--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Implab/IPromise.cs	Fri Nov 01 16:03:08 2013 +0400
@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Implab
+{
+    public interface IPromise
+    {
+        /// <summary>
+        /// Check whereather the promise has no more than one dependent promise.
+        /// </summary>
+        bool IsExclusive
+        {
+            get;
+        }
+
+        /// <summary>
+        /// The current state of the promise.
+        /// </summary>
+        PromiseState State
+        {
+            get;
+        }
+
+        /// <summary>
+        /// Tries to cancel the promise or the complete chain.
+        /// </summary>
+        /// <param name="dependencies">Try to cancel the parent promise is it has the only one child</param>
+        /// <returns></returns>
+        bool Cancel(bool dependencies);
+    }
+}