imported signalr 1.1.3 into NzbDrone.

src/Microsoft.AspNet.SignalR.Core/Hosting/HostDependencyResolverExtensions.cs

@@ -0,0 +1,52 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.md in the project root for license information.
+
+using System;
+using System.Threading;
+using Microsoft.AspNet.SignalR.Infrastructure;
+
+namespace Microsoft.AspNet.SignalR.Hosting
+{
+    public static class HostDependencyResolverExtensions
+    {
+        public static void InitializeHost(this IDependencyResolver resolver, string instanceName, CancellationToken hostShutdownToken)
+        {
+            if (resolver == null)
+            {
+                throw new ArgumentNullException("resolver");
+            }
+
+            if (String.IsNullOrEmpty(instanceName))
+            {
+                throw new ArgumentNullException("instanceName");
+            }
+
+            // Initialize the performance counters
+            resolver.InitializePerformanceCounters(instanceName, hostShutdownToken);
+
+            // Dispose the dependency resolver on host shut down (cleanly)
+            resolver.InitializeResolverDispose(hostShutdownToken);
+        }
+
+        private static void InitializePerformanceCounters(this IDependencyResolver resolver, string instanceName, CancellationToken hostShutdownToken)
+        {
+            var counters = resolver.Resolve<IPerformanceCounterManager>();
+            if (counters != null)
+            {
+                counters.Initialize(instanceName, hostShutdownToken);
+            }
+        }
+
+        private static void InitializeResolverDispose(this IDependencyResolver resolver, CancellationToken hostShutdownToken)
+        {
+            // TODO: Guard against multiple calls to this
+
+            // When the host triggers the shutdown token, dispose the resolver
+            hostShutdownToken.Register(state =>
+            {
+                ((IDependencyResolver)state).Dispose();
+            },
+            resolver,
+            useSynchronizationContext: false);
+        }
+    }
+}