Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.ServiceModel/System/ServiceModel/Channels/LayeredChannel.cs

@@ -0,0 +1,89 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace System.ServiceModel.Channels
+{
+    using System.ServiceModel.Channels;
+    using System.Runtime;
+
+    // 
+    abstract class LayeredChannel<TInnerChannel> : ChannelBase
+        where TInnerChannel : class, IChannel
+    {
+        TInnerChannel innerChannel;
+        EventHandler onInnerChannelFaulted;
+
+        protected LayeredChannel(ChannelManagerBase channelManager, TInnerChannel innerChannel)
+            : base(channelManager)
+        {
+            Fx.Assert(innerChannel != null, "innerChannel cannot be null");
+
+            this.innerChannel = innerChannel;
+            this.onInnerChannelFaulted = new EventHandler(OnInnerChannelFaulted);
+            this.innerChannel.Faulted += this.onInnerChannelFaulted;
+        }
+
+        protected TInnerChannel InnerChannel
+        {
+            get { return this.innerChannel; }
+        }
+
+        public override T GetProperty<T>()
+        {
+            T baseProperty = base.GetProperty<T>();
+            if (baseProperty != null)
+            {
+                return baseProperty;
+            }
+
+            return this.InnerChannel.GetProperty<T>();
+        }
+
+        protected override void OnClosing()
+        {
+            this.innerChannel.Faulted -= this.onInnerChannelFaulted;
+            base.OnClosing();
+        }
+
+        protected override void OnAbort()
+        {
+            this.innerChannel.Abort();
+        }
+
+        protected override void OnClose(TimeSpan timeout)
+        {
+            this.innerChannel.Close(timeout);
+        }
+
+        protected override IAsyncResult OnBeginClose(TimeSpan timeout, AsyncCallback callback, object state)
+        {
+            return this.innerChannel.BeginClose(timeout, callback, state);
+        }
+
+        protected override void OnEndClose(IAsyncResult result)
+        {
+            this.innerChannel.EndClose(result);
+        }
+
+        protected override void OnOpen(TimeSpan timeout)
+        {
+            this.innerChannel.Open(timeout);
+        }
+
+        protected override IAsyncResult OnBeginOpen(TimeSpan timeout, AsyncCallback callback, object state)
+        {
+            return this.innerChannel.BeginOpen(timeout, callback, state);
+        }
+
+        protected override void OnEndOpen(IAsyncResult result)
+        {
+            this.innerChannel.EndOpen(result);
+        }
+
+        void OnInnerChannelFaulted(object sender, EventArgs e)
+        {
+            Fault();
+        }
+    }
+}