Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core/ChannelState.cs

 #region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 #endregion
 
-namespace Google.Protobuf.Reflection
+using System;
+
+namespace Grpc.Core
 {
     /// <summary>
-    /// Interface implemented by all descriptor types.
+    /// Connectivity state of a channel.
+    /// Based on grpc_connectivity_state from grpc/grpc.h
     /// </summary>
-    public interface IDescriptor
+    public enum ChannelState
     {
         /// <summary>
-        /// Returns the name of the entity (message, field etc) being described.
+        /// Channel is idle
         /// </summary>
-        string Name { get; }
+        Idle,
 
         /// <summary>
-        /// Returns the fully-qualified name of the entity being described.
+        /// Channel is connecting
         /// </summary>
-        string FullName { get; }
+        Connecting,
 
         /// <summary>
-        /// Returns the descriptor for the .proto file that this entity is part of.
+        /// Channel is ready for work
         /// </summary>
-        FileDescriptor File { get; }
-    }    
-}
+        Ready,
+
+        /// <summary>
+        /// Channel has seen a failure but expects to recover
+        /// </summary>
+        TransientFailure,
+
+        /// <summary>
+        /// Channel has seen a failure that it cannot recover from
+        /// </summary>
+        FatalFailure
+    }
+}