begin developing a basic message based web api

Pilz.Networking/Api/ApiServer.cs

@@ -0,0 +1,49 @@
+using System.Reflection;
+
+namespace Pilz.Networking.Api;
+
+public class ApiServer : ApiClient, IApiServer
+{
+    protected readonly Dictionary<string, object> handlers = [];
+    protected readonly Dictionary<Type, IMessageSerializer> serializers = [];
+
+    public IMessageSerializer Serializer { get; set; } = new DefaultMessageSerializer();
+
+    public virtual void RegisterHandler<T>(string url, T instance) where T : class
+    {
+        var methods = typeof(T).GetMethods(BindingFlags.Instance | BindingFlags.Public);
+
+        foreach (var method in methods)
+        {
+            if (method.GetCustomAttribute<MessageHandlerAttribute>() is not MessageHandlerAttribute attribute
+                || method.GetParameters().FirstOrDefault() is not ParameterInfo parameterInfo
+                || !parameterInfo.ParameterType.IsAssignableTo(typeof(ApiMessage)))
+                continue;
+
+
+            var serializer = Serializer;
+            if (attribute.Serializer is not null)
+            {
+                if (serializers.TryGetValue(attribute.Serializer, out var s) && s is not null)
+                    serializer = s;
+                else if (Activator.CreateInstance(attribute.Serializer) is IMessageSerializer ss)
+                {
+                    serializer = ss;
+                    serializers.Add(attribute.Serializer, ss);
+                }
+            }
+
+            // ...
+        }
+    }
+
+    public virtual void RegisterHandler(string url, Delegate handler)
+    {
+        // ...
+    }
+
+    protected virtual string? HandleMessage(string url, string json)
+    {
+        // ...
+    }
+}