Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core/Internal/ServerRequestStream.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
 
 using System;
-using System.IO;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
 
-namespace Google.Protobuf.ProtoDump
+namespace Grpc.Core.Internal
 {
-    /// <summary>
-    /// Small utility to load a binary message and dump it in JSON format.
-    /// </summary>
-    internal class Program
+    internal class ServerRequestStream<TRequest, TResponse> : IAsyncStreamReader<TRequest>
+        where TRequest : class
+        where TResponse : class
     {
-        private static int Main(string[] args)
+        readonly AsyncCallServer<TRequest, TResponse> call;
+        TRequest current;
+
+        public ServerRequestStream(AsyncCallServer<TRequest, TResponse> call)
         {
-            if (args.Length != 2)
+            this.call = call;
+        }
+
+        public TRequest Current
+        {
+            get
             {
-                Console.Error.WriteLine("Usage: Google.Protobuf.JsonDump <descriptor type name> <input data>");
-                Console.Error.WriteLine("The descriptor type name is the fully-qualified message name,");
-                Console.Error.WriteLine("including assembly e.g. ProjectNamespace.Message,Company.Project");
-                return 1;
+                if (current == null)
+                {
+                    throw new InvalidOperationException("No current element is available.");
+                }
+                return current;
             }
-            Type type = Type.GetType(args[0]);
-            if (type == null)
+        }
+
+        public async Task<bool> MoveNext(CancellationToken token)
+        {
+            if (token != CancellationToken.None)
             {
-                Console.Error.WriteLine("Unable to load type {0}.", args[0]);
-                return 1;
+                throw new InvalidOperationException("Cancellation of individual reads is not supported.");
             }
-            if (!typeof(IMessage).IsAssignableFrom(type))
-            {
-                Console.Error.WriteLine("Type {0} doesn't implement IMessage.", args[0]);
-                return 1;
-            }
-            IMessage message = (IMessage) Activator.CreateInstance(type);
-            using (var input = File.OpenRead(args[1]))
-            {
-                message.MergeFrom(input);
-            }
-            Console.WriteLine(message);
-            return 0;
+            var taskSource = new AsyncCompletionTaskSource<TRequest>();
+            call.StartReadMessage(taskSource.CompletionDelegate);
+            var result = await taskSource.Task.ConfigureAwait(false);
+            this.current = result;
+            return result != null;
+        }
+
+        public void Dispose()
+        {
+            // TODO(jtattermusch): implement the semantics of stream disposal.
         }
     }
-}
+}