1 #region Copyright notice and license
3 // Copyright 2015 gRPC authors.
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
9 // http://www.apache.org/licenses/LICENSE-2.0
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.
20 using System.Threading.Tasks;
25 /// Return type for bidirectional streaming calls.
27 /// <typeparam name="TRequest">Request message type for this call.</typeparam>
28 /// <typeparam name="TResponse">Response message type for this call.</typeparam>
29 public sealed class AsyncDuplexStreamingCall<TRequest, TResponse> : IDisposable
31 readonly IClientStreamWriter<TRequest> requestStream;
32 readonly IAsyncStreamReader<TResponse> responseStream;
33 readonly Task<Metadata> responseHeadersAsync;
34 readonly Func<Status> getStatusFunc;
35 readonly Func<Metadata> getTrailersFunc;
36 readonly Action disposeAction;
39 /// Creates a new AsyncDuplexStreamingCall object with the specified properties.
41 /// <param name="requestStream">Stream of request values.</param>
42 /// <param name="responseStream">Stream of response values.</param>
43 /// <param name="responseHeadersAsync">Response headers of the asynchronous call.</param>
44 /// <param name="getStatusFunc">Delegate returning the status of the call.</param>
45 /// <param name="getTrailersFunc">Delegate returning the trailing metadata of the call.</param>
46 /// <param name="disposeAction">Delegate to invoke when Dispose is called on the call object.</param>
47 public AsyncDuplexStreamingCall(IClientStreamWriter<TRequest> requestStream,
48 IAsyncStreamReader<TResponse> responseStream,
49 Task<Metadata> responseHeadersAsync,
50 Func<Status> getStatusFunc,
51 Func<Metadata> getTrailersFunc,
54 this.requestStream = requestStream;
55 this.responseStream = responseStream;
56 this.responseHeadersAsync = responseHeadersAsync;
57 this.getStatusFunc = getStatusFunc;
58 this.getTrailersFunc = getTrailersFunc;
59 this.disposeAction = disposeAction;
63 /// Async stream to read streaming responses.
65 public IAsyncStreamReader<TResponse> ResponseStream
69 return responseStream;
74 /// Async stream to send streaming requests.
76 public IClientStreamWriter<TRequest> RequestStream
85 /// Asynchronous access to response headers.
87 public Task<Metadata> ResponseHeadersAsync
91 return this.responseHeadersAsync;
96 /// Gets the call status if the call has already finished.
97 /// Throws InvalidOperationException otherwise.
99 public Status GetStatus()
101 return getStatusFunc();
105 /// Gets the call trailing metadata if the call has already finished.
106 /// Throws InvalidOperationException otherwise.
108 public Metadata GetTrailers()
110 return getTrailersFunc();
114 /// Provides means to cleanup after the call.
115 /// If the call has already finished normally (request stream has been completed and response stream has been fully read), doesn't do anything.
116 /// Otherwise, requests cancellation of the call which should terminate all pending async operations associated with the call.
117 /// As a result, all resources being used by the call should be released eventually.
120 /// Normally, there is no need for you to dispose the call unless you want to utilize the
121 /// "Cancel" semantics of invoking <c>Dispose</c>.
123 public void Dispose()
125 disposeAction.Invoke();