Added a set of interfaces implementing async methods in a plain enough way to support coroutines, RPC and P/Invokes; updated copyright statement for the year 2017

git-svn-id: file:///srv/devel/repo-conversion/nusu@329 d2e56fa2-650e-0410-a79f-9358c0239efd

Source/Async/ICancellable.cs

@@ -0,0 +1,35 @@
+#region CPL License
+/*
+Nuclex Framework
+Copyright (C) 2002-2017 Nuclex Development Labs
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the IBM Common Public License as
+published by the IBM Corporation; either version 1.0 of the
+License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+IBM Common Public License for more details.
+
+You should have received a copy of the IBM Common Public
+License along with this library
+*/
+#endregion
+
+using System;
+
+namespace Nuclex.Support.Async {
+
+  /// <summary>
+  ///   Can be implemented by an <see cref="IAsyncTask" /> to support cancellation
+  /// </summary>
+  public interface ICancellable {
+
+    /// <summary>Cancels the asynchronous action if it is running</summary>
+    void Cancel();
+
+  }
+
+} // namespace Nuclex.Support.Async