Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

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

@@ -0,0 +1,73 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+namespace System.ServiceModel.Channels
+{
+    using System.Collections.ObjectModel;
+    using System.ServiceModel;
+
+    // Neighbor interface
+    interface IPeerNeighbor : IExtensibleObject<IPeerNeighbor>
+    {
+        bool IsConnected { get; }       // True if the neighbor is connected
+        PeerNodeAddress ListenAddress { get; set; }   // Neighbor's listen address
+        bool IsInitiator { get; }
+        ulong NodeId { get; set; }      // NodeID of the neighboring node
+        PeerNeighborState State { get; set; }
+        bool IsClosing { get; }
+        IAsyncResult BeginSend(Message message, AsyncCallback callback, object state);
+        IAsyncResult BeginSend(Message message, TimeSpan timeout, AsyncCallback callback, object state);
+        void EndSend(IAsyncResult result);
+        void Send(Message message);
+        bool TrySetState(PeerNeighborState state);
+        void Abort(PeerCloseReason reason, PeerCloseInitiator initiator);
+        Message RequestSecurityToken(Message request);
+        void Ping(Message request);
+        UtilityExtension Utility { get; }
+    }
+
+    // Neighbor states
+    // If add new states, carefully consider where they should occur in state transition and make
+    // appropriate changes to PeerNeighbor implementation.
+    enum PeerNeighborState
+    {
+        Created,
+        Opened,
+        Authenticated,
+        Connecting,
+        Connected,
+        Disconnecting,
+        Disconnected,
+        Faulted,
+        Closed,
+    }
+
+    static class PeerNeighborStateHelper
+    {
+        // Returns true if the specified state can be set for the neighbor
+        public static bool IsSettable(PeerNeighborState state)
+        {
+            return (
+                    (state == PeerNeighborState.Authenticated) ||
+                    (state == PeerNeighborState.Connecting) ||
+                    (state == PeerNeighborState.Connected) ||
+                    (state == PeerNeighborState.Disconnecting) ||
+                    (state == PeerNeighborState.Disconnected));
+        }
+
+        // Returns true if the specified state is a "connected" state
+        public static bool IsConnected(PeerNeighborState state)
+        {
+            return ((state == PeerNeighborState.Connected));
+        }
+
+        // Returns true if the specified state is either authenticated or closing
+        public static bool IsAuthenticatedOrClosed(PeerNeighborState state)
+        {
+            return ((state == PeerNeighborState.Authenticated) ||
+                     (state == PeerNeighborState.Faulted) ||
+                     (state == PeerNeighborState.Closed));
+        }
+
+    }
+}