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 server streaming calls.
27 /// <typeparam name="TResponse">Response message type for this call.</typeparam>
28 public sealed class AsyncServerStreamingCall<TResponse> : IDisposable
30 readonly IAsyncStreamReader<TResponse> responseStream;
31 readonly AsyncCallState callState;
34 /// Creates a new AsyncDuplexStreamingCall object with the specified properties.
36 /// <param name="responseStream">Stream of response values.</param>
37 /// <param name="responseHeadersAsync">Response headers of the asynchronous call.</param>
38 /// <param name="getStatusFunc">Delegate returning the status of the call.</param>
39 /// <param name="getTrailersFunc">Delegate returning the trailing metadata of the call.</param>
40 /// <param name="disposeAction">Delegate to invoke when Dispose is called on the call object.</param>
41 public AsyncServerStreamingCall(IAsyncStreamReader<TResponse> responseStream,
42 Task<Metadata> responseHeadersAsync,
43 Func<Status> getStatusFunc,
44 Func<Metadata> getTrailersFunc,
47 this.responseStream = responseStream;
48 this.callState = new AsyncCallState(responseHeadersAsync, getStatusFunc, getTrailersFunc, disposeAction);
52 /// Creates a new AsyncDuplexStreamingCall object with the specified properties.
54 /// <param name="responseStream">Stream of response values.</param>
55 /// <param name="responseHeadersAsync">Response headers of the asynchronous call.</param>
56 /// <param name="getStatusFunc">Delegate returning the status of the call.</param>
57 /// <param name="getTrailersFunc">Delegate returning the trailing metadata of the call.</param>
58 /// <param name="disposeAction">Delegate to invoke when Dispose is called on the call object.</param>
59 /// <param name="state">State object for use with the callback parameters.</param>
60 public AsyncServerStreamingCall(IAsyncStreamReader<TResponse> responseStream,
61 Func<object, Task<Metadata>> responseHeadersAsync,
62 Func<object, Status> getStatusFunc,
63 Func<object, Metadata> getTrailersFunc,
64 Action<object> disposeAction,
67 this.responseStream = responseStream;
68 this.callState = new AsyncCallState(responseHeadersAsync, getStatusFunc, getTrailersFunc, disposeAction, state);
72 /// Async stream to read streaming responses.
74 public IAsyncStreamReader<TResponse> ResponseStream
78 return responseStream;
83 /// Asynchronous access to response headers.
85 public Task<Metadata> ResponseHeadersAsync
89 return callState.ResponseHeadersAsync();
94 /// Gets the call status if the call has already finished.
95 /// Throws InvalidOperationException otherwise.
97 public Status GetStatus()
99 return callState.GetStatus();
103 /// Gets the call trailing metadata if the call has already finished.
104 /// Throws InvalidOperationException otherwise.
106 public Metadata GetTrailers()
108 return callState.GetTrailers();
112 /// Provides means to cleanup after the call.
113 /// If the call has already finished normally (response stream has been fully read), doesn't do anything.
114 /// Otherwise, requests cancellation of the call which should terminate all pending async operations associated with the call.
115 /// As a result, all resources being used by the call should be released eventually.
118 /// Normally, there is no need for you to dispose the call unless you want to utilize the
119 /// "Cancel" semantics of invoking <c>Dispose</c>.
121 public void Dispose()