Add project files.

Esiur/Engine/AsyncReply.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Esiur.Engine
+{
+    public class AsyncReply
+    {
+        protected List<Action<object>> callbacks = new List<Action<object>>();
+        protected object result;
+        object callbacksLock = new object();
+
+        //bool fired = false;
+        protected bool resultReady = false;
+
+        public bool Ready
+        {
+            get { return resultReady; }
+        }
+
+        public object Result
+        {
+            get { return result; }
+        }
+
+        public void Then(Action<object> callback)
+        {
+            callbacks.Add(callback);
+
+            if (resultReady)
+                callback(result);
+            //    Trigger(this.result);
+        }
+
+        public void Trigger(object result)
+        {
+            //if (!fired)
+            //{
+            this.result = result;
+            resultReady = true;
+
+            lock (callbacksLock)
+            {
+                foreach (var cb in callbacks)
+                    cb(result);
+                //callbacks.Clear();
+            }
+            /*
+                if (callback == null)
+                {
+                    fireAtChance = true;
+                }
+                else
+                {
+                    callback(result);
+                    fired = true;
+                }
+                */
+            //}
+        }
+
+        public AsyncReply()
+        {
+
+        }
+
+        public AsyncReply(object result)
+        {
+            resultReady = true;
+            this.result = result;
+        }
+    }
+}