1 #region Copyright notice and license 2 3 // Copyright 2015 gRPC authors. 4 // 5 // Licensed under the Apache License, Version 2.0 (the "License"); 6 // you may not use this file except in compliance with the License. 7 // You may obtain a copy of the License at 8 // 9 // http://www.apache.org/licenses/LICENSE-2.0 10 // 11 // Unless required by applicable law or agreed to in writing, software 12 // distributed under the License is distributed on an "AS IS" BASIS, 13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 // See the License for the specific language governing permissions and 15 // limitations under the License. 16 17 #endregion 18 19 using System; 20 using System.Collections.Generic; 21 using System.Threading; 22 using System.Threading.Tasks; 23 24 namespace Grpc.Core.Internal 25 { 26 internal class ServerRequestStream<TRequest, TResponse> : IAsyncStreamReader<TRequest> 27 where TRequest : class 28 where TResponse : class 29 { 30 readonly AsyncCallServer<TRequest, TResponse> call; 31 TRequest current; 32 ServerRequestStream(AsyncCallServer<TRequest, TResponse> call)33 public ServerRequestStream(AsyncCallServer<TRequest, TResponse> call) 34 { 35 this.call = call; 36 } 37 38 public TRequest Current 39 { 40 get 41 { 42 if (current == null) 43 { 44 throw new InvalidOperationException("No current element is available."); 45 } 46 return current; 47 } 48 } 49 MoveNext(CancellationToken token)50 public async Task<bool> MoveNext(CancellationToken token) 51 { 52 53 var cancellationTokenRegistration = token.CanBeCanceled ? token.Register(() => call.Cancel()) : (IDisposable) null; 54 using (cancellationTokenRegistration) 55 { 56 var result = await call.ReadMessageAsync().ConfigureAwait(false); 57 this.current = result; 58 return result != null; 59 } 60 } 61 Dispose()62 public void Dispose() 63 { 64 // TODO(jtattermusch): implement the semantics of stream disposal. 65 } 66 } 67 } 68