellationToken"></param>
             <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
         </member>
-        <member name="M:GBase.Interfaces.DataHandling.IDataWriter.Remove``2(System.String,System.String)">
+        <member name="M:GBase.Interfaces.DataHandling.IDataWriter.Write``1(System.IO.FileStream,System.String,System.String,System.Type,System.Boolean,System.Threading.CancellationToken)">
+            <summary>
+            Write the data of a property
+            </summary>
+            <typeparam name="T">The <see cref="T:System.Type"/></typeparam>
+            <param name="file"></param>
+            <param name="propertyName">The name of the property</param>
+            <param name="value">The value of the property</param>
+            <param name="propertyType"></param>
+            <param name="overwrite">If true an existing value is overwritten, if false an additional value is added</param>
+            <param name="cancellationToken"></param>
+            <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
+        </member>
+        <member name="M:GBase.Interfaces.DataHandling.IDataWriter.Remove``2(System.IO.FileStream,System.String,System.String,System.Threading.CancellationToken)">
             <summary>
             Remove the value for the given property
             </summary>
             <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
             <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
+            <param name="file"></param>
             <param name="propertyName">The name of the property</param>
             <param name="value">The value to set</param>
+            <param name="cancellationToken"></param>
             <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
         </member>
         <member name="T:GBase.Interfaces.DataHandling.Xml.Cache.IXmlDataHandlerCache">
@@ -891,52 +977,15 @@
             Internal file handler
             </summary>
         </member>
-        <member name="M:GBase.Interfaces.FileHandling.IFileHandler.Init(System.String,System.Threading.CancellationToken)">
+        <member name="M:GBase.Interfaces.FileHandling.IFileHandler.Init(System.String,System.String,System.Threading.CancellationToken)">
             <summary>
             Initialize this <see cref="T:GBase.Interfaces.FileHandling.IFileHandler"/>
             </summary>
             <param name="path">The path of the database</param>
+            <param name="folderName"></param>
             <param name="cancellationToken">A <see cref="T:System.Threading.CancellationToken"/> to cancel the asynchronous operation</param>
             <returns>True if successful, false if not</returns>
         </member>
-        <member name="M:GBase.Interfaces.FileHandling.IFileHandler.SetValue``2(System.String,``1)">
-            <summary>
-            Set the value for the given property
-            </summary>
-            <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
-            <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
-            <param name="propertyName">The name of the property</param>
-            <param name="value">The value to set</param>
-            <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
-        </member>
-        <member name="M:GBase.Interfaces.FileHandling.IFileHandler.RemoveValue``2(System.String,``1)">
-            <summary>
-            Remove the value for the given property
-            </summary>
-            <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
-            <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
-            <param name="propertyName">The name of the property</param>
-            <param name="value">The value to set</param>
-            <returns>A <see cref="T:System.Threading.Tasks.Task"/> to await</returns>
-        </member>
-        <member name="M:GBase.Interfaces.FileHandling.IFileHandler.GetValue``2(System.String)">
-            <summary>
-            Get the value for the given property, if multiple values are set the first is returned
-            </summary>
-            <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
-            <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
-            <param name="propertyName">The name of the property</param>
-            <returns>The value for the given property</returns>
-        </member>
-        <member name="M:GBase.Interfaces.FileHandling.IFileHandler.GetValues``2(System.String)">
-            <summary>
-            Get all the values that are set for the given property
-            </summary>
-            <typeparam name="T">The <see cref="T:System.Type"/> of the property</typeparam>
-            <typeparam name="TProperty">The <see cref="T:System.Type"/> of the property</typeparam>
-            <param name="propertyName">The name of the property</param>
-            <returns>An <see cref="T:System.Collections.Generic.IEnumerable`1"/> with all the values for the property</returns>
-        </member>
         <member name="T:GBase.Interfaces.IGBase">
             <summary>
             The base class of the GBase database
@@ -985,6 +1034,47 @@
             A column of a <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
         </member>
+        <member name="T:GBase.Interfaces.IGBaseObject">
+            <summary>
+            GBase object that allows conversion from <see cref="T:System.String"/>
+            </summary>
+        </member>
+        <member name="P:GBase.Interfaces.IGBaseObject.Key">
+            <summary>
+            <see cref="T:GBase.Interfaces.IGBase"/> Key
+            </summary>
+        </member>
+        <member name="P:GBase.Interfaces.IGBaseObject.FileName">
+            <summary>
+            The FileName of the GBase file for an entry of this object
+            </summary>
+        </member>
+        <member name="M:GBase.Interfaces.IGBaseObject.InitializeFromString(System.String)">
+            <summary>
+            Initialize this <see cref="T:GBase.Interfaces.IGBaseObject"/> from a given <see cref="T:System.String"/>
+            </summary>
+            <param name="string">The given <see cref="T:System.String"/></param>
+        </member>
+        <member name="P:GBase.Interfaces.IGBaseTable`1.Entries">
+            <summary>
+            The entries of this <see cref="T:GBase.Interfaces.IGBaseTable"/>
+            </summary>
+        </member>
+        <member name="M:GBase.Interfaces.IGBaseTable`1.AddEntry(`0,System.Threading.CancellationToken)">
+            <summary>
+            Add an entry that implements <see cref="T:GBase.Interfaces.IGBaseObject"/> to this <see cref="T:GBase.Interfaces.IGBaseTable"/>
+            </summary>
+            <param name="entry">The entry implementing <see cref="T:GBase.Interfaces.IGBaseObject"/></param>
+            <param name="cancellationToken"></param>
+            <returns>True if successful, false if not</returns>
+        </member>
+        <member name="M:GBase.Interfaces.IGBaseTable`1.RemoveEntry(`0)">
+            <summary>
+            Remove an entry that implements <see cref="T:GBase.Interfaces.IGBaseObject"/> from this <see cref="T:GBase.Interfaces.IGBaseTable"/>
+            </summary>
+            <param name="entry">The entry implementing <see cref="T:GBase.Interfaces.IGBaseObject"/></param>
+            <returns>True if successful, false if not</returns>
+        </member>
         <member name="T:GBase.Interfaces.IGBaseTable">
             <summary>
             A <see cref="T:GBase.Interfaces.IGBase"/> table
@@ -995,7 +1085,7 @@
             The <see cref="T:System.Type"/> of the class that this <see cref="T:GBase.Interfaces.IGBaseTable"/> represents
             </summary>
         </member>
-        <member name="P:GBase.Interfaces.IGBaseTable.Name">
+        <member name="P:GBase.Interfaces.IGBaseTable.FolderName">
             <summary>
             The name of this <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
@@ -1005,19 +1095,15 @@
             The <see cref="T:GBase.Interfaces.IGBaseColumn"/>s of this <see cref="T:GBase.Interfaces.IGBaseTable"/>
             </summary>
         </member>
-        <member name="P:GBase.Interfaces.IGBaseTable.Entries">
-            <summary>
-            The entries of this <see cref="T:GBase.Interfaces.IGBaseTable"/>
-            </summary>
-        </member>
         <member name="M:GBase.Interfaces.IGBaseTable.Init(System.Type,System.String,System.String,System.Threading.CancellationToken)">
             <summary>
             Initialize this <see cref="T:GBase.Interfaces.IGBase"/>
             </summary>
             <param name="type">The <see cref="T:System.Type"/> of the class that this <see cref="T:GBase.Interfaces.IGBaseTable"/> represents</param>
-            <param name="name">The name of this <see cref="T:GBase.Interfaces.IGBaseTable"/></param>
-            /// <param name="databasePath">The path to the database files</param>
+            <param name="databasePath">The path to the database files</param>
+            <param name="folderName"></param>
             <param name="cancellationToken">A <see cref="T:System.Threading.CancellationToken"/> to cancel the asynchronous operation</param>
+            ///
             <returns>True if successful, false if not</returns>
         </member>
         <member name="M:GBase.Interfaces.IGBaseTable.AddColumn(GBase.Interfaces.IGBaseColumn)">
@@ -1034,20 +1120,6 @@
             <param name="column">The given <see cref="T:GBase.Interfaces.IGBaseColumn"/></param>
             <returns>True if successful, false if not</returns>
         </member>
-        <member name="M:GBase.Interfaces.IGBaseTable.AddEntry(GBase.Api.INotifyGBaseEntryChanged)">
-            <summary>
-            Add an entry that implements <see cref="T:GBase.Api.INotifyGBaseEntryChanged"/> to this <see cref="T:GBase.Interfaces.IGBaseTable"/>
-            </summary>
-            <param name="entry">The entry implementing <see cref="T:GBase.Api.INotifyGBaseEntryChanged"/></param>
-            <returns>True if successful, false if not</returns>
-        </member>
-        <member name="M:GBase.Interfaces.IGBaseTable.RemoveEntry(GBase.Api.INotifyGBaseEntryChanged)">
-            <summary>
-            Remove an entry that implements <see cref="T:GBase.Api.INotifyGBaseEntryChanged"/> from this <see cref="T:GBase.Interfaces.IGBaseTable"/>
-            </summary>
-            <param name="entry">The entry implementing <see cref="T:GBase.Api.INotifyGBaseEntryChanged"/></param>
-            <returns>True if successful, false if not</returns>
-        </member>
         <member name="T:GBase.Interfaces.Settings.IGBaseSettings">
             <summary>
             Settings of a <see cref="T:GBase.Interfaces.IGBase"/> instance

GBase/GBaseColumn.cs

@@ -16,11 +16,17 @@ namespace GBase
         /// <summary>
         /// A column of a <see cref="IGBaseTable"/>
         /// </summary>
-        public GBaseColumn()
+        public GBaseColumn(string name, Type type, bool isKey)
         {
-
+            Name = name;
+            Type = type;
+            IsKey = isKey;
         }
         
+        public string Name { get; }
+        public Type Type { get; }
+        public bool IsKey { get; }
+
         /// <summary>
         /// The <see cref="IAsyncDisposable.DisposeAsync"/> method
         /// </summary>

GBase/GBaseKey.cs

@@ -0,0 +1,30 @@
+// Author: Gockner, Simon
+// Created: 2020-11-13
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace GBase
+{
+    public class GBaseKey
+    {
+        private int _key = -1;
+        private bool _isSet;
+
+        public int Key
+        {
+            get => _key;
+            internal set
+            {
+                if (_isSet)
+                    throw new InvalidOperationException("Key is already set.");
+
+                _key = value;
+                _isSet = true;
+            }
+        }
+
+        public override string ToString() => $"{Key}";
+        public static implicit operator int(GBaseKey key) => key.Key;
+    }
+}

GBase/GBaseObject.cs

@@ -0,0 +1,45 @@
+// Author: Gockner, Simon
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using GBase.Exceptions;
+using GBase.Interfaces;
+
+namespace GBase
+{
+    /// <summary>
+    /// GBase object that supplies inheriting classes with methods to get data from a <see cref="IGBase"/>
+    /// </summary>
+    public abstract class GBaseObject<T> : IGBaseObject where T : IGBaseObject, new()
+    {
+        private readonly IGBaseTable<T> _gBaseTable;
+        
+        /// <summary>
+        /// GBase object that allows conversion from <see cref="string"/>
+        /// </summary>
+        /// <exception cref="MissingTableException{T}">No table for <typeparamref name="T"/> is existing</exception>
+        protected GBaseObject(IGBase gBase)
+        {
+            _gBaseTable = gBase.GetTable<T>();
+            if (_gBaseTable == null)
+                throw new MissingTableException<T>();
+        }
+
+        public GBaseKey Key { get; set; }
+        public abstract string FileName { get; }
+        
+        protected async Task SetValue<TProperty>(T @this, string propertyName, TProperty value, CancellationToken cancellationToken) =>
+            await _gBaseTable.SetValue(@this, propertyName, value, cancellationToken);
+
+        protected async Task<TProperty> GetValue<TProperty>(T @this, string propertyName, CancellationToken cancellationToken) =>
+            await _gBaseTable.GetValue<TProperty>(@this, propertyName, cancellationToken);
+        
+        protected async Task<IEnumerable<TProperty>> GetValues<TProperty>(T @this, string propertyName, CancellationToken cancellationToken) =>
+            await _gBaseTable.GetValues<TProperty>(@this, propertyName, cancellationToken);
+
+        public abstract void Initialize(GBaseKey key, List<object> parameters);
+    }
+}

GBase/GBaseTable.cs

@@ -4,16 +4,18 @@
 
 using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 using System.Reflection;
 using System.Threading;
 using System.Threading.Tasks;
-using GBase.Api;
 using GBase.Attributes;
+using GBase.Exceptions;
 using GBase.Factories;
 using GBase.FileHandling.Factories;
+using GBase.Helpers;
 using GBase.Interfaces;
+using GBase.Interfaces.DataHandling;
+using GBase.Interfaces.DataHandling.Pool;
 using GBase.Interfaces.FileHandling;
 
 namespace GBase
@@ -21,21 +23,26 @@ namespace GBase
     /// <summary>
     /// A <see cref="IGBase"/> table
     /// </summary>
-    public class GBaseTable : IGBaseTable
+    public class GBaseTable<T> : IGBaseTable<T> where T : IGBaseObject, new()
     {
         private readonly IFileHandler _fileHandler;
+        private readonly IDataHandlerPool _dataHandlerPool;
         private readonly IGBaseColumnFactory _gBaseColumnFactory;
 
         /// <summary>
         /// A <see cref="IGBase"/> table
         /// </summary>
-        public GBaseTable(IFileHandlerFactory fileHandlerFactory, IGBaseColumnFactory gBaseColumnFactory)
+        /// <param name="fileHandlerFactory"></param>
+        /// <param name="dataHandlerPool">The <see cref="IDataHandlerPool"/></param>
+        /// <param name="gBaseColumnFactory"></param>
+        public GBaseTable(IFileHandlerFactory fileHandlerFactory, IDataHandlerPool dataHandlerPool, IGBaseColumnFactory gBaseColumnFactory)
         {
             _fileHandler = fileHandlerFactory.Create();
+            _dataHandlerPool = dataHandlerPool;
             _gBaseColumnFactory = gBaseColumnFactory;
 
             Columns = new List<IGBaseColumn>();
-            Entries = new List<object>();
+            Entries = new List<T>();
         }
 
 
@@ -47,7 +54,7 @@ namespace GBase
         /// <summary>
         /// The name of this <see cref="IGBaseTable"/>
         /// </summary>
-        public string Name { get; private set; }
+        public string FolderName { get; private set; }
 
         /// <summary>
         /// The <see cref="IGBaseColumn"/>s of this <see cref="IGBaseTable"/>
@@ -57,38 +64,85 @@ namespace GBase
         /// <summary>
         /// The entries of this <see cref="IGBaseTable"/>
         /// </summary>
-        public List<object> Entries { get; }
+        public List<T> Entries { get; }
+
+        private int CurrentLastKey
+        {
+            get
+            {
+                T lastEntry = Entries.LastOrDefault();
+                if (lastEntry == null)
+                    return -1;
+
+                return lastEntry.Key;
+            }
+        }
 
 
         /// <summary>
         /// Initialize this <see cref="IGBase"/>
         /// </summary>
         /// <param name="type">The <see cref="System.Type"/> of the class that this <see cref="IGBaseTable"/> represents</param>
-        /// <param name="name">The name of this <see cref="IGBaseTable"/></param>
         /// <param name="databasePath">The path to the database files</param>
+        /// <param name="folderName"></param>
         /// <param name="cancellationToken">A <see cref="CancellationToken"/> to cancel the asynchronous operation</param>
         /// <returns>True if successful, false if not</returns>
-        public async Task<bool> Init(Type type, string name, string databasePath, CancellationToken cancellationToken)
+        public async Task Init(Type type, string databasePath, string folderName, CancellationToken cancellationToken)
         {
             Type = type;
-            Name = name;
-
-            string fileName = $"{name}.{GBase.GBASE_TABLE_FILE_EXTENSION}";
-            string path = Path.Combine(databasePath, fileName);
-            await _fileHandler.Init(path, cancellationToken);
+            FolderName = folderName;
 
             //TODO: Init columns list depending on GBaseColumnAttributes set for this GBaseTable
             foreach (var property in type.GetProperties())
             {
-                GBaseColumnAttribute gBaseColumnAttribute = property.GetCustomAttribute<GBaseColumnAttribute>();
+                GBaseColumnAttribute gBaseColumnAttribute = property.GetCustomAttribute<GBaseColumnAttribute>() ??
+                                                            property.GetAttributeFromInheritedInterfaces<GBaseColumnAttribute>();
+
                 if (gBaseColumnAttribute == null)
                     continue;
 
-                IGBaseColumn gBaseColumn = _gBaseColumnFactory.Create();
+                IGBaseColumn gBaseColumn = _gBaseColumnFactory.Create(property.Name, property.PropertyType, gBaseColumnAttribute.IsKey);
                 AddColumn(gBaseColumn);
             }
             
-            return true;
+            List<IGBaseFile> files = _fileHandler.Init(databasePath, FolderName, cancellationToken);
+            if (files == null)
+                return;
+            
+            foreach (var file in files) //create entries for existing files
+            {
+                using (file.UseFile())
+                {
+                    T entry = new T();
+                    
+                    List<object> parameters = new List<object>();
+                    foreach (var column in Columns.Where(c => !c.IsKey))
+                    {
+                        using IPoolItem<IDataHandler> dataHandlerItem = await _dataHandlerPool.RequestDataHandler(this, false, cancellationToken);
+                        
+                        parameters.Add(await GenericMethodCaller.CallAsync(dataHandlerItem.Use(), 
+                            nameof(IDataHandler.GetValue), 
+                            BindingFlags.Public | BindingFlags.Instance,
+                            typeof(T), column.Type,
+                            file.File, column.Name, cancellationToken));
+                    }
+
+                    IGBaseColumn keyColumn = Columns.FirstOrDefault(c => c.IsKey);
+                    if (keyColumn == null)
+                        throw new MissingKeyColumnException<T>();
+
+                    GBaseKey key = new GBaseKey();
+                    using (IPoolItem<IDataHandler> dataHandlerItem = await _dataHandlerPool.RequestDataHandler(this, false, cancellationToken))
+                    {
+                        key.Key = await dataHandlerItem.Use().GetValue<T, int>(file.File, keyColumn.Name, cancellationToken);
+                    }
+                    
+                    entry.Initialize(key, parameters);
+
+                    file.Entry = entry;
+                    Entries.Add(entry);
+                }
+            }
         }
 
         /// <summary>
@@ -96,7 +150,7 @@ namespace GBase
         /// </summary>
         /// <param name="column">The given <see cref="IGBaseColumn"/></param>
         /// <returns>True if successful, false if not</returns>
-        public bool AddColumn(IGBaseColumn column)
+        public bool AddColumn(IGBaseColumn column) //TODO: if a column is added, it has to be added to every entry file as well
         {
             if (Columns.Contains(column))
                 return false;
@@ -110,7 +164,7 @@ namespace GBase
         /// </summary>
         /// <param name="column">The given <see cref="IGBaseColumn"/></param>
         /// <returns>True if successful, false if not</returns>
-        public bool RemoveColumn(IGBaseColumn column)
+        public bool RemoveColumn(IGBaseColumn column) //TODO: if a column is removed, it has to be removed from every entry file as well
         {
             if (!Columns.Contains(column))
                 return false;
@@ -119,58 +173,65 @@ namespace GBase
         }
 
         /// <summary>
-        /// Add an entry that implements <see cref="INotifyGBaseEntryChanged"/> to this <see cref="IGBaseTable"/>
+        /// Add an entry that implements <see cref="IGBaseObject"/> to this <see cref="IGBaseTable"/>
         /// </summary>
-        /// <param name="entry">The entry implementing <see cref="INotifyGBaseEntryChanged"/></param>
+        /// <param name="entry">The entry implementing <see cref="IGBaseObject"/></param>
+        /// <param name="cancellationToken"></param>
         /// <returns>True if successful, false if not</returns>
-        public bool AddEntry(INotifyGBaseEntryChanged entry) //TODO: Write to file
+        public async Task<bool> AddEntry(T entry, CancellationToken cancellationToken)
         {
+            entry.Key ??= new GBaseKey();
+            
+            if (entry.Key != -1)
+                throw new InvalidKeyException("Key of entry is already set. Make sure it is -1 when initializing.");
+            
+            entry.Key.Key = CurrentLastKey + 1; //set next possible key
+            
             Entries.Add(entry);
-            entry.GBaseEntryChanged += OnGBaseEntryChanged;
+
+            using IGBaseFile file = _fileHandler.CreateEntryFile(entry, this);
+            using IPoolItem<IDataHandler> dataHandlerItem = await _dataHandlerPool.RequestDataHandler(this, false, cancellationToken);
+            await dataHandlerItem.Use().AddEntry(entry, this, file.File, cancellationToken);
 
             return true;
         }
 
+        public T GetEntryForKey(int key) => Entries.FirstOrDefault(e => e.Key == key);
+
         /// <summary>
-        /// Remove an entry that implements <see cref="INotifyGBaseEntryChanged"/> from this <see cref="IGBaseTable"/>
+        /// Remove an entry that implements <see cref="IGBaseObject"/> from this <see cref="IGBaseTable"/>
         /// </summary>
-        /// <param name="entry">The entry implementing <see cref="INotifyGBaseEntryChanged"/></param>
+        /// <param name="entry">The entry implementing <see cref="IGBaseObject"/></param>
         /// <returns>True if successful, false if not</returns>
-        public bool RemoveEntry(INotifyGBaseEntryChanged entry) //TODO: remove from file
+        public async Task<bool> RemoveEntry(T entry)
         {
             if (!Entries.Contains(entry))
                 return false;
 
-            entry.GBaseEntryChanged -= OnGBaseEntryChanged;
+            await _fileHandler.DeleteEntryFile(entry);
 
             return Entries.Remove(entry);
         }
 
-        /// <summary>
-        /// Modify the property of a given entry with the given value
-        /// </summary>
-        /// <param name="entry">The entry</param>
-        /// <param name="propertyName">The name of the property</param>
-        /// <param name="value">The new value to set</param>
-        /// <returns>True if successful, false if not</returns>
-        private bool ModifyEntry(object entry, string propertyName, object value) //TODO: Write to file
+        public async Task SetValue<TProperty>(T entry, string propertyName, TProperty value, CancellationToken cancellationToken)
         {
-            //don't need to change value of property in `Entries` list, the instance is saved there, any property change is already changed there as well
-            return true;
+            using IGBaseFile file = await _fileHandler.RequestEntryFile(entry);
+            using IPoolItem<IDataHandler> dataHandlerItem = await _dataHandlerPool.RequestDataHandler(this, false, cancellationToken);
+            await dataHandlerItem.Use().SetValue<T, TProperty>(file.File, propertyName, value, cancellationToken);
         }
 
-        /// <summary>
-        /// A <see cref="IGBase"/> entry changed
-        /// </summary>
-        /// <param name="entry">The entry (sender)</param>
-        /// <param name="args">The <see cref="GBaseEntryChangedEventArgs"/></param>
-        private void OnGBaseEntryChanged(object entry, GBaseEntryChangedEventArgs args)
+        public async Task<TProperty> GetValue<TProperty>(T entry, string propertyName, CancellationToken cancellationToken)
         {
-            //TODO: Might change, depending on #23
-            bool success = ModifyEntry(entry, args.ColumnName, args.Value);
+            using IGBaseFile file = await _fileHandler.RequestEntryFile(entry);
+            using IPoolItem<IDataHandler> dataHandlerItem = await _dataHandlerPool.RequestDataHandler(this, false, cancellationToken);
+            return await dataHandlerItem.Use().GetValue<T, TProperty>(file.File, propertyName, cancellationToken);
+        }
         
-            if (!success)
-                throw new Exception("Failed to handle EntryChanged"); //TODO: Decide what to do here
+        public async Task<IEnumerable<TProperty>> GetValues<TProperty>(T entry, string propertyName, CancellationToken cancellationToken)
+        {
+            using IGBaseFile file = await _fileHandler.RequestEntryFile(entry);
+            using IPoolItem<IDataHandler> dataHandlerItem = await _dataHandlerPool.RequestDataHandler(this, false, cancellationToken);
+            return await dataHandlerItem.Use().GetValues<T, TProperty>(file.File, propertyName, cancellationToken);
         }
 
         /// <summary>
@@ -180,6 +241,7 @@ namespace GBase
         public async ValueTask DisposeAsync()
         {
             await _fileHandler.DisposeAsync();
+            await _dataHandlerPool.DisposeAsync();
 
             foreach (var column in Columns)
             {
@@ -188,9 +250,9 @@ namespace GBase
 
             Columns.Clear();
 
-            foreach (var entry in Entries.OfType<INotifyGBaseEntryChanged>().ToList())
+            foreach (var entry in Entries.ToList())
             {
-                RemoveEntry(entry);
+                await RemoveEntry(entry);
             }
 
             Entries.Clear();

GBase/Helpers/Attributes.cs

@@ -0,0 +1,19 @@
+// Author: Gockner, Simon
+// Created: 2020-11-13
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+using System.Linq;
+using System.Reflection;
+
+namespace GBase.Helpers
+{
+    internal static class Attributes
+    {
+        public static T GetAttributeFromInheritedInterfaces<T>(this PropertyInfo propertyInfo) where T : Attribute =>
+            propertyInfo.DeclaringType?.GetInterfaces()
+                .SelectMany(i => i.GetProperties().Where(p => p.Name.Equals(propertyInfo.Name)))
+                .Select(p => p.GetCustomAttribute<T>())
+                .FirstOrDefault();
+    }
+}

GBase/Helpers/Enumerables.cs

@@ -6,9 +6,10 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reflection;
 using System.Text;
-using GBase.Api;
 using GBase.Exceptions;
+using GBase.Interfaces;
 
 namespace GBase.Helpers
 {
@@ -20,12 +21,15 @@ namespace GBase.Helpers
         /// Convert an <see cref="IEnumerable"/> to a GBase <see cref="string"/>
         /// </summary>
         /// <param name="enumerable">The <see cref="IEnumerable"/></param>
-        /// <returns></returns>
+        /// <returns>The converted <see cref="IEnumerable"/> as a GBase <see cref="string"/></returns>
         public static string ToGBaseString(this IEnumerable enumerable)
         {
             StringBuilder @string = new StringBuilder();
             foreach (var item in enumerable)
             {
+                if (item is IGBaseObject gBaseObject)
+                    @string.Append($"{gBaseObject.Key}{ENUMERABLE_STRING_DIVIDER}");
+                else
                     @string.Append($"{item}{ENUMERABLE_STRING_DIVIDER}");
             }
 
@@ -41,9 +45,10 @@ namespace GBase.Helpers
         /// </summary>
         /// <typeparam name="TEnumerable">The <see cref="IEnumerable{T}"/> <see cref="Type"/></typeparam>
         /// <param name="string">The given <see cref="string"/></param>
+        /// <param name="gBase"></param>
         /// <returns>An <see cref="IEnumerable{T}"/> of <see cref="Type"/> <typeparamref name="TEnumerable"/></returns>
         /// <exception cref="InterfaceEnumerablePassedException">Interface was passed to an <see cref="IEnumerable{T}"/></exception>
-        public static TEnumerable ConvertToGBaseEnumerable<TEnumerable>(string @string)
+        public static TEnumerable ConvertToGBaseEnumerable<TEnumerable>(string @string, IGBase gBase)
         {
             //get generic type parameter of TEnumerable
             Type genericType = typeof(TEnumerable).GetGenericArguments()[0];
@@ -61,9 +66,16 @@ namespace GBase.Helpers
                     if (genericType.IsInterface)
                         throw new InterfaceEnumerablePassedException(genericType);
 
-                    IGBaseObject gBaseObject = (IGBaseObject) Activator.CreateInstance(genericType);
-                    gBaseObject.InitializeFromString(value);
-                    item = gBaseObject;
+                    if (!int.TryParse(value, out int key))
+                        throw new InvalidKeyException("Key is not an integer.");
+
+                    //TODO: What to do when this table isn't initialized yet?
+                    item = GenericMethodCaller.Call(gBase, nameof(IGBase.GetEntryForKey),
+                        BindingFlags.Public | BindingFlags.Instance, genericType, key);
+
+                    // IGBaseObject gBaseObject = (IGBaseObject) Activator.CreateInstance(genericType);
+                    // gBaseObject.InitializeFromString(value);
+                    // item = gBaseObject;
                 }
                 else 
                     item = Convert.ChangeType(value, genericType);

GBase/Helpers/GenericMethodCaller.cs

@@ -0,0 +1,108 @@
+// Author: Gockner, Simon
+// Created: 2020-11-13
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+using System.Reflection;
+using System.Threading.Tasks;
+using GBase.Exceptions;
+
+namespace GBase.Helpers
+{
+    internal static class GenericMethodCaller
+    {
+        /// <summary>
+        /// Call a generic method without generic type parameters
+        /// </summary>
+        /// <param name="caller">The caller of the method</param>
+        /// <param name="functionName">The name of the method to call</param>
+        /// <param name="bindingFlags">The <see cref="BindingFlags"/> to find the method</param>
+        /// <param name="genericParameter">The generic parameter as <see cref="Type"/> parameter</param>
+        /// <param name="parameters">The parameters of the method</param>
+        /// <returns>The result of invoking the method</returns>
+        /// <exception cref="GenericMethodNotFoundException">Could not find the generic method</exception>
+        /// <exception cref="Exception">Any <see cref="Exception"/> thrown after invoking the generic method</exception>
+        public static object Call(object caller, string functionName, BindingFlags bindingFlags, Type genericParameter, params object[] parameters) => 
+            GetGenericMethod(caller, functionName, bindingFlags, genericParameter).InvokeGenericMethod(caller, parameters);
+
+        /// <summary>
+        /// Call a generic method without generic type parameters
+        /// </summary>
+        /// <param name="caller">The caller of the method</param>
+        /// <param name="functionName">The name of the method to call</param>
+        /// <param name="bindingFlags">The <see cref="BindingFlags"/> to find the method</param>
+        /// <param name="genericParameter">The generic parameter as <see cref="Type"/> parameter</param>
+        /// <param name="secondGenericParameter"></param>
+        /// <param name="parameters">The parameters of the method</param>
+        /// <returns>The result of invoking the method</returns>
+        /// <exception cref="GenericMethodNotFoundException">Could not find the generic method</exception>
+        /// <exception cref="Exception">Any <see cref="Exception"/> thrown after invoking the generic method</exception>
+        public static object Call(object caller, string functionName, BindingFlags bindingFlags, Type genericParameter, Type secondGenericParameter,params object[] parameters) => 
+            GetGenericMethod(caller, functionName, bindingFlags, genericParameter, secondGenericParameter).InvokeGenericMethod(caller, parameters);
+
+        /// <summary>
+        /// Call a generic method asynchronously without generic type parameters
+        /// </summary>
+        /// <param name="caller">The caller of the method</param>
+        /// <param name="functionName">The name of the method to call</param>
+        /// <param name="bindingFlags">The <see cref="BindingFlags"/> to find the method</param>
+        /// <param name="genericParameter">The generic parameter as <see cref="Type"/> parameter</param>
+        /// <param name="parameters">The parameters of the method</param>
+        /// <returns>The result of invoking the method</returns>
+        /// <exception cref="GenericMethodNotFoundException">Could not find the generic method</exception>
+        /// <exception cref="Exception">Any <see cref="Exception"/> thrown after invoking the generic method</exception>
+        public static async Task<object> CallAsync(object caller, string functionName, BindingFlags bindingFlags, Type genericParameter, params object[] parameters) => 
+            await GetGenericMethod(caller, functionName, bindingFlags, genericParameter).InvokeGenericMethodAsync(caller, parameters);
+
+        /// <summary>
+        /// Call a generic method asynchronously without generic type parameters
+        /// </summary>
+        /// <param name="caller">The caller of the method</param>
+        /// <param name="functionName">The name of the method to call</param>
+        /// <param name="bindingFlags">The <see cref="BindingFlags"/> to find the method</param>
+        /// <param name="genericParameter">The generic parameter as <see cref="Type"/> parameter</param>
+        /// <param name="secondGenericParameter"></param>
+        /// <param name="parameters">The parameters of the method</param>
+        /// <returns>The result of invoking the method</returns>
+        /// <exception cref="GenericMethodNotFoundException">Could not find the generic method</exception>
+        /// <exception cref="Exception">Any <see cref="Exception"/> thrown after invoking the generic method</exception>
+        public static async Task<object> CallAsync(object caller, string functionName, BindingFlags bindingFlags, Type genericParameter, Type secondGenericParameter, params object[] parameters) => 
+            await GetGenericMethod(caller, functionName, bindingFlags, genericParameter, secondGenericParameter).InvokeGenericMethodAsync(caller, parameters);
+
+        private static MethodInfo GetGenericMethod(object caller, string functionName, BindingFlags bindingFlags, params Type[] genericParameters)
+        {
+            MethodInfo genericMethod = caller.GetType().GetMethod(functionName, bindingFlags)?.MakeGenericMethod(genericParameters);
+            
+            if (genericMethod == null)
+                throw new GenericMethodNotFoundException(functionName);
+
+            return genericMethod;
+        }
+
+        private static object InvokeGenericMethod(this MethodInfo genericMethod, object caller, params object[] parameters)
+        {
+            try //exceptions thrown by methods called with invoke are wrapped into another exception, the exception thrown by the invoked method can be returned by `Exception.GetBaseException()`
+            {
+                return genericMethod.Invoke(caller, parameters);
+            }
+            catch (Exception ex)
+            {
+                throw ex.GetBaseException();
+            }
+        }
+
+        private static async Task<object> InvokeGenericMethodAsync(this MethodInfo genericMethod, object caller, params object[] parameters)
+        {
+            try //exceptions thrown by methods called with invoke are wrapped into another exception, the exception thrown by the invoked method can be returned by `Exception.GetBaseException()`
+            {
+                dynamic awaitable = genericMethod.Invoke(caller, parameters);
+                await awaitable;
+                return awaitable.GetAwaiter().GetResult();
+            }
+            catch (Exception ex)
+            {
+                throw ex.GetBaseException();
+            }
+        }
+    }
+}

GBase/Installers/DataHandlingInstaller.cs

@@ -7,8 +7,13 @@ using GBase.DataHandling;
 using GBase.DataHandling.Cache;
 using GBase.DataHandling.Cache.Factories;
 using GBase.DataHandling.Factories;
+using GBase.DataHandling.Factories.Pool;
+using GBase.DataHandling.Pool;
+using GBase.Interfaces.DataHandling;
+using GBase.Interfaces.DataHandling.Pool;
 using GBase.Interfaces.DataHandling.Xml;
 using GBase.Interfaces.DataHandling.Xml.Cache;
+using LightweightIocContainer;
 using LightweightIocContainer.Interfaces;
 using LightweightIocContainer.Interfaces.Installers;
 
@@ -22,16 +27,23 @@ namespace GBase.Installers
         /// <inheritdoc />
         public void Install(IIocContainer container)
         {
-            container.Register<IXmlDataHandler, XmlDataHandler>();
-            container.Register<IXmlDataReader, XmlDataReader>();
-            container.Register<IXmlDataWriter, XmlDataWriter>();
+            container.Register<IDataHandler, IXmlDataHandler, XmlDataHandler>();
+            container.Register<IDataReader, IXmlDataReader, XmlDataReader>();
+            container.Register<IDataWriter, IXmlDataWriter, XmlDataWriter>();
 
             //cache
             container.Register<IXmlDataHandlerCache, XmlDataHandlerCache>();
             container.Register<IXmlDataHandlerCacheEntry, XmlDataHandlerCacheEntry>();
             container.Register<IXmlDataHandlerCachePropertyEntry, XmlDataHandlerCachePropertyEntry>();
 
+            //pool
+            container.Register<IDataHandlerPool, DataHandlerPool>(Lifestyle.Singleton).WithParameters(10);
+            container.Register<IPoolRequest, PoolRequest>();
+            container.Register<IPoolItemFactory, PoolItemFactory>();
+            container.RegisterFactory<IPoolRequestFactory>();
+            
             //factories
+            container.RegisterFactory<IDataHandlerFactory>();
             container.RegisterFactory<IXmlDataHandlerFactory>();
             container.RegisterFactory<IXmlDataReaderFactory>();
             container.RegisterFactory<IXmlDataWriterFactory>();

GBase/Installers/GBaseInstaller.cs

@@ -5,6 +5,7 @@
 
 using GBase.Factories;
 using GBase.Interfaces;
+using LightweightIocContainer;
 using LightweightIocContainer.Interfaces;
 using LightweightIocContainer.Interfaces.Installers;
 
@@ -18,13 +19,12 @@ namespace GBase.Installers
         /// <inheritdoc />
         public void Install(IIocContainer container)
         {
-            container.Register<IGBase, GBase>();
-            container.Register<IGBaseTable, GBaseTable>();
+            container.Register<IGBase, GBase>(Lifestyle.Singleton);
             container.Register<IGBaseColumn, GBaseColumn>();
 
             //factories
             container.RegisterFactory<IGBaseFactory>();
-            container.RegisterFactory<IGBaseTableFactory>();
+            container.Register<IGBaseTableFactory, GBaseTableFactory>(); //TODO: Once LightweightIocContainer can handle open generic registrations this can be changed back again
             container.RegisterFactory<IGBaseColumnFactory>();
         }
     }

GBase/Interfaces/DataHandling/Cache/IDataHandlerCache.cs

@@ -4,6 +4,8 @@
 
 using System;
 using System.Collections.Generic;
+using System.IO;
+using System.Threading;
 using System.Threading.Tasks;
 
 namespace GBase.Interfaces.DataHandling.Cache
@@ -39,8 +41,10 @@ namespace GBase.Interfaces.DataHandling.Cache
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> that implements the property</typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
         /// <param name="propertyName">The name of the property</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>An <see cref="IEnumerable{T}"/> with all the values for the property</returns>
-        Task<IEnumerable<TProperty>> TryGetValues<T, TProperty>(string propertyName);
+        Task<IEnumerable<TProperty>> TryGetValues<T, TProperty>(FileStream file, string propertyName, CancellationToken cancellationToken);
     }
 }

GBase/Interfaces/DataHandling/IDataHandler.cs

@@ -4,6 +4,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -12,52 +13,63 @@ namespace GBase.Interfaces.DataHandling
     /// <summary>
     /// Interface for data handlers to implement
     /// </summary>
-    public interface IDataHandler : IAsyncDisposable
+    public interface IDataHandler
     {
         /// <summary>
         /// Initialize the <see cref="IDataHandler"/>
         /// </summary>
         /// <param name="overwrite">If true an existing value is overwritten, if false an additional value is added</param>
-        /// <param name="cancellationToken">A <see cref="CancellationToken"/> to cancel the async operation</param>
         /// <returns>Returns true if successful, false if not</returns>
-        Task<bool> Init(bool overwrite, CancellationToken cancellationToken);
+        bool Init(bool overwrite);
+
+        Task<bool> AddEntry<T>(T entry, IGBaseTable table, FileStream entryFile, CancellationToken cancellationToken);
+
+        Task<bool> RemoveEntry<T>(T entry);
 
         /// <summary>
         /// Set the value for the given property
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="entryFile"></param>
         /// <param name="propertyName">The name of the property</param>
         /// <param name="value">The value to set</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>A <see cref="Task"/> to await</returns>
-        Task SetValue<T, TProperty>(string propertyName, TProperty value);
+        Task SetValue<T, TProperty>(FileStream entryFile, string propertyName, TProperty value, CancellationToken cancellationToken);
 
         /// <summary>
         /// Remove the value for the given property
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="entryFile"></param>
         /// <param name="propertyName">The name of the property</param>
         /// <param name="value">The value to set</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>A <see cref="Task"/> to await</returns>
-        Task RemoveValue<T, TProperty>(string propertyName, TProperty value);
+        Task RemoveValue<T, TProperty>(FileStream entryFile, string propertyName, TProperty value, CancellationToken cancellationToken);
 
         /// <summary>
         /// Get the value for the given property, if multiple values are set the first is returned
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
         /// <param name="propertyName">The name of the property</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>The value for the given property</returns>
-        Task<TProperty> GetValue<T, TProperty>(string propertyName);
+        Task<TProperty> GetValue<T, TProperty>(FileStream file, string propertyName, CancellationToken cancellationToken);
 
         /// <summary>
         /// Get all the values that are set for the given property
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
         /// <param name="propertyName">The name of the property</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>An <see cref="IEnumerable{T}"/> with all the values for the property</returns>
-        Task<IEnumerable<TProperty>> GetValues<T, TProperty>(string propertyName);
+        Task<IEnumerable<TProperty>> GetValues<T, TProperty>(FileStream file, string propertyName, CancellationToken cancellationToken);
     }
 }

GBase/Interfaces/DataHandling/IDataReader.cs

@@ -4,6 +4,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -12,22 +13,17 @@ namespace GBase.Interfaces.DataHandling
     /// <summary>
     /// Interface for data readers to implement
     /// </summary>
-    public interface IDataReader : IAsyncDisposable
+    public interface IDataReader
     {
-        /// <summary>
-        /// Initialize the <see cref="IDataReader"/>
-        /// </summary>
-        /// <param name="cancellationToken">A <see cref="CancellationToken"/> to cancel the async operation</param>
-        /// <returns>Returns true if successful, false if not</returns>
-        Task<bool> Init(CancellationToken cancellationToken);
-
         /// <summary>
         /// Read the data of a property
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/></typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
         /// <param name="propertyName">The name of the property</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>The data of the given property, null if no data found</returns>
-        Task<IEnumerable<TProperty>> Read<T, TProperty>(string propertyName);
+        Task<IEnumerable<TProperty>> Read<T, TProperty>(FileStream file, string propertyName, CancellationToken cancellationToken);
     }
 }

GBase/Interfaces/DataHandling/IDataWriter.cs

@@ -3,6 +3,7 @@
 // Copyright(c) 2020 SimonG. All Rights Reserved.
 
 using System;
+using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -11,34 +12,53 @@ namespace GBase.Interfaces.DataHandling
     /// <summary>
     /// Interface for data writers to implement
     /// </summary>
-    public interface IDataWriter : IAsyncDisposable
+    public interface IDataWriter
     {
         /// <summary>
         /// Initialize the <see cref="IDataWriter"/>
         /// </summary>
+        /// <param name="file"></param>
+        /// <param name="rootElementName"></param>
         /// <param name="cancellationToken">A <see cref="CancellationToken"/> to cancel the async operation</param>
         /// <returns>Returns true if successful, false if not</returns>
-        Task<bool> Init(CancellationToken cancellationToken);
+        Task InitFile(FileStream file, string rootElementName, CancellationToken cancellationToken);
 
         /// <summary>
         /// Write the data of a property
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/></typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
         /// <param name="propertyName">The name of the property</param>
         /// <param name="value">The value of the property</param>
         /// <param name="overwrite">If true an existing value is overwritten, if false an additional value is added</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>A <see cref="Task"/> to await</returns>
-        Task Write<T, TProperty>(string propertyName, string value, bool overwrite);
+        Task Write<T, TProperty>(FileStream file, string propertyName, string value, bool overwrite, CancellationToken cancellationToken);
+        
+        /// <summary>
+        /// Write the data of a property
+        /// </summary>
+        /// <typeparam name="T">The <see cref="Type"/></typeparam>
+        /// <param name="file"></param>
+        /// <param name="propertyName">The name of the property</param>
+        /// <param name="value">The value of the property</param>
+        /// <param name="propertyType"></param>
+        /// <param name="overwrite">If true an existing value is overwritten, if false an additional value is added</param>
+        /// <param name="cancellationToken"></param>
+        /// <returns>A <see cref="Task"/> to await</returns>
+        Task Write<T>(FileStream file, string propertyName, string value, Type propertyType, bool overwrite, CancellationToken cancellationToken);
 
         /// <summary>
         /// Remove the value for the given property
         /// </summary>
         /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
         /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
+        /// <param name="file"></param>
         /// <param name="propertyName">The name of the property</param>
         /// <param name="value">The value to set</param>
+        /// <param name="cancellationToken"></param>
         /// <returns>A <see cref="Task"/> to await</returns>
-        Task Remove<T, TProperty>(string propertyName, string value);
+        Task Remove<T, TProperty>(FileStream file, string propertyName, string value, CancellationToken cancellationToken);
     }
 }

GBase/Interfaces/DataHandling/Pool/IDataHandlerPool.cs

@@ -0,0 +1,15 @@
+// Author: Simon Gockner
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace GBase.Interfaces.DataHandling.Pool
+{
+    public interface IDataHandlerPool : IAsyncDisposable
+    {
+        Task<IPoolItem<IDataHandler>> RequestDataHandler(object requester, bool overwrite, CancellationToken cancellationToken);
+    }
+}

GBase/Interfaces/DataHandling/Pool/IPoolItem.cs

@@ -0,0 +1,16 @@
+// Author: Simon Gockner
+// Created: 2020-09-19
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace GBase.Interfaces.DataHandling.Pool
+{
+    public interface IPoolItem<T> : IDisposable
+    {
+        T Item { get; }
+        bool InUse { get; }
+
+        T Use();
+    }
+}

GBase/Interfaces/DataHandling/Pool/IPoolRequest.cs

@@ -0,0 +1,14 @@
+// Author: Simon Gockner
+// Created: 2020-09-19
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+using System.Threading.Tasks;
+
+namespace GBase.Interfaces.DataHandling.Pool
+{
+    public interface IPoolRequest
+    {
+        object Requester { get; }
+    }
+}

GBase/Interfaces/FileHandling/IFileHandler.cs

@@ -6,6 +6,7 @@ using System;
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
+using GBase.Api;
 
 namespace GBase.Interfaces.FileHandling
 {
@@ -18,46 +19,15 @@ namespace GBase.Interfaces.FileHandling
         /// Initialize this <see cref="IFileHandler"/>
         /// </summary>
         /// <param name="path">The path of the database</param>
+        /// <param name="folderName"></param>
         /// <param name="cancellationToken">A <see cref="CancellationToken"/> to cancel the asynchronous operation</param>
         /// <returns>True if successful, false if not</returns>
-        Task<bool> Init(string path, CancellationToken cancellationToken);
+        List<IGBaseFile> Init(string path, string folderName, CancellationToken cancellationToken);
 
-        /// <summary>
-        /// Set the value for the given property
-        /// </summary>
-        /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
-        /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
-        /// <param name="propertyName">The name of the property</param>
-        /// <param name="value">The value to set</param>
-        /// <returns>A <see cref="Task"/> to await</returns>
-        Task SetValue<T, TProperty>(string propertyName, TProperty value);
+        IGBaseFile CreateEntryFile<T>(T entry, IGBaseTable table) where T : IGBaseObject;
 
-        /// <summary>
-        /// Remove the value for the given property
-        /// </summary>
-        /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
-        /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
-        /// <param name="propertyName">The name of the property</param>
-        /// <param name="value">The value to set</param>
-        /// <returns>A <see cref="Task"/> to await</returns>
-        Task RemoveValue<T, TProperty>(string propertyName, TProperty value);
+        Task<bool> DeleteEntryFile<T>(T entry);
 
-        /// <summary>
-        /// Get the value for the given property, if multiple values are set the first is returned
-        /// </summary>
-        /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
-        /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
-        /// <param name="propertyName">The name of the property</param>
-        /// <returns>The value for the given property</returns>
-        Task<TProperty> GetValue<T, TProperty>(string propertyName);
-
-        /// <summary>
-        /// Get all the values that are set for the given property
-        /// </summary>
-        /// <typeparam name="T">The <see cref="Type"/> of the property</typeparam>
-        /// <typeparam name="TProperty">The <see cref="Type"/> of the property</typeparam>
-        /// <param name="propertyName">The name of the property</param>
-        /// <returns>An <see cref="IEnumerable{T}"/> with all the values for the property</returns>
-        Task<IEnumerable<TProperty>> GetValues<T, TProperty>(string propertyName);
+        Task<IGBaseFile> RequestEntryFile<T>(T entry);
     }
 }

GBase/Interfaces/FileHandling/IGBaseFile.cs

@@ -0,0 +1,19 @@
+// Author: Gockner, Simon
+// Created: 2020-11-10
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+using System.IO;
+
+namespace GBase.Interfaces.FileHandling
+{
+    public interface IGBaseFile : IDisposable
+    {
+        object Entry { get; set; }
+        FileStream File { get; }
+        string FilePath { get; }
+        bool InUse { get; }
+
+        IGBaseFile UseFile();
+    }
+}

GBase/Interfaces/IGBase.cs

@@ -48,11 +48,20 @@ namespace GBase.Interfaces
         /// <returns>True if successful, false if not</returns>
         bool AddTable(IGBaseTable table);
 
+        IGBaseTable<T> GetTable<T>() where T : IGBaseObject, new();
+
         /// <summary>
         /// Removes a given <see cref="IGBaseTable"/> from this <see cref="IGBase"/>
         /// </summary>
         /// <param name="table">The given <see cref="IGBaseTable"/></param>
         /// <returns>True if successful, false if not</returns>
         bool RemoveTable(IGBaseTable table);
+
+        Task<bool> AddEntry<T>(T entry, CancellationToken cancellationToken) where T : IGBaseObject, new();
+        T GetEntryForKey<T>(int key) where T : IGBaseObject, new();
+
+        Task SetValue<T, TProperty>(T entry, string propertyName, TProperty value, CancellationToken cancellationToken) where T : IGBaseObject, new();
+        Task<TProperty> GetValue<T, TProperty>(T entry, string propertyName, CancellationToken cancellationToken) where T : IGBaseObject, new();
+        Task<IEnumerable<TProperty>> GetValues<T, TProperty>(T entry, string propertyName, CancellationToken cancellationToken) where T : IGBaseObject, new();
     }
 }

GBase/Interfaces/IGBaseColumn.cs

@@ -9,8 +9,10 @@ namespace GBase.Interfaces
     /// <summary>
     /// A column of a <see cref="IGBaseTable"/>
     /// </summary>
-    public interface IGBaseColumn : IAsyncDisposable //TODO: Make column generic (generic type is type of the value of the column?)?
+    public interface IGBaseColumn : IAsyncDisposable
     {
-        
+        string Name { get; }
+        Type Type { get; }
+        bool IsKey { get; }
     }
 }

GBase/Interfaces/IGBaseObject.cs

@@ -0,0 +1,29 @@
+// Author: Gockner, Simon
+// Created: 2020-02-14
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+using System.Collections.Generic;
+using GBase.Attributes;
+
+namespace GBase.Interfaces
+{
+    /// <summary>
+    /// GBase object that allows conversion from <see cref="string"/>
+    /// </summary>
+    public interface IGBaseObject
+    {
+        /// <summary>
+        /// <see cref="IGBase"/> Key
+        /// </summary>
+        [GBaseColumn(true)]
+        GBaseKey Key { get; set; }
+        
+        /// <summary>
+        /// The FileName of the GBase file for an entry of this object
+        /// </summary>
+        string FileName { get; }
+        
+        void Initialize(GBaseKey key, List<object> parameters);
+    }
+}

GBase/Interfaces/IGBaseTable.cs

@@ -6,14 +6,44 @@ using System;
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
-using GBase.Api;
 
 namespace GBase.Interfaces
 {
+    public interface IGBaseTable<T> : IGBaseTable where T : IGBaseObject, new()
+    {
+        /// <summary>
+        /// The entries of this <see cref="IGBaseTable"/>
+        /// </summary>
+        List<T> Entries { get; }
+
+        /// <summary>
+        /// Add an entry that implements <see cref="IGBaseObject"/> to this <see cref="IGBaseTable"/>
+        /// </summary>
+        /// <param name="entry">The entry implementing <see cref="IGBaseObject"/></param>
+        /// <param name="cancellationToken"></param>
+        /// <returns>True if successful, false if not</returns>
+        Task<bool> AddEntry(T entry, CancellationToken cancellationToken);
+
+        T GetEntryForKey(int key);
+
+        /// <summary>
+        /// Remove an entry that implements <see cref="IGBaseObject"/> from this <see cref="IGBaseTable"/>
+        /// </summary>
+        /// <param name="entry">The entry implementing <see cref="IGBaseObject"/></param>
+        /// <returns>True if successful, false if not</returns>
+        Task<bool> RemoveEntry(T entry);
+
+        Task SetValue<TProperty>(T entry, string propertyName, TProperty value, CancellationToken cancellationToken);
+
+        Task<TProperty> GetValue<TProperty>(T entry, string propertyName, CancellationToken cancellationToken);
+
+        Task<IEnumerable<TProperty>> GetValues<TProperty>(T entry, string propertyName, CancellationToken cancellationToken);
+    }
+    
     /// <summary>
     /// A <see cref="IGBase"/> table
     /// </summary>
-    public interface IGBaseTable : IAsyncDisposable //TODO: make generic?
+    public interface IGBaseTable : IAsyncDisposable
     {
         /// <summary>
         /// The <see cref="System.Type"/> of the class that this <see cref="IGBaseTable"/> represents
@@ -23,27 +53,23 @@ namespace GBase.Interfaces
         /// <summary>
         /// The name of this <see cref="IGBaseTable"/>
         /// </summary>
-        string Name { get; }
+        string FolderName { get; }
 
         /// <summary>
         /// The <see cref="IGBaseColumn"/>s of this <see cref="IGBaseTable"/>
         /// </summary>
         List<IGBaseColumn> Columns { get; }
 
-        /// <summary>
-        /// The entries of this <see cref="IGBaseTable"/>
-        /// </summary>
-        List<object> Entries { get; }
-
         /// <summary>
         /// Initialize this <see cref="IGBase"/>
         /// </summary>
         /// <param name="type">The <see cref="System.Type"/> of the class that this <see cref="IGBaseTable"/> represents</param>
-        /// <param name="name">The name of this <see cref="IGBaseTable"/></param>
-        /// /// <param name="databasePath">The path to the database files</param>
+        /// <param name="databasePath">The path to the database files</param>
+        /// <param name="folderName"></param>
         /// <param name="cancellationToken">A <see cref="CancellationToken"/> to cancel the asynchronous operation</param>
+        /// ///
         /// <returns>True if successful, false if not</returns>
-        Task<bool> Init(Type type, string name, string databasePath, CancellationToken cancellationToken);
+        Task Init(Type type, string databasePath, string folderName, CancellationToken cancellationToken);
 
         /// <summary>
         /// Add a given <see cref="IGBaseColumn"/> to this <see cref="IGBaseTable"/>
@@ -58,19 +84,5 @@ namespace GBase.Interfaces
         /// <param name="column">The given <see cref="IGBaseColumn"/></param>
         /// <returns>True if successful, false if not</returns>
         bool RemoveColumn(IGBaseColumn column);
-
-        /// <summary>
-        /// Add an entry that implements <see cref="INotifyGBaseEntryChanged"/> to this <see cref="IGBaseTable"/>
-        /// </summary>
-        /// <param name="entry">The entry implementing <see cref="INotifyGBaseEntryChanged"/></param>
-        /// <returns>True if successful, false if not</returns>
-        bool AddEntry(INotifyGBaseEntryChanged entry);
-
-        /// <summary>
-        /// Remove an entry that implements <see cref="INotifyGBaseEntryChanged"/> from this <see cref="IGBaseTable"/>
-        /// </summary>
-        /// <param name="entry">The entry implementing <see cref="INotifyGBaseEntryChanged"/></param>
-        /// <returns>True if successful, false if not</returns>
-        bool RemoveEntry(INotifyGBaseEntryChanged entry);
     }
 }

GBaseStructure.md

@@ -0,0 +1,41 @@
+# GBase Structure
+
+```md
+- GBase
+  |
+  +-GBaseTable
+  |
+  |
+  +-GBaseTable
+    |
+    +-GBaseColumn--GBaseColumn--GBaseColumn
+    +-GBaseEntry
+    +-GBaseEntry
+```
+
+## Terminology
+
+| GBase Terminology | C# equivalent |
+|-------------------|---------------|
+| GBaseTable        | Type          |
+| GBaseColumn       | Property      |
+| GBaseEntry        | Instance      |
+
+## Xml File Structure
+
+```xml
+<Table>
+  <Column>
+    <Value >
+    <Value >
+  </Column>
+</Table>
+```
+
+## Process
+
+### StartUp
+
+### GetValue
+
+### SetValue

README.md

@@ -1,3 +1,5 @@
 # GBase
 
 A database based on .net
+
+[![Build Status](https://drone.gockn3r.com/api/badges/SimonG/GBase/status.svg)](https://drone.gockn3r.com/SimonG/GBase)

Test.GBase/DataHandling/XmlDataHandlerLocalIntegrationTest.cs

@@ -3,12 +3,14 @@
 // Copyright(c) 2020 SimonG. All Rights Reserved.
 
 using System;
+using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 using GBase.DataHandling;
 using GBase.DataHandling.Cache;
 using GBase.DataHandling.Cache.Factories;
 using GBase.DataHandling.Factories;
+using GBase.Interfaces;
 using GBase.Interfaces.DataHandling.Xml;
 using Moq;
 using NUnit.Framework;
@@ -27,12 +29,12 @@ namespace Test.GBase.DataHandling
             Assert.Pass(); //Remove this assert.pass() if you want to run this test locally
 
             Mock<IXmlDataWriterFactory> dataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            dataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>()))
-                .Returns((string path, string rootElementName) => new XmlDataWriter(path, rootElementName));
+            dataWriterFactoryMock.Setup(w => w.Create())
+                .Returns(new XmlDataWriter());
 
             Mock<IXmlDataReaderFactory> dataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            dataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>()))
-                .Returns((string path) => new XmlDataReader(path));
+            dataReaderFactoryMock.Setup(r => r.Create())
+                .Returns(new XmlDataReader(Mock.Of<IGBase>()));
 
             Mock<IXmlDataHandlerCachePropertyEntryFactory> dataHandlerCachePropertyEntryFactoryMock = new Mock<IXmlDataHandlerCachePropertyEntryFactory>();
             dataHandlerCachePropertyEntryFactoryMock.Setup(p => p.Create(It.IsAny<string>(), It.IsAny<object>()))
@@ -48,21 +50,22 @@ namespace Test.GBase.DataHandling
                 .Returns((IXmlDataReader xmlDataReader) =>
                     new XmlDataHandlerCache(xmlDataReader, dataHandlerCacheEntryFactoryMock.Object, dataHandlerCachePropertyEntryFactoryMock.Object));
 
-            IXmlDataHandler xmlDataHandler = new XmlDataHandler("TestXml.xml", "Properties", dataReaderFactoryMock.Object, dataWriterFactoryMock.Object,
-                dataHandlerCacheFactoryMock.Object);
+            IXmlDataHandler xmlDataHandler = new XmlDataHandler(dataReaderFactoryMock.Object, dataWriterFactoryMock.Object, dataHandlerCacheFactoryMock.Object);
+
+            xmlDataHandler.Init(false);
+            
+            FileStream file = null; //FixMe: init this correctly if you want to run this test
             
-            await xmlDataHandler.Init(false, new CancellationToken());
-            //
             //await xmlDataHandler.SetValue<XmlDataHandlerLocalIntegrationTest, string>(nameof(TestProperty), TestProperty);
             //await xmlDataHandler.SetValue<XmlDataHandlerLocalIntegrationTest, string>(nameof(TestProperty), "empty");
-            await xmlDataHandler.SetValue<XmlDataHandlerLocalIntegrationTest, string>(nameof(TestProperty), "test");
+            await xmlDataHandler.SetValue<XmlDataHandlerLocalIntegrationTest, string>(file, nameof(TestProperty), "test", new CancellationToken());
             //await xmlDataHandler.SetValue<XmlDataHandlerLocalIntegrationTest, string>(nameof(TestProperty), "OverwrittenString");
             //
-            await xmlDataHandler.SetValue<XmlDataHandlerLocalIntegrationTest, int>(nameof(TestInt), 1);
+            await xmlDataHandler.SetValue<XmlDataHandlerLocalIntegrationTest, int>(file, nameof(TestInt), 1, new CancellationToken());
             //await xmlDataHandler.SetValue<XmlDataHandlerLocalIntegrationTest, int>(nameof(TestInt), 2);
             //await xmlDataHandler.SetValue<XmlDataHandlerLocalIntegrationTest, int>(nameof(TestInt), 3);
-            TestProperty = await xmlDataHandler.GetValue<XmlDataHandlerLocalIntegrationTest, string>(nameof(TestProperty));
-            TestInt = await xmlDataHandler.GetValue<XmlDataHandlerLocalIntegrationTest, int>(nameof(TestInt));
+            TestProperty = await xmlDataHandler.GetValue<XmlDataHandlerLocalIntegrationTest, string>(file, nameof(TestProperty), new CancellationToken());
+            TestInt = await xmlDataHandler.GetValue<XmlDataHandlerLocalIntegrationTest, int>(file, nameof(TestInt), new CancellationToken());
         }
     }
 }

Test.GBase/DataHandling/XmlDataHandlerTest.cs

@@ -19,104 +19,45 @@ namespace Test.GBase.DataHandling
     public class XmlDataHandlerTest
     {
         [Test]
-        public async Task TestInit()
+        public void TestInit()
         {
             Mock<IXmlDataReader> xmlDataReaderMock = new Mock<IXmlDataReader>();
-            xmlDataReaderMock.Setup(r => r.Init(It.IsAny<CancellationToken>())).ReturnsAsync(true);
-
             Mock<IXmlDataReaderFactory> xmlDataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            xmlDataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>())).Returns(xmlDataReaderMock.Object);
+            xmlDataReaderFactoryMock.Setup(r => r.Create()).Returns(xmlDataReaderMock.Object);
 
             Mock<IXmlDataWriter> xmlDataWriterMock = new Mock<IXmlDataWriter>();
-            xmlDataWriterMock.Setup(w => w.Init(It.IsAny<CancellationToken>())).ReturnsAsync(true);
-
-            Mock<IXmlDataWriterFactory> xmlDataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            xmlDataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>())).Returns(xmlDataWriterMock.Object);
-
-            Mock<IXmlDataHandlerCache> xmlDataHandlerCacheMock = new Mock<IXmlDataHandlerCache>();
-            Mock<IXmlDataHandlerCacheFactory> xmlDataHandlerCacheFactoryMock = new Mock<IXmlDataHandlerCacheFactory>();
-            xmlDataHandlerCacheFactoryMock.Setup(c => c.Create(It.IsAny<IXmlDataReader>())).Returns(xmlDataHandlerCacheMock.Object);
-
-            XmlDataHandler xmlDataHandler = new XmlDataHandler("path", "root", xmlDataReaderFactoryMock.Object,
-                xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
-
-            Assert.True(await xmlDataHandler.Init(false, CancellationToken.None));
-        }
-
-        [Test]
-        public async Task TestInitFailedTriedTwice()
-        {
-            Mock<IXmlDataReader> xmlDataReaderMock = new Mock<IXmlDataReader>();
-            xmlDataReaderMock.Setup(r => r.Init(It.IsAny<CancellationToken>())).ReturnsAsync(true);
-
-            Mock<IXmlDataReaderFactory> xmlDataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            xmlDataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>())).Returns(xmlDataReaderMock.Object);
-
-            Mock<IXmlDataWriter> xmlDataWriterMock = new Mock<IXmlDataWriter>();
-            xmlDataWriterMock.Setup(w => w.Init(It.IsAny<CancellationToken>())).ReturnsAsync(true);
-
             Mock<IXmlDataWriterFactory> xmlDataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            xmlDataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>())).Returns(xmlDataWriterMock.Object);
+            xmlDataWriterFactoryMock.Setup(w => w.Create()).Returns(xmlDataWriterMock.Object);
 
             Mock<IXmlDataHandlerCache> xmlDataHandlerCacheMock = new Mock<IXmlDataHandlerCache>();
             Mock<IXmlDataHandlerCacheFactory> xmlDataHandlerCacheFactoryMock = new Mock<IXmlDataHandlerCacheFactory>();
             xmlDataHandlerCacheFactoryMock.Setup(c => c.Create(It.IsAny<IXmlDataReader>())).Returns(xmlDataHandlerCacheMock.Object);
 
-            XmlDataHandler xmlDataHandler = new XmlDataHandler("path", "root", xmlDataReaderFactoryMock.Object,
-                xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
+            XmlDataHandler xmlDataHandler = new XmlDataHandler(xmlDataReaderFactoryMock.Object, xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
 
-            Assert.True(await xmlDataHandler.Init(false, CancellationToken.None));
-            Assert.False(await xmlDataHandler.Init(false, CancellationToken.None));
+            Assert.True(xmlDataHandler.Init(false));
         }
 
         [Test]
-        public async Task TestInitFailedInitReaderFailed()
+        public void TestInitFailedTriedTwice()
         {
             Mock<IXmlDataReader> xmlDataReaderMock = new Mock<IXmlDataReader>();
-            xmlDataReaderMock.Setup(r => r.Init(It.IsAny<CancellationToken>())).ReturnsAsync(false);
 
             Mock<IXmlDataReaderFactory> xmlDataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            xmlDataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>())).Returns(xmlDataReaderMock.Object);
+            xmlDataReaderFactoryMock.Setup(r => r.Create()).Returns(xmlDataReaderMock.Object);
 
             Mock<IXmlDataWriter> xmlDataWriterMock = new Mock<IXmlDataWriter>();
-            xmlDataWriterMock.Setup(w => w.Init(It.IsAny<CancellationToken>())).ReturnsAsync(true);
-
-            Mock<IXmlDataWriterFactory> xmlDataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            xmlDataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>())).Returns(xmlDataWriterMock.Object);
-
-            Mock<IXmlDataHandlerCache> xmlDataHandlerCacheMock = new Mock<IXmlDataHandlerCache>();
-            Mock<IXmlDataHandlerCacheFactory> xmlDataHandlerCacheFactoryMock = new Mock<IXmlDataHandlerCacheFactory>();
-            xmlDataHandlerCacheFactoryMock.Setup(c => c.Create(It.IsAny<IXmlDataReader>())).Returns(xmlDataHandlerCacheMock.Object);
-
-            XmlDataHandler xmlDataHandler = new XmlDataHandler("path", "root", xmlDataReaderFactoryMock.Object,
-                xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
-
-            Assert.False(await xmlDataHandler.Init(false, CancellationToken.None));
-        }
-
-        [Test]
-        public async Task TestInitFailedInitWriterFailed()
-        {
-            Mock<IXmlDataReader> xmlDataReaderMock = new Mock<IXmlDataReader>();
-            xmlDataReaderMock.Setup(r => r.Init(It.IsAny<CancellationToken>())).ReturnsAsync(true);
-
-            Mock<IXmlDataReaderFactory> xmlDataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            xmlDataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>())).Returns(xmlDataReaderMock.Object);
-
-            Mock<IXmlDataWriter> xmlDataWriterMock = new Mock<IXmlDataWriter>();
-            xmlDataWriterMock.Setup(w => w.Init(It.IsAny<CancellationToken>())).ReturnsAsync(false);
-
             Mock<IXmlDataWriterFactory> xmlDataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            xmlDataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>())).Returns(xmlDataWriterMock.Object);
+            xmlDataWriterFactoryMock.Setup(w => w.Create()).Returns(xmlDataWriterMock.Object);
 
             Mock<IXmlDataHandlerCache> xmlDataHandlerCacheMock = new Mock<IXmlDataHandlerCache>();
             Mock<IXmlDataHandlerCacheFactory> xmlDataHandlerCacheFactoryMock = new Mock<IXmlDataHandlerCacheFactory>();
             xmlDataHandlerCacheFactoryMock.Setup(c => c.Create(It.IsAny<IXmlDataReader>())).Returns(xmlDataHandlerCacheMock.Object);
 
-            XmlDataHandler xmlDataHandler = new XmlDataHandler("path", "root", xmlDataReaderFactoryMock.Object,
-                xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
+            XmlDataHandler xmlDataHandler = new XmlDataHandler(xmlDataReaderFactoryMock.Object, xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
 
-            Assert.False(await xmlDataHandler.Init(false, CancellationToken.None));
+            Assert.True(xmlDataHandler.Init(false));
+            Assert.False(xmlDataHandler.Init(false));
         }
 
         [Test]
@@ -124,23 +65,22 @@ namespace Test.GBase.DataHandling
         {
             Mock<IXmlDataReader> xmlDataReaderMock = new Mock<IXmlDataReader>();
             Mock<IXmlDataReaderFactory> xmlDataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            xmlDataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>())).Returns(xmlDataReaderMock.Object);
+            xmlDataReaderFactoryMock.Setup(r => r.Create()).Returns(xmlDataReaderMock.Object);
 
             Mock<IXmlDataWriter> xmlDataWriterMock = new Mock<IXmlDataWriter>();
             Mock<IXmlDataWriterFactory> xmlDataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            xmlDataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>())).Returns(xmlDataWriterMock.Object);
+            xmlDataWriterFactoryMock.Setup(w => w.Create()).Returns(xmlDataWriterMock.Object);
 
             Mock<IXmlDataHandlerCache> xmlDataHandlerCacheMock = new Mock<IXmlDataHandlerCache>();
             Mock<IXmlDataHandlerCacheFactory> xmlDataHandlerCacheFactoryMock = new Mock<IXmlDataHandlerCacheFactory>();
             xmlDataHandlerCacheFactoryMock.Setup(c => c.Create(It.IsAny<IXmlDataReader>())).Returns(xmlDataHandlerCacheMock.Object);
 
-            XmlDataHandler xmlDataHandler = new XmlDataHandler("path", "root", xmlDataReaderFactoryMock.Object,
-                xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
+            XmlDataHandler xmlDataHandler = new XmlDataHandler(xmlDataReaderFactoryMock.Object, xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
 
-            await xmlDataHandler.SetValue<XmlDataHandlerTest, string>("property", "SomeString");
+            await xmlDataHandler.SetValue<XmlDataHandlerTest, string>(null, "property", "SomeString", new CancellationToken());
 
             xmlDataHandlerCacheMock.Verify(c => c.SetValue<XmlDataHandlerTest, string>("property", "SomeString", false), Times.Once);
-            xmlDataWriterMock.Verify(w => w.Write<XmlDataHandlerTest, string>("property", "SomeString", false), Times.Once);
+            xmlDataWriterMock.Verify(w => w.Write<XmlDataHandlerTest, string>(null, "property", "SomeString", false, It.IsAny<CancellationToken>()), Times.Once);
         }
 
         [Test]
@@ -148,24 +88,23 @@ namespace Test.GBase.DataHandling
         {
             Mock<IXmlDataReader> xmlDataReaderMock = new Mock<IXmlDataReader>();
             Mock<IXmlDataReaderFactory> xmlDataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            xmlDataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>())).Returns(xmlDataReaderMock.Object);
+            xmlDataReaderFactoryMock.Setup(r => r.Create()).Returns(xmlDataReaderMock.Object);
 
             Mock<IXmlDataWriter> xmlDataWriterMock = new Mock<IXmlDataWriter>();
             Mock<IXmlDataWriterFactory> xmlDataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            xmlDataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>())).Returns(xmlDataWriterMock.Object);
+            xmlDataWriterFactoryMock.Setup(w => w.Create()).Returns(xmlDataWriterMock.Object);
 
             Mock<IXmlDataHandlerCache> xmlDataHandlerCacheMock = new Mock<IXmlDataHandlerCache>();
             Mock<IXmlDataHandlerCacheFactory> xmlDataHandlerCacheFactoryMock = new Mock<IXmlDataHandlerCacheFactory>();
             xmlDataHandlerCacheFactoryMock.Setup(c => c.Create(It.IsAny<IXmlDataReader>())).Returns(xmlDataHandlerCacheMock.Object);
 
-            XmlDataHandler xmlDataHandler = new XmlDataHandler("path", "root", xmlDataReaderFactoryMock.Object,
-                xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
+            XmlDataHandler xmlDataHandler = new XmlDataHandler(xmlDataReaderFactoryMock.Object, xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
 
             List<string> stringList = new List<string>() {"string", "secondString", "thirdString"};
-            await xmlDataHandler.SetValue<XmlDataHandlerTest, List<string>>("property", stringList);
+            await xmlDataHandler.SetValue<XmlDataHandlerTest, List<string>>(null, "property", stringList, new CancellationToken());
 
             xmlDataHandlerCacheMock.Verify(c => c.SetValue<XmlDataHandlerTest, List<string>>("property", stringList, false), Times.Once);
-            xmlDataWriterMock.Verify(w => w.Write<XmlDataHandlerTest, List<string>>("property", $"{stringList[0]},{stringList[1]},{stringList[2]}", false), Times.Once);
+            xmlDataWriterMock.Verify(w => w.Write<XmlDataHandlerTest, List<string>>(null, "property", $"{stringList[0]},{stringList[1]},{stringList[2]}",false, It.IsAny<CancellationToken>()), Times.Once);
         }
 
         [Test]
@@ -173,23 +112,22 @@ namespace Test.GBase.DataHandling
         {
             Mock<IXmlDataReader> xmlDataReaderMock = new Mock<IXmlDataReader>();
             Mock<IXmlDataReaderFactory> xmlDataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            xmlDataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>())).Returns(xmlDataReaderMock.Object);
+            xmlDataReaderFactoryMock.Setup(r => r.Create()).Returns(xmlDataReaderMock.Object);
 
             Mock<IXmlDataWriter> xmlDataWriterMock = new Mock<IXmlDataWriter>();
             Mock<IXmlDataWriterFactory> xmlDataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            xmlDataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>())).Returns(xmlDataWriterMock.Object);
+            xmlDataWriterFactoryMock.Setup(w => w.Create()).Returns(xmlDataWriterMock.Object);
 
             Mock<IXmlDataHandlerCache> xmlDataHandlerCacheMock = new Mock<IXmlDataHandlerCache>();
             Mock<IXmlDataHandlerCacheFactory> xmlDataHandlerCacheFactoryMock = new Mock<IXmlDataHandlerCacheFactory>();
             xmlDataHandlerCacheFactoryMock.Setup(c => c.Create(It.IsAny<IXmlDataReader>())).Returns(xmlDataHandlerCacheMock.Object);
 
-            XmlDataHandler xmlDataHandler = new XmlDataHandler("path", "root", xmlDataReaderFactoryMock.Object,
-                xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
+            XmlDataHandler xmlDataHandler = new XmlDataHandler(xmlDataReaderFactoryMock.Object, xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
 
-            await xmlDataHandler.SetValue<XmlDataHandlerTest, string>("property", null);
+            await xmlDataHandler.SetValue<XmlDataHandlerTest, string>(null, "property", null, new CancellationToken());
 
             xmlDataHandlerCacheMock.Verify(c => c.SetValue<It.IsValueType, It.IsValueType>(It.IsAny<string>(), It.IsAny<It.IsValueType>(), It.IsAny<bool>()), Times.Never);
-            xmlDataWriterMock.Verify(w => w.Write<It.IsValueType, It.IsValueType>(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<bool>()), Times.Never);
+            xmlDataWriterMock.Verify(w => w.Write<It.IsValueType, It.IsValueType>(null, It.IsAny<string>(), It.IsAny<string>(), It.IsAny<bool>(), It.IsAny<CancellationToken>()), Times.Never);
         }
 
         [Test]
@@ -197,23 +135,22 @@ namespace Test.GBase.DataHandling
         {
             Mock<IXmlDataReader> xmlDataReaderMock = new Mock<IXmlDataReader>();
             Mock<IXmlDataReaderFactory> xmlDataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            xmlDataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>())).Returns(xmlDataReaderMock.Object);
+            xmlDataReaderFactoryMock.Setup(r => r.Create()).Returns(xmlDataReaderMock.Object);
 
             Mock<IXmlDataWriter> xmlDataWriterMock = new Mock<IXmlDataWriter>();
             Mock<IXmlDataWriterFactory> xmlDataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            xmlDataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>())).Returns(xmlDataWriterMock.Object);
+            xmlDataWriterFactoryMock.Setup(w => w.Create()).Returns(xmlDataWriterMock.Object);
 
             Mock<IXmlDataHandlerCache> xmlDataHandlerCacheMock = new Mock<IXmlDataHandlerCache>();
             Mock<IXmlDataHandlerCacheFactory> xmlDataHandlerCacheFactoryMock = new Mock<IXmlDataHandlerCacheFactory>();
             xmlDataHandlerCacheFactoryMock.Setup(c => c.Create(It.IsAny<IXmlDataReader>())).Returns(xmlDataHandlerCacheMock.Object);
 
-            XmlDataHandler xmlDataHandler = new XmlDataHandler("path", "root", xmlDataReaderFactoryMock.Object,
-                xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
+            XmlDataHandler xmlDataHandler = new XmlDataHandler(xmlDataReaderFactoryMock.Object, xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
 
-            await xmlDataHandler.RemoveValue<XmlDataHandlerTest, string>("property", "SomeString");
+            await xmlDataHandler.RemoveValue<XmlDataHandlerTest, string>(null, "property", "SomeString", new CancellationToken());
 
             xmlDataHandlerCacheMock.Verify(c => c.TryRemoveValue<XmlDataHandlerTest, string>("property", "SomeString"), Times.Once);
-            xmlDataWriterMock.Verify(w => w.Remove<XmlDataHandlerTest, string>("property", "SomeString"), Times.Once);
+            xmlDataWriterMock.Verify(w => w.Remove<XmlDataHandlerTest, string>(null, "property", "SomeString", It.IsAny<CancellationToken>()), Times.Once);
         }
 
         [Test]
@@ -221,24 +158,23 @@ namespace Test.GBase.DataHandling
         {
             Mock<IXmlDataReader> xmlDataReaderMock = new Mock<IXmlDataReader>();
             Mock<IXmlDataReaderFactory> xmlDataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            xmlDataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>())).Returns(xmlDataReaderMock.Object);
+            xmlDataReaderFactoryMock.Setup(r => r.Create()).Returns(xmlDataReaderMock.Object);
 
             Mock<IXmlDataWriter> xmlDataWriterMock = new Mock<IXmlDataWriter>();
             Mock<IXmlDataWriterFactory> xmlDataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            xmlDataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>())).Returns(xmlDataWriterMock.Object);
+            xmlDataWriterFactoryMock.Setup(w => w.Create()).Returns(xmlDataWriterMock.Object);
 
             Mock<IXmlDataHandlerCache> xmlDataHandlerCacheMock = new Mock<IXmlDataHandlerCache>();
             Mock<IXmlDataHandlerCacheFactory> xmlDataHandlerCacheFactoryMock = new Mock<IXmlDataHandlerCacheFactory>();
             xmlDataHandlerCacheFactoryMock.Setup(c => c.Create(It.IsAny<IXmlDataReader>())).Returns(xmlDataHandlerCacheMock.Object);
 
-            XmlDataHandler xmlDataHandler = new XmlDataHandler("path", "root", xmlDataReaderFactoryMock.Object,
-                xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
+            XmlDataHandler xmlDataHandler = new XmlDataHandler(xmlDataReaderFactoryMock.Object, xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
 
             List<string> stringList = new List<string>() { "string", "secondString", "thirdString" };
-            await xmlDataHandler.RemoveValue<XmlDataHandlerTest, List<string>>("property", stringList);
+            await xmlDataHandler.RemoveValue<XmlDataHandlerTest, List<string>>(null, "property", stringList, new CancellationToken());
 
             xmlDataHandlerCacheMock.Verify(c => c.TryRemoveValue<XmlDataHandlerTest, List<string>>("property", stringList), Times.Once);
-            xmlDataWriterMock.Verify(w => w.Remove<XmlDataHandlerTest, List<string>>("property", $"{stringList[0]},{stringList[1]},{stringList[2]}"), Times.Once);
+            xmlDataWriterMock.Verify(w => w.Remove<XmlDataHandlerTest, List<string>>(null, "property", $"{stringList[0]},{stringList[1]},{stringList[2]}", It.IsAny<CancellationToken>()), Times.Once);
         }
 
         [Test]
@@ -246,23 +182,22 @@ namespace Test.GBase.DataHandling
         {
             Mock<IXmlDataReader> xmlDataReaderMock = new Mock<IXmlDataReader>();
             Mock<IXmlDataReaderFactory> xmlDataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            xmlDataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>())).Returns(xmlDataReaderMock.Object);
+            xmlDataReaderFactoryMock.Setup(r => r.Create()).Returns(xmlDataReaderMock.Object);
 
             Mock<IXmlDataWriter> xmlDataWriterMock = new Mock<IXmlDataWriter>();
             Mock<IXmlDataWriterFactory> xmlDataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            xmlDataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>())).Returns(xmlDataWriterMock.Object);
+            xmlDataWriterFactoryMock.Setup(w => w.Create()).Returns(xmlDataWriterMock.Object);
 
             Mock<IXmlDataHandlerCache> xmlDataHandlerCacheMock = new Mock<IXmlDataHandlerCache>();
             Mock<IXmlDataHandlerCacheFactory> xmlDataHandlerCacheFactoryMock = new Mock<IXmlDataHandlerCacheFactory>();
             xmlDataHandlerCacheFactoryMock.Setup(c => c.Create(It.IsAny<IXmlDataReader>())).Returns(xmlDataHandlerCacheMock.Object);
 
-            XmlDataHandler xmlDataHandler = new XmlDataHandler("path", "root", xmlDataReaderFactoryMock.Object,
-                xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
+            XmlDataHandler xmlDataHandler = new XmlDataHandler(xmlDataReaderFactoryMock.Object, xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
 
-            await xmlDataHandler.RemoveValue<XmlDataHandlerTest, string>("property", null);
+            await xmlDataHandler.RemoveValue<XmlDataHandlerTest, string>(null, "property", null, new CancellationToken());
 
             xmlDataHandlerCacheMock.Verify(c => c.TryRemoveValue<It.IsValueType, It.IsValueType>(It.IsAny<string>(), It.IsAny<It.IsValueType>()), Times.Never);
-            xmlDataWriterMock.Verify(w => w.Remove<It.IsValueType, It.IsValueType>(It.IsAny<string>(), It.IsAny<string>()), Times.Never);
+            xmlDataWriterMock.Verify(w => w.Remove<It.IsValueType, It.IsValueType>(null, It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()), Times.Never);
         }
 
         [Test]
@@ -274,18 +209,17 @@ namespace Test.GBase.DataHandling
             //xmlDataReaderMock.Setup(r => r.Read<XmlDataHandlerTest, string>("property")).ReturnsAsync<List<string>>(values);
 
             Mock<IXmlDataReaderFactory> xmlDataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            xmlDataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>())).Returns(xmlDataReaderMock.Object);
+            xmlDataReaderFactoryMock.Setup(r => r.Create()).Returns(xmlDataReaderMock.Object);
 
             Mock<IXmlDataWriter> xmlDataWriterMock = new Mock<IXmlDataWriter>();
             Mock<IXmlDataWriterFactory> xmlDataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            xmlDataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>())).Returns(xmlDataWriterMock.Object);
+            xmlDataWriterFactoryMock.Setup(w => w.Create()).Returns(xmlDataWriterMock.Object);
 
             Mock<IXmlDataHandlerCache> xmlDataHandlerCacheMock = new Mock<IXmlDataHandlerCache>();
             Mock<IXmlDataHandlerCacheFactory> xmlDataHandlerCacheFactoryMock = new Mock<IXmlDataHandlerCacheFactory>();
             xmlDataHandlerCacheFactoryMock.Setup(c => c.Create(It.IsAny<IXmlDataReader>())).Returns(xmlDataHandlerCacheMock.Object);
 
-            XmlDataHandler xmlDataHandler = new XmlDataHandler("path", "root", xmlDataReaderFactoryMock.Object,
-                xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
+            XmlDataHandler xmlDataHandler = new XmlDataHandler(xmlDataReaderFactoryMock.Object, xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
         }
 
         [Test]
@@ -297,20 +231,19 @@ namespace Test.GBase.DataHandling
             //xmlDataReaderMock.Setup(r => r.Read<XmlDataHandlerTest, string>("property")).ReturnsAsync<List<string>>(values);
 
             Mock<IXmlDataReaderFactory> xmlDataReaderFactoryMock = new Mock<IXmlDataReaderFactory>();
-            xmlDataReaderFactoryMock.Setup(r => r.Create(It.IsAny<string>())).Returns(xmlDataReaderMock.Object);
+            xmlDataReaderFactoryMock.Setup(r => r.Create()).Returns(xmlDataReaderMock.Object);
 
             Mock<IXmlDataWriter> xmlDataWriterMock = new Mock<IXmlDataWriter>();
             Mock<IXmlDataWriterFactory> xmlDataWriterFactoryMock = new Mock<IXmlDataWriterFactory>();
-            xmlDataWriterFactoryMock.Setup(w => w.Create(It.IsAny<string>(), It.IsAny<string>())).Returns(xmlDataWriterMock.Object);
+            xmlDataWriterFactoryMock.Setup(w => w.Create()).Returns(xmlDataWriterMock.Object);
 
             Mock<IXmlDataHandlerCache> xmlDataHandlerCacheMock = new Mock<IXmlDataHandlerCache>();
             Mock<IXmlDataHandlerCacheFactory> xmlDataHandlerCacheFactoryMock = new Mock<IXmlDataHandlerCacheFactory>();
             xmlDataHandlerCacheFactoryMock.Setup(c => c.Create(It.IsAny<IXmlDataReader>())).Returns(xmlDataHandlerCacheMock.Object);
 
-            XmlDataHandler xmlDataHandler = new XmlDataHandler("path", "root", xmlDataReaderFactoryMock.Object,
-                xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
+            XmlDataHandler xmlDataHandler = new XmlDataHandler(xmlDataReaderFactoryMock.Object, xmlDataWriterFactoryMock.Object, xmlDataHandlerCacheFactoryMock.Object);
 
-            IEnumerable<List<string>> readValues = await xmlDataHandler.GetValues<XmlDataHandlerTest, List<string>>("property");
+            IEnumerable<List<string>> readValues = await xmlDataHandler.GetValues<XmlDataHandlerTest, List<string>>(null, "property", new CancellationToken());
         }
     }
 }

Test.GBase/GBaseIntegrationTest/GBaseIntegrationTest.cs

@@ -0,0 +1,56 @@
+// Author: Gockner, Simon
+// Created: 2020-11-11
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System.Threading;
+using System.Threading.Tasks;
+using GBase.Factories;
+using GBase.Installers;
+using LightweightIocContainer;
+using LightweightIocContainer.Interfaces;
+using NUnit.Framework;
+
+namespace Test.GBase.GBaseIntegrationTest
+{
+    [TestFixture]
+    public class GBaseIntegrationTest
+    {
+        private CancellationTokenSource _cancellationTokenSource;
+        private IIocContainer _iocContainer;
+        
+        [SetUp]
+        public void SetUp()
+        {
+            _cancellationTokenSource = new CancellationTokenSource();
+            
+            _iocContainer = new IocContainer();
+            _iocContainer.Install(new GBaseInstaller(),
+                new DataHandlingInstaller(),
+                new FileHandlingInstaller());
+        }
+
+        [TearDown]
+        public void TearDown()
+        {
+            _cancellationTokenSource.Dispose();
+            _iocContainer.Dispose();
+        }
+
+        [Test]
+        public async Task TestGBase()
+        {
+            IGBaseFactory gBaseFactory = _iocContainer.Resolve<IGBaseFactory>();
+            Model model = new Model(gBaseFactory);
+
+            await model.Initialize(_cancellationTokenSource.Token);
+
+            await model.AddItem(new Item("Item 1", 1), _cancellationTokenSource.Token);
+            await model.AddItem(new Item("Item 2", 2), _cancellationTokenSource.Token);
+            await model.AddItem(new Item("Item 3", 3), _cancellationTokenSource.Token);
+
+            await model.AddGroup(new Group(1) {Items = { model.Items[0], model.Items[1] }}, _cancellationTokenSource.Token);
+            await model.AddGroup(new Group(2) {Items = { model.Items[1], model.Items[2] }}, _cancellationTokenSource.Token);
+            await model.AddGroup(new Group(3) {Items = { model.Items[0], model.Items[2] }}, _cancellationTokenSource.Token);
+        }
+    }
+}

Test.GBase/GBaseIntegrationTest/Group.cs

@@ -0,0 +1,41 @@
+// Author: Gockner, Simon
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System.Collections.Generic;
+using GBase;
+using GBase.Attributes;
+
+namespace Test.GBase.GBaseIntegrationTest
+{
+    [GBaseTable("Groups")]
+    public class Group : IGroup
+    {
+        public Group()
+        {
+            Items = new List<Item>();
+        }
+        
+        public Group(int number)
+        {
+            Number = number;
+            Items = new List<Item>();
+        }
+
+        [GBaseColumn]
+        public int Number { get; private set; }
+        
+        [GBaseColumn]
+        public List<Item> Items { get; }
+        
+        public GBaseKey Key { get; set; }
+        public string FileName => $"Group{Number}";
+
+        public override string ToString() => $"{Number}";
+        public void Initialize(GBaseKey key, List<object> parameters)
+        {
+            Key = key;
+            Number = (int) parameters[0];
+        }
+    }
+}

Test.GBase/GBaseIntegrationTest/IGroup.cs

@@ -0,0 +1,16 @@
+// Author: Gockner, Simon
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System.Collections.Generic;
+using GBase.Api;
+using GBase.Interfaces;
+
+namespace Test.GBase.GBaseIntegrationTest
+{
+    public interface IGroup : IGBaseObject //: INotifyGBaseEntryChanged
+    {
+        int Number { get; }
+        List<Item> Items { get; }
+    }
+}

Test.GBase/GBaseIntegrationTest/IItem.cs

@@ -0,0 +1,14 @@
+// Author: Gockner, Simon
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using GBase.Interfaces;
+
+namespace Test.GBase.GBaseIntegrationTest
+{
+    public interface IItem : IGBaseObject //: INotifyGBaseEntryChanged
+    {
+        string Name { get; }
+        int Number { get; }
+    }
+}

Test.GBase/GBaseIntegrationTest/Item.cs

@@ -0,0 +1,43 @@
+// Author: Gockner, Simon
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System.Collections.Generic;
+using GBase;
+using GBase.Attributes;
+
+namespace Test.GBase.GBaseIntegrationTest
+{
+    [GBaseTable("Items")]
+    public class Item : IItem
+    {
+        public Item()
+        {
+            
+        }
+        
+        public Item(string name, int number)
+        {
+            Name = name;
+            Number = number;
+        }
+
+        [GBaseColumn]
+        public string Name { get; private set; }
+        
+        [GBaseColumn]
+        public int Number { get; private set; }
+
+        public GBaseKey Key { get; set; }
+        public string FileName => Name;
+
+        public override string ToString() => $"{Number}/{Name}";
+
+        public void Initialize(GBaseKey key, List<object> parameters)
+        {
+            Key = key;
+            Name = (string) parameters[0];
+            Number = (int) parameters[1];
+        }
+    }
+}

Test.GBase/GBaseIntegrationTest/Model.cs

@@ -0,0 +1,54 @@
+// Author: Gockner, Simon
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Threading;
+using System.Threading.Tasks;
+using GBase.Factories;
+using GBase.Interfaces;
+
+namespace Test.GBase.GBaseIntegrationTest
+{
+    public class Model
+    {
+        private readonly IGBase _gBase;
+
+        public Model(IGBaseFactory gBaseFactory)
+        {
+            _gBase = gBaseFactory.Create(new Settings());
+            Items = new List<Item>();
+            Groups = new List<Group>();
+        }
+        
+        public List<Item> Items { get; private set; }
+        public List<Group> Groups { get; private set; }
+
+        public async Task Initialize(CancellationToken cancellationToken)
+        {
+            await _gBase.Init("DB", Assembly.GetExecutingAssembly(), cancellationToken);
+
+            IGBaseTable<Item> itemsTable = _gBase.GetTable<Item>();
+            Items = itemsTable.Entries.ToList();
+            //Items = (await _gBase.GetValues<Model, Item>(this, nameof(Items), cancellationToken)).Cast<IItem>().ToList();
+            
+            IGBaseTable<Group> groupsTable = _gBase.GetTable<Group>();
+            Groups = groupsTable.Entries.ToList();
+            //Groups = (await _gBase.GetValues<Model, Group>(this, nameof(Groups), cancellationToken)).Cast<IGroup>().ToList();
+        }
+
+        public async Task AddItem(Item item, CancellationToken cancellationToken)
+        {
+            Items.Add(item);
+            await _gBase.AddEntry(item, cancellationToken);
+        }
+
+        public async Task AddGroup(Group group, CancellationToken cancellationToken)
+        {
+            Groups.Add(group);
+            await _gBase.AddEntry(group, cancellationToken);
+        }
+    }
+}

Test.GBase/GBaseIntegrationTest/Settings.cs

@@ -0,0 +1,15 @@
+// Author: Gockner, Simon
+// Created: 2020-09-18
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+using System.IO;
+using GBase.Interfaces.Settings;
+
+namespace Test.GBase.GBaseIntegrationTest
+{
+    public class Settings : IGBaseSettings
+    {
+        public string DatabasePath => Path.Combine(Environment.CurrentDirectory, "DB");
+    }
+}

Test.GBase/GBaseTableIntegrationTest.cs

@@ -2,11 +2,13 @@
 // Created: 2020-03-09
 // Copyright(c) 2020 SimonG. All Rights Reserved.
 
+using System;
 using System.Threading;
 using GBase;
 using GBase.Factories;
 using GBase.FileHandling.Factories;
 using GBase.Interfaces;
+using GBase.Interfaces.DataHandling.Pool;
 using GBase.Interfaces.FileHandling;
 using Moq;
 using NUnit.Framework;
@@ -23,17 +25,24 @@ namespace Test.GBase
             Mock<IFileHandlerFactory> fileHandlerFactoryMock = new Mock<IFileHandlerFactory>();
             fileHandlerFactoryMock.Setup(f => f.Create()).Returns(new Mock<IFileHandler>().Object);
 
+            IGBaseColumn gBaseColumn = null;
             Mock<IGBaseColumnFactory> gBaseColumnFactoryMock = new Mock<IGBaseColumnFactory>();
-            gBaseColumnFactoryMock.Setup(c => c.Create()).Returns(new GBaseColumn());
+            gBaseColumnFactoryMock.Setup(c => c.Create(It.IsAny<string>(), It.IsAny<Type>(), It.IsAny<bool>()))
+                .Callback<string, Type, bool>((name, type, isKey) => { gBaseColumn = new GBaseColumn(name, type, isKey); })
+                .Returns(gBaseColumn);
 
-            IGBaseTable table = new GBaseTable(fileHandlerFactoryMock.Object, gBaseColumnFactoryMock.Object);
-            table.Init(typeof(Foo), nameof(Foo), "", CancellationToken.None);
+            Mock<IDataHandlerPool> dataHandlerPoolMock = new Mock<IDataHandlerPool>();
+            
+            IGBaseTable<Foo> table = new GBaseTable<Foo>(fileHandlerFactoryMock.Object, dataHandlerPoolMock.Object, gBaseColumnFactoryMock.Object);
+            table.Init(typeof(Foo), "", "", CancellationToken.None);
+
+            CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
             
             Foo foo = new Foo("Test");
-            table.AddEntry(foo);
+            table.AddEntry(foo, cancellationTokenSource.Token);
 
             Foo foo2 = new Foo("Test2");
-            table.AddEntry(foo2);
+            table.AddEntry(foo2, cancellationTokenSource.Token);
 
             foo.Name = "Foo - ex Test";
             foo2.Name = "Some Name";

Test.GBase/Helpers/EnumerablesTest.cs

@@ -5,6 +5,8 @@
 using System.Collections.Generic;
 using GBase.Exceptions;
 using GBase.Helpers;
+using GBase.Interfaces;
+using Moq;
 using NUnit.Framework;
 using Test.GBase.TestClasses;
 
@@ -85,7 +87,7 @@ namespace Test.GBase.Helpers
 
             string @string = $"{list[0]},{list[1]},{list[2]}";
 
-            Assert.AreEqual(list, Enumerables.ConvertToGBaseEnumerable<List<string>>(@string));
+            Assert.AreEqual(list, Enumerables.ConvertToGBaseEnumerable<List<string>>(@string, Mock.Of<IGBase>()));
         }
 
         [Test]
@@ -100,7 +102,7 @@ namespace Test.GBase.Helpers
 
             string @string = $"{list[0]},{list[1]},{list[2]}";
 
-            Assert.AreEqual(list, Enumerables.ConvertToGBaseEnumerable<List<int>>(@string));
+            Assert.AreEqual(list, Enumerables.ConvertToGBaseEnumerable<List<int>>(@string, Mock.Of<IGBase>()));
         }
 
         [Test]
@@ -115,7 +117,7 @@ namespace Test.GBase.Helpers
 
             string @string = $"{list[0]},{list[1]},{list[2]}";
 
-            Assert.AreEqual(list, Enumerables.ConvertToGBaseEnumerable<List<UserType>>(@string));
+            Assert.AreEqual(list, Enumerables.ConvertToGBaseEnumerable<List<UserType>>(@string, Mock.Of<IGBase>()));
         }
 
         [Test]
@@ -130,7 +132,7 @@ namespace Test.GBase.Helpers
 
             string @string = $"{list[0]},{list[1]},{list[2]}";
 
-            InterfaceEnumerablePassedException exception = Assert.Throws<InterfaceEnumerablePassedException>(() => Enumerables.ConvertToGBaseEnumerable<List<IUserType>>(@string));
+            InterfaceEnumerablePassedException exception = Assert.Throws<InterfaceEnumerablePassedException>(() => Enumerables.ConvertToGBaseEnumerable<List<IUserType>>(@string, Mock.Of<IGBase>()));
             Assert.AreEqual(typeof(IUserType), exception.InterfaceType);
         }
     }

Test.GBase/TestClasses/Foo.cs

@@ -2,16 +2,25 @@
 // Created: 2020-01-27
 // Copyright(c) 2020 SimonG. All Rights Reserved.
 
+using System;
+using System.Collections.Generic;
+using GBase;
 using GBase.Api;
 using GBase.Attributes;
+using GBase.Interfaces;
 
 namespace Test.GBase.TestClasses
 {
-    [GBaseTable]
-    public class Foo : NotifyGBaseEntryChanged
+    [GBaseTable("Foo")]
+    public class Foo : NotifyGBaseEntryChanged, IGBaseObject
     {
         private string _name;
 
+        public Foo()
+        {
+            
+        }
+        
         public Foo(string name)
         {
             Name = name;
@@ -27,5 +36,13 @@ namespace Test.GBase.TestClasses
                 RaiseGBaseEntryChanged(this, nameof(Name), _name);
             }
         }
+
+        public GBaseKey Key { get; set; }
+        public string FileName => Name;
+
+        public void Initialize(GBaseKey key, List<object> parameters)
+        {
+            throw new NotImplementedException();
+        }
     }
 }

Test.GBase/TestClasses/IUserType.cs

@@ -3,6 +3,7 @@
 // Copyright(c) 2020 SimonG. All Rights Reserved.
 
 using GBase.Api;
+using GBase.Interfaces;
 
 namespace Test.GBase.TestClasses
 {

Test.GBase/TestClasses/UserType.cs

@@ -3,7 +3,9 @@
 // Copyright(c) 2020 SimonG. All Rights Reserved.
 
 using System;
+using System.Collections.Generic;
 using System.Linq;
+using GBase;
 
 namespace Test.GBase.TestClasses
 {
@@ -21,10 +23,12 @@ namespace Test.GBase.TestClasses
 
         private int Number { get; set; }
 
-        public void InitializeFromString(string @string)
+        public GBaseKey Key { get; set; }
+        public string FileName { get; }
+
+        public void Initialize(GBaseKey key, List<object> parameters)
         {
-            string numberString = @string.Split('_').Last();
-            Number = Convert.ToInt32(numberString);
+            throw new NotImplementedException();
         }
 
         public override string ToString() => $"{nameof(UserType)}_{nameof(Number)}_{Number}";