Implement worker AddItem commands

src/MxGateway.Worker/MxAccess/MxAccessHandleRegistry.cs

@@ -6,12 +6,19 @@ namespace MxGateway.Worker.MxAccess;
 public sealed class MxAccessHandleRegistry
 {
     private readonly Dictionary<int, RegisteredServerHandle> serverHandles = new();
+    private readonly Dictionary<long, RegisteredItemHandle> itemHandles = new();
 
     public IReadOnlyList<RegisteredServerHandle> ServerHandles => serverHandles
         .Values
         .OrderBy(handle => handle.ServerHandle)
         .ToArray();
 
+    public IReadOnlyList<RegisteredItemHandle> ItemHandles => itemHandles
+        .Values
+        .OrderBy(handle => handle.ServerHandle)
+        .ThenBy(handle => handle.ItemHandle)
+        .ToArray();
+
     public void RegisterServerHandle(
         int serverHandle,
         string clientName)
@@ -22,10 +29,54 @@ public sealed class MxAccessHandleRegistry
     public void UnregisterServerHandle(int serverHandle)
     {
         serverHandles.Remove(serverHandle);
+
+        foreach (long key in itemHandles
+            .Where(pair => pair.Value.ServerHandle == serverHandle)
+            .Select(pair => pair.Key)
+            .ToArray())
+        {
+            itemHandles.Remove(key);
+        }
     }
 
     public bool ContainsServerHandle(int serverHandle)
     {
         return serverHandles.ContainsKey(serverHandle);
     }
+
+    public void RegisterItemHandle(
+        int serverHandle,
+        int itemHandle,
+        string itemDefinition,
+        string itemContext,
+        bool hasItemContext)
+    {
+        itemHandles[CreateItemKey(serverHandle, itemHandle)] = new RegisteredItemHandle(
+            serverHandle,
+            itemHandle,
+            itemDefinition,
+            itemContext,
+            hasItemContext);
+    }
+
+    public void RemoveItemHandle(
+        int serverHandle,
+        int itemHandle)
+    {
+        itemHandles.Remove(CreateItemKey(serverHandle, itemHandle));
+    }
+
+    public bool ContainsItemHandle(
+        int serverHandle,
+        int itemHandle)
+    {
+        return itemHandles.ContainsKey(CreateItemKey(serverHandle, itemHandle));
+    }
+
+    private static long CreateItemKey(
+        int serverHandle,
+        int itemHandle)
+    {
+        return ((long)serverHandle << 32) | (uint)itemHandle;
+    }
 }