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.Runtime.CompilerServices;
21 using System.Threading.Tasks;
26 /// Return type for single request - single response call.
28 /// <typeparam name="TResponse">Response message type for this call.</typeparam>
29 public sealed class AsyncUnaryCall<TResponse> : IDisposable
31 readonly Task<TResponse> responseAsync;
32 readonly AsyncCallState callState;
36 /// Creates a new AsyncUnaryCall object with the specified properties.
38 /// <param name="responseAsync">The response of the asynchronous call.</param>
39 /// <param name="responseHeadersAsync">Response headers of the asynchronous call.</param>
40 /// <param name="getStatusFunc">Delegate returning the status of the call.</param>
41 /// <param name="getTrailersFunc">Delegate returning the trailing metadata of the call.</param>
42 /// <param name="disposeAction">Delegate to invoke when Dispose is called on the call object.</param>
43 public AsyncUnaryCall(Task<TResponse> responseAsync,
44 Task<Metadata> responseHeadersAsync,
45 Func<Status> getStatusFunc,
46 Func<Metadata> getTrailersFunc,
49 this.responseAsync = responseAsync;
50 this.callState = new AsyncCallState(responseHeadersAsync, getStatusFunc, getTrailersFunc, disposeAction);
54 /// Creates a new AsyncUnaryCall object with the specified properties.
56 /// <param name="responseAsync">The response of the asynchronous call.</param>
57 /// <param name="responseHeadersAsync">Response headers of the asynchronous call.</param>
58 /// <param name="getStatusFunc">Delegate returning the status of the call.</param>
59 /// <param name="getTrailersFunc">Delegate returning the trailing metadata of the call.</param>
60 /// <param name="disposeAction">Delegate to invoke when Dispose is called on the call object.</param>
61 /// <param name="state">State object for use with the callback parameters.</param>
62 public AsyncUnaryCall(Task<TResponse> responseAsync,
63 Func<object, Task<Metadata>> responseHeadersAsync,
64 Func<object, Status> getStatusFunc,
65 Func<object, Metadata> getTrailersFunc,
66 Action<object> disposeAction,
69 this.responseAsync = responseAsync;
70 callState = new AsyncCallState(responseHeadersAsync, getStatusFunc, getTrailersFunc, disposeAction, state);
74 /// Asynchronous call result.
76 public Task<TResponse> ResponseAsync
80 return this.responseAsync;
85 /// Asynchronous access to response headers.
87 public Task<Metadata> ResponseHeadersAsync
91 return callState.ResponseHeadersAsync();
96 /// Allows awaiting this object directly.
98 public TaskAwaiter<TResponse> GetAwaiter()
100 return responseAsync.GetAwaiter();
104 /// Gets the call status if the call has already finished.
105 /// Throws InvalidOperationException otherwise.
107 public Status GetStatus()
109 return callState.GetStatus();
113 /// Gets the call trailing metadata if the call has already finished.
114 /// Throws InvalidOperationException otherwise.
116 public Metadata GetTrailers()
118 return callState.GetTrailers();
122 /// Provides means to cleanup after the call.
123 /// If the call has already finished normally (request stream has been completed and call result has been received), doesn't do anything.
124 /// Otherwise, requests cancellation of the call which should terminate all pending async operations associated with the call.
125 /// As a result, all resources being used by the call should be released eventually.
128 /// Normally, there is no need for you to dispose the call unless you want to utilize the
129 /// "Cancel" semantics of invoking <c>Dispose</c>.
131 public void Dispose()