first commit

NitroxModel/Packets/Processors/Abstract/PacketProcessor.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+
+namespace NitroxModel.Packets.Processors.Abstract
+{
+    public abstract class PacketProcessor
+    {
+        public abstract void ProcessPacket(Packet packet, IProcessorContext context);
+
+        public static Dictionary<Type, PacketProcessor> GetProcessors(Dictionary<Type, object> processorArguments, Func<Type, bool> additionalConstraints)
+        {
+            return Assembly.GetCallingAssembly()
+                .GetTypes()
+                .Where(p => typeof(PacketProcessor).IsAssignableFrom(p) && p.IsClass && !p.IsAbstract)
+                .Where(additionalConstraints)
+                .ToDictionary(proc => proc.BaseType.GetGenericArguments()[0], proc =>
+                {
+                    ConstructorInfo[] ctors = proc.GetConstructors();
+                    if (ctors.Length > 1)
+                    {
+                        throw new NotSupportedException($"{proc.Name} has more than one constructor!");
+                    }
+
+                    ConstructorInfo ctor = ctors.First();
+
+                    // Prepare arguments for constructor (if applicable):
+                    object[] args = ctor.GetParameters().Select(pi =>
+                        {
+                            if (processorArguments.TryGetValue(pi.ParameterType, out object v))
+                            {
+                                return v;
+                            }
+
+                            throw new ArgumentException($"Argument value not defined for type {pi.ParameterType}! Used in {proc}");
+                        }).ToArray();
+
+                    return (PacketProcessor)ctor.Invoke(args);
+                });
+        }
+    }
+}