Initial checkin of gRPC to third_party/

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

+#region Copyright notice and license
+
+// 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.Threading.Tasks;
+using Grpc.Core.Internal;
+
+namespace Grpc.Core
+{
+    /// <summary>
+    /// Helper methods for generated clients to make RPC calls.
+    /// Most users will use this class only indirectly and will be 
+    /// making calls using client object generated from protocol
+    /// buffer definition files.
+    /// </summary>
+    public static class Calls
+    {
+        /// <summary>
+        /// Invokes a simple remote call in a blocking fashion.
+        /// </summary>
+        /// <returns>The response.</returns>
+        /// <param name="call">The call defintion.</param>
+        /// <param name="req">Request message.</param>
+        /// <typeparam name="TRequest">Type of request message.</typeparam>
+        /// <typeparam name="TResponse">The of response message.</typeparam>
+        public static TResponse BlockingUnaryCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call, TRequest req)
+            where TRequest : class
+            where TResponse : class
+        {
+            var asyncCall = new AsyncCall<TRequest, TResponse>(call);
+            return asyncCall.UnaryCall(req);
+        }
+
+        /// <summary>
+        /// Invokes a simple remote call asynchronously.
+        /// </summary>
+        /// <returns>An awaitable call object providing access to the response.</returns>
+        /// <param name="call">The call defintion.</param>
+        /// <param name="req">Request message.</param>
+        /// <typeparam name="TRequest">Type of request message.</typeparam>
+        /// <typeparam name="TResponse">The of response message.</typeparam>
+        public static AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call, TRequest req)
+            where TRequest : class
+            where TResponse : class
+        {
+            var asyncCall = new AsyncCall<TRequest, TResponse>(call);
+            var asyncResult = asyncCall.UnaryCallAsync(req);
+            return new AsyncUnaryCall<TResponse>(asyncResult, asyncCall.ResponseHeadersAsync, asyncCall.GetStatus, asyncCall.GetTrailers, asyncCall.Cancel);
+        }
+
+        /// <summary>
+        /// Invokes a server streaming call asynchronously.
+        /// In server streaming scenario, client sends on request and server responds with a stream of responses.
+        /// </summary>
+        /// <returns>A call object providing access to the asynchronous response stream.</returns>
+        /// <param name="call">The call defintion.</param>
+        /// <param name="req">Request message.</param>
+        /// <typeparam name="TRequest">Type of request message.</typeparam>
+        /// <typeparam name="TResponse">The of response messages.</typeparam>
+        public static AsyncServerStreamingCall<TResponse> AsyncServerStreamingCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call, TRequest req)
+            where TRequest : class
+            where TResponse : class
+        {
+            var asyncCall = new AsyncCall<TRequest, TResponse>(call);
+            asyncCall.StartServerStreamingCall(req);
+            var responseStream = new ClientResponseStream<TRequest, TResponse>(asyncCall);
+            return new AsyncServerStreamingCall<TResponse>(responseStream, asyncCall.ResponseHeadersAsync, asyncCall.GetStatus, asyncCall.GetTrailers, asyncCall.Cancel);
+        }
+
+        /// <summary>
+        /// Invokes a client streaming call asynchronously.
+        /// In client streaming scenario, client sends a stream of requests and server responds with a single response.
+        /// </summary>
+        /// <param name="call">The call defintion.</param>
+        /// <returns>An awaitable call object providing access to the response.</returns>
+        /// <typeparam name="TRequest">Type of request messages.</typeparam>
+        /// <typeparam name="TResponse">The of response message.</typeparam>
+        public static AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call)
+            where TRequest : class
+            where TResponse : class
+        {
+            var asyncCall = new AsyncCall<TRequest, TResponse>(call);
+            var resultTask = asyncCall.ClientStreamingCallAsync();
+            var requestStream = new ClientRequestStream<TRequest, TResponse>(asyncCall);
+            return new AsyncClientStreamingCall<TRequest, TResponse>(requestStream, resultTask, asyncCall.ResponseHeadersAsync, asyncCall.GetStatus, asyncCall.GetTrailers, asyncCall.Cancel);
+        }
+
+        /// <summary>
+        /// Invokes a duplex streaming call asynchronously.
+        /// In duplex streaming scenario, client sends a stream of requests and server responds with a stream of responses.
+        /// The response stream is completely independent and both side can be sending messages at the same time.
+        /// </summary>
+        /// <returns>A call object providing access to the asynchronous request and response streams.</returns>
+        /// <param name="call">The call definition.</param>
+        /// <typeparam name="TRequest">Type of request messages.</typeparam>
+        /// <typeparam name="TResponse">Type of reponse messages.</typeparam>
+        public static AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call)
+            where TRequest : class
+            where TResponse : class
+        {
+            var asyncCall = new AsyncCall<TRequest, TResponse>(call);
+            asyncCall.StartDuplexStreamingCall();
+            var requestStream = new ClientRequestStream<TRequest, TResponse>(asyncCall);
+            var responseStream = new ClientResponseStream<TRequest, TResponse>(asyncCall);
+            return new AsyncDuplexStreamingCall<TRequest, TResponse>(requestStream, responseStream, asyncCall.ResponseHeadersAsync, asyncCall.GetStatus, asyncCall.GetTrailers, asyncCall.Cancel);
+        }
+    }
+}