Added Event Pipeline System

Firebird2D.EventPipelines/Pipeline.cs

@@ -0,0 +1,44 @@
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Mail;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Firebird2D.EventPipelines
+{
+    public class Pipeline <T> : I_Pipeline where T : EventArgs
+    {
+        public object PipelineMaster { get; }
+
+        private event EventHandler<T>? OnEvent;
+
+        public Pipeline(object pipelineMaster)
+        {
+            PipelineMaster = pipelineMaster;
+        }
+
+        public bool IsEventEmpty { get {  return OnEvent != null; } }
+
+        public void Subscribe(Delegate handler)
+        {
+            OnEvent += (EventHandler<T>)handler;
+        }
+
+        public void Unsubscribe(Delegate handler)
+        {
+            OnEvent -= (EventHandler<T>)handler;
+        }
+
+        public void SendEvent(object sender, T args)
+        {
+            if (sender == null || args == null) throw new ArgumentNullException(nameof(sender));
+            if (args is not T) throw new ArgumentException($"Invalid EventArgs type. Expected {typeof(T)}");
+            if (sender.Equals(PipelineMaster)) throw new InvalidDataException("Only the pipeline master is allowed to send events through this pipeline.");
+
+            OnEvent?.Invoke(sender, args);
+
+        }
+    }
+}