| #region Copyright notice and license |
| |
| // Copyright 2015 gRPC authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #endregion |
| |
| using System; |
| using System.Collections.Generic; |
| using System.Threading; |
| using System.Threading.Tasks; |
| |
| namespace Grpc.Core.Internal |
| { |
| internal class ClientResponseStream<TRequest, TResponse> : IAsyncStreamReader<TResponse> |
| where TRequest : class |
| where TResponse : class |
| { |
| readonly AsyncCall<TRequest, TResponse> call; |
| TResponse current; |
| |
| public ClientResponseStream(AsyncCall<TRequest, TResponse> call) |
| { |
| this.call = call; |
| } |
| |
| public TResponse Current |
| { |
| get |
| { |
| if (current == null) |
| { |
| throw new InvalidOperationException("No current element is available."); |
| } |
| return current; |
| } |
| } |
| |
| public async Task<bool> MoveNext(CancellationToken token) |
| { |
| var cancellationTokenRegistration = token.CanBeCanceled ? token.Register(() => call.Cancel()) : (IDisposable) null; |
| using (cancellationTokenRegistration) |
| { |
| var result = await call.ReadMessageAsync().ConfigureAwait(false); |
| this.current = result; |
| |
| if (result == null) |
| { |
| await call.StreamingResponseCallFinishedTask.ConfigureAwait(false); |
| return false; |
| } |
| return true; |
| } |
| } |
| |
| public void Dispose() |
| { |
| // TODO(jtattermusch): implement the semantics of stream disposal. |
| } |
| } |
| } |