Implemented hot reload of configuration

When a config is changed and saved by an entity framework context:
* it will forward these changes to a IConfigurationChangeListener which is specific to the Persistence.EntityFramework.
* The implementation of that will
  * update the cached configuration objects and their parent objects, in case it's an collection
  * notify an instance of a ConfigurationChangeHandler which also existed before
  * The change handler will notify the change mediator (game logic), on which several logic objects will subscribe for changes

To make this work, especially updating the cached objects, I had to implement something like ICloneable<T> and Assignable<T>. I did this by implementing a code generator and a CloneableAttribute. The referencing of it might need some adaptions as it's probably only working in debug build right now.

src/Annotations/CloneableAttribute.cs

@@ -0,0 +1,14 @@
+// <copyright file="CloneableAttribute.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.Annotations;
+
+/// <summary>
+/// Classes marked with this attribute will get a generic Clonable-Interface
+/// implemented by a code generator.
+/// </summary>
+[AttributeUsage(AttributeTargets.Class, Inherited = false, AllowMultiple = false)]
+public sealed class CloneableAttribute : Attribute
+{
+}

src/Annotations/MUnique.OpenMU.Annotations.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <WarningsAsErrors>nullable;CS4014;VSTHRD110;VSTHRD100</WarningsAsErrors>
+    <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
+  </PropertyGroup>
+
+</Project>

src/DataModel/AssignableExtensions.cs

@@ -0,0 +1,51 @@
+// <copyright file="AssignableExtensions.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.DataModel;
+
+using MUnique.OpenMU.DataModel.Configuration;
+
+/// <summary>
+/// Extensions for <see cref="IAssignable{T}"/>.
+/// </summary>
+public static class AssignableExtensions
+{
+    /// <summary>
+    /// Assigns a collection to another one, resolving the objects to the ones
+    /// which are contained in the given <see cref="GameConfiguration"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the collection elements.</typeparam>
+    /// <param name="collection">The target collection.</param>
+    /// <param name="other">The other collection.</param>
+    /// <param name="gameConfiguration">The game configuration.</param>
+    public static void AssignCollection<T>(this ICollection<T> collection, ICollection<T> other, GameConfiguration gameConfiguration)
+        where T : class
+    {
+        var newItems = collection.Except(other).ToList();
+        var oldItems = other.Except(collection).ToList();
+
+        oldItems.ForEach(i => collection.Remove(i));
+        newItems.ForEach(i => collection.Add(
+            gameConfiguration.GetObjectOfConfig(i)
+            ?? (i as ICloneable<T>)?.Clone(gameConfiguration)
+            ?? (i as ICloneable)?.Clone() as T
+            ?? i));
+    }
+
+    /// <summary>
+    /// Assigns a collection to another one.
+    /// </summary>
+    /// <typeparam name="T">The type of the collection values.</typeparam>
+    /// <param name="collection">The target collection.</param>
+    /// <param name="other">The other collection.</param>
+    public static void AssignCollection<T>(this ICollection<T> collection, ICollection<T> other)
+        where T : struct
+    {
+        var newItems = collection.Except(other).ToList();
+        var oldItems = other.Except(collection).ToList();
+
+        oldItems.ForEach(i => collection.Remove(i));
+        newItems.ForEach(collection.Add);
+    }
+}

src/DataModel/Attributes/PowerUpDefinition.cs

@@ -5,12 +5,14 @@
 namespace MUnique.OpenMU.DataModel.Attributes;
 
 using System.Globalization;
+using MUnique.OpenMU.Annotations;
 using MUnique.OpenMU.AttributeSystem;
 
 /// <summary>
 /// The power up definition which describes the boost of an target attribute.
 /// </summary>
-public class PowerUpDefinition
+[Cloneable]
+public partial class PowerUpDefinition
 {
     /// <summary>
     /// Gets or sets the target attribute.

src/DataModel/Attributes/PowerUpDefinitionValue.cs

@@ -5,12 +5,14 @@
 namespace MUnique.OpenMU.DataModel.Attributes;
 
 using System.ComponentModel;
+using MUnique.OpenMU.Annotations;
 using MUnique.OpenMU.AttributeSystem;
 
 /// <summary>
 /// The power up definition value which can consist of a constant value and several related values which are all added together to get the result.
 /// </summary>
-public class PowerUpDefinitionValue
+[Cloneable]
+public partial class PowerUpDefinitionValue
 {
     /// <summary>
     /// Gets or sets the constant value part of the value.

src/DataModel/Configuration/BattleZoneDefinition.cs

@@ -4,10 +4,13 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
+
 /// <summary>
 /// Defines a battle zone.
 /// </summary>
-public class BattleZoneDefinition
+[Cloneable]
+public partial class BattleZoneDefinition
 {
     /// <summary>
     /// Gets or sets the battle type.

src/DataModel/Configuration/CharacterClass.cs

@@ -4,13 +4,15 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
 using MUnique.OpenMU.AttributeSystem;
 using MUnique.OpenMU.DataModel.Entities;
 
 /// <summary>
 /// Defines a character class.
 /// </summary>
-public class CharacterClass
+[Cloneable]
+public partial class CharacterClass
 {
     /// <summary>
     /// Gets or sets the id of a character class.

src/DataModel/Configuration/ChatServerDefinition.cs

@@ -4,11 +4,14 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
+
 /// <summary>
 /// Settings for the chat server.
 /// </summary>
 [AggregateRoot]
-public class ChatServerDefinition
+[Cloneable]
+public partial class ChatServerDefinition
 {
     /// <summary>
     /// Gets or sets the server identifier.

src/DataModel/Configuration/ConnectServerDefinition.cs

@@ -4,13 +4,15 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
 using MUnique.OpenMU.Interfaces;
 
 /// <summary>
 /// The definition of a connect server.
 /// </summary>
 [AggregateRoot]
-public class ConnectServerDefinition : IConnectServerSettings
+[Cloneable]
+public partial class ConnectServerDefinition : IConnectServerSettings
 {
     /// <summary>
     /// Gets or sets the id of this definition.

src/DataModel/Configuration/DropItemGroup.cs

@@ -4,6 +4,7 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
 using MUnique.OpenMU.DataModel.Configuration.Items;
 
 /// <summary>
@@ -47,7 +48,8 @@ public enum SpecialItemType
 /// In the drop generator sort all DropItemGroups by its chance.
 /// Classes which can have DropItemGroups: Maps, Monsters(for example the kundun drops), Players(for quest items).
 /// </summary>
-public class DropItemGroup
+[Cloneable]
+public partial class DropItemGroup
 {
     /// <summary>
     /// Gets or sets the description.

src/DataModel/Configuration/EnterGate.cs

@@ -4,10 +4,13 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
+
 /// <summary>
 /// Defines a gate which a player can enter to move to another <see cref="ExitGate"/>.
 /// </summary>
-public class EnterGate : Gate
+[Cloneable]
+public partial class EnterGate : Gate
 {
     /// <summary>
     /// Gets or sets the target gate.

src/DataModel/Configuration/ExitGate.cs

@@ -4,10 +4,13 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
+
 /// <summary>
 /// Defines a gate through which a player enters a map.
 /// </summary>
-public class ExitGate : Gate
+[Cloneable]
+public partial class ExitGate : Gate
 {
     /// <summary>
     /// Gets or sets the direction to which the player looks when he enters the map.

src/DataModel/Configuration/GameClientDefinition.cs

@@ -4,14 +4,16 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
 using MUnique.OpenMU.Interfaces;
 using MUnique.OpenMU.Network.PlugIns;
 
 /// <summary>
 /// Defines a game client.
 /// </summary>
 [AggregateRoot]
-public class GameClientDefinition : IGameClientVersion
+[Cloneable]
+public partial class GameClientDefinition : IGameClientVersion
 {
     /// <summary>
     /// Gets or sets the season.

src/DataModel/Configuration/GameConfiguration.cs

@@ -4,6 +4,7 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
 using MUnique.OpenMU.AttributeSystem;
 using MUnique.OpenMU.DataModel.Configuration.Items;
 using MUnique.OpenMU.DataModel.Entities;
@@ -14,7 +15,8 @@ namespace MUnique.OpenMU.DataModel.Configuration;
 /// A game configuration contains the whole configuration of a game, directly or indirectly.
 /// </summary>
 [AggregateRoot]
-public class GameConfiguration
+[Cloneable]
+public partial class GameConfiguration
 {
     /// <summary>
     /// Gets or sets the maximum reachable level.

src/DataModel/Configuration/GameMapDefinition.cs

@@ -4,6 +4,7 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
 using MUnique.OpenMU.DataModel.Attributes;
 using MUnique.OpenMU.DataModel.Configuration.Items;
 
@@ -19,7 +20,8 @@ namespace MUnique.OpenMU.DataModel.Configuration;
 /// To reflect this requirement on this data model, for each status there must be one game map definition.
 /// The switch between this status and its corresponding game map definitions should be done in game logic.
 /// </remarks>
-public class GameMapDefinition
+[Cloneable]
+public partial class GameMapDefinition
 {
     /// <summary>
     /// Gets or sets the number of the map.

src/DataModel/Configuration/GameServerConfiguration.cs

@@ -4,11 +4,14 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
+
 /// <summary>
 /// Defines the game server configuration.
 /// </summary>
 [AggregateRoot]
-public class GameServerConfiguration
+[Cloneable]
+public partial class GameServerConfiguration
 {
     /// <summary>
     /// Gets or sets the maximum number of players which can connect.

src/DataModel/Configuration/GameServerDefinition.cs

@@ -5,12 +5,14 @@
 namespace MUnique.OpenMU.DataModel.Configuration;
 
 using System.Globalization;
+using MUnique.OpenMU.Annotations;
 
 /// <summary>
 /// Defines the configuration of a game server.
 /// </summary>
 [AggregateRoot]
-public class GameServerDefinition
+[Cloneable]
+public partial class GameServerDefinition
 {
     /// <summary>
     /// Gets or sets the server identifier.

src/DataModel/Configuration/GameServerEndpoint.cs

@@ -4,10 +4,13 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
+
 /// <summary>
 /// Defines an endpoint of a game server.
 /// </summary>
-public class GameServerEndpoint : ServerEndpoint
+[Cloneable]
+public partial class GameServerEndpoint : ServerEndpoint
 {
     /// <summary>
     /// Gets or sets the alternative published network port. It's reported to the connect server instead of the <see cref="ServerEndpoint.NetworkPort"/>, if not <c>0</c>.

src/DataModel/Configuration/Gate.cs

@@ -4,10 +4,13 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration;
 
+using MUnique.OpenMU.Annotations;
+
 /// <summary>
 /// Defines a gate through which a player can exit or enter to other maps.
 /// </summary>
-public class Gate
+[Cloneable]
+public partial class Gate
 {
     /// <summary>
     /// Gets or sets the upper left corner, x-coordinate.

src/DataModel/Configuration/ItemCrafting/ItemCrafting.cs

@@ -4,10 +4,13 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration.ItemCrafting;
 
+using MUnique.OpenMU.Annotations;
+
 /// <summary>
 /// Description of IItemCrafting.
 /// </summary>
-public class ItemCrafting
+[Cloneable]
+public partial class ItemCrafting
 {
     /// <summary>
     /// Gets or sets the number.

src/DataModel/Configuration/ItemCrafting/ItemCraftingRequiredItem.cs

@@ -5,12 +5,14 @@
 namespace MUnique.OpenMU.DataModel.Configuration.ItemCrafting;
 
 using System.Globalization;
+using MUnique.OpenMU.Annotations;
 using MUnique.OpenMU.DataModel.Configuration.Items;
 
 /// <summary>
 /// Describes an required item for a crafting.
 /// </summary>
-public class ItemCraftingRequiredItem
+[Cloneable]
+public partial class ItemCraftingRequiredItem
 {
     /// <summary>
     /// Gets or sets the collection of possible items which are valid for this requirement.

src/DataModel/Configuration/ItemCrafting/ItemCraftingResultItem.cs

@@ -4,12 +4,14 @@
 
 namespace MUnique.OpenMU.DataModel.Configuration.ItemCrafting;
 
+using MUnique.OpenMU.Annotations;
 using MUnique.OpenMU.DataModel.Configuration.Items;
 
 /// <summary>
 /// Defines the resulting item of a crafting.
 /// </summary>
-public class ItemCraftingResultItem
+[Cloneable]
+public partial class ItemCraftingResultItem
 {
     /// <summary>
     /// Gets or sets the item definition.