1 files changed, 60 insertions, 0 deletions
diff --git a/samples/DotNetOpenAuth.ApplicationBlock/HttpAsyncHandlerBase.cs b/samples/DotNetOpenAuth.ApplicationBlock/HttpAsyncHandlerBase.cs
new file mode 100644
index 0000000..a72a9b1
--- /dev/null
+++ b/samples/DotNetOpenAuth.ApplicationBlock/HttpAsyncHandlerBase.cs
@@ -0,0 +1,60 @@
+//-----------------------------------------------------------------------
+// <copyright file="HttpAsyncHandlerBase.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.ApplicationBlock {
+	using System;
+	using System.Collections.Generic;
+	using System.Linq;
+	using System.Text;
+	using System.Threading;
+	using System.Threading.Tasks;
+	using System.Web;
+
+	public abstract class HttpAsyncHandlerBase : IHttpAsyncHandler {
+		public abstract bool IsReusable { get; }
+
+		public IAsyncResult BeginProcessRequest(HttpContext context, System.AsyncCallback cb, object extraData) {
+			return ToApm(this.ProcessRequestAsync(context), cb, extraData);
+		}
+
+		public void EndProcessRequest(IAsyncResult result) {
+			((Task)result).Wait(); // rethrows exceptions
+		}
+
+		public void ProcessRequest(HttpContext context) {
+			this.ProcessRequestAsync(context).GetAwaiter().GetResult();
+		}
+
+		protected abstract Task ProcessRequestAsync(HttpContext context);
+
+		private static Task ToApm(Task task, AsyncCallback callback, object state) {
+			if (task == null) {
+				throw new ArgumentNullException("task");
+			}
+
+			var tcs = new TaskCompletionSource<object>(state);
+			task.ContinueWith(
+				t => {
+					if (t.IsFaulted) {
+						tcs.TrySetException(t.Exception.InnerExceptions);
+					} else if (t.IsCanceled) {
+						tcs.TrySetCanceled();
+					} else {
+						tcs.TrySetResult(null);
+					}
+
+					if (callback != null) {
+						callback(tcs.Task);
+					}
+				},
+				CancellationToken.None,
+				TaskContinuationOptions.None,
+				TaskScheduler.Default);
+
+			return tcs.Task;
+		}
+	}
+}