add SyncedConfig2 and SyncedEntryFieldAttribute

Author: Lordfirespeed

CSync/Lib/SyncedConfig2.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Linq;
+using System.Reflection;
+using System.Threading;
+using CSync.Extensions;
+using HarmonyLib;
+using JetBrains.Annotations;
+
+namespace CSync.Lib;
+
+/// <summary>
+/// Wrapper class allowing the config class (type parameter) to be synchronized.<br></br>
+/// Stores the mod's unique identifier and handles registering and sending of named messages.
+/// </summary>
+[PublicAPI]
+public class SyncedConfig2<T> : ISyncedConfig where T : SyncedConfig2<T>
+{
+    public ISyncedEntryContainer EntryContainer { get; } = new SyncedEntryContainer();
+    private int _entryContainerPopulated = 0;
+
+    public SyncedConfig2(string guid)
+    {
+        GUID = guid;
+    }
+
+    /// <summary>
+    /// The mod name or abbreviation. After being given to the constructor, it cannot be changed.
+    /// </summary>
+    public string GUID { get; }
+
+    private static Lazy<FieldInfo[]> SyncedEntryFields = new(
+        () => AccessTools.GetDeclaredFields(typeof(T))
+            .Where(field => field.GetCustomAttribute<SyncedEntryFieldAttribute>() is not null)
+            .Where(field => typeof(SyncedEntryBase).IsAssignableFrom(field.FieldType))
+            .ToArray()
+    );
+
+    internal void PopulateEntryContainer()
+    {
+        if (Interlocked.Exchange(ref _entryContainerPopulated, 1) != 0) return;
+        foreach (var fieldInfo in SyncedEntryFields.Value)
+        {
+            var entryBase = (SyncedEntryBase)fieldInfo.GetValue(this);
+            EntryContainer.Add(entryBase.BoxedEntry.ToSyncedEntryIdentifier(), entryBase);
+        }
+    }
+
+    public event EventHandler? InitialSyncCompleted;
+    internal void OnInitialSyncCompleted(object sender, EventArgs e) => InitialSyncCompleted?.Invoke(sender, e);
+}

CSync/Lib/SyncedEntryFieldAttribute.cs

@@ -0,0 +1,6 @@
+using System;
+
+namespace CSync.Lib;
+
+[AttributeUsage(AttributeTargets.Field)]
+public class SyncedEntryFieldAttribute : Attribute;