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/IProgressSource.cs

@@ -0,0 +1,45 @@
+#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>Provides progress reports for an <see cref="IAsyncTask" /></summary>
+  public interface IProgressSource {
+
+    /// <summary>Called when the asynchronous action has made progress</summary>
+    event EventHandler ProgressUpdated;
+
+    /// <summary>Current progress of the asynchronous action</summary>
+    float Progress { get; }
+
+  }
+
+  /// <summary>Provides progress reports with a status message</summary>
+  /// <typeparam name="TStatus">Type of status message the progress source provides</typeparam>
+  public interface IProgressSource<TStatus> : IProgressSource {
+
+    /// <summary>Current status of the asynchronous action</summary>
+    TStatus Status { get; }
+
+  }
+
+} // namespace Nuclex.Support.Async