add better initialization

Pilz.Net/Api/ApiServer.cs

@@ -17,6 +17,7 @@ public class ApiServer : IApiServer
     public class MissingDataManagerException : Exception { }
 
     protected readonly List<PrivateMessageHandler> handlers = [];
+    protected readonly List<object> handlerObjects = [];
     protected readonly Dictionary<Type, IApiMessageSerializer> serializers = [];
     protected readonly Dictionary<ThreadHolder, IDataManager> managers = [];
     protected HttpListener httpListener;
@@ -25,6 +26,7 @@ public class ApiServer : IApiServer
     protected SemaphoreSlim? semaphore;
     protected bool doListen;
     protected bool isAutoRestarting;
+    protected bool initializedHandlers;
 
     public event OnCheckAuthenticationEventHandler? OnCheckAuthentication;
     public event OnCheckContextEventHandler? OnCheckContext;
@@ -109,6 +111,7 @@ public class ApiServer : IApiServer
     public virtual void Start()
     {
         Log.Info("Starting listener");
+        InitializeHandlers();
         httpListener.Prefixes.Add(ApiUrl + "/");
         doListen = true;
         httpListener.Start();
@@ -183,6 +186,20 @@ public class ApiServer : IApiServer
             semaphore.Release();
     }
 
+    protected virtual void InitializeHandlers()
+    {
+        foreach (var instance in handlerObjects)
+        {
+            if (instance is IApiHandlerInitializer initializer)
+                initializer.Initialize();
+        }
+    }
+
+    public virtual T? GetHandler<T>()
+    {
+        return handlerObjects.OfType<T>().FirstOrDefault();
+    }
+
     public virtual Dictionary<string, string[]> GetEndpoints()
     {
         return handlers.OrderBy(n => n.Attribute.Route).GroupBy(n => n.Attribute.Route).ToDictionary(n => n.Key, n => n.SelectMany(n => n.Attribute.Methods.OrderBy(n => n)).ToArray());
@@ -190,9 +207,8 @@ public class ApiServer : IApiServer
 
     public virtual void RegisterHandler<T>(T instance) where T : class
     {
-        // Initialize
-        if (instance is IApiHandlerInitializer initializer)
-            initializer.Initialize(this);
+        if (!handlerObjects.Contains(instance))
+            handlerObjects.Add(instance);
 
         // Get all public instance methods
         var methods = instance.GetType().GetMethods(BindingFlags.Instance | BindingFlags.Public);