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 Task<Metadata> responseHeadersAsync;
33 readonly Func<Status> getStatusFunc;
34 readonly Func<Metadata> getTrailersFunc;
35 readonly Action disposeAction;
39 /// Creates a new AsyncUnaryCall object with the specified properties.
41 /// <param name="responseAsync">The response of the asynchronous call.</param>
42 /// <param name="responseHeadersAsync">Response headers of the asynchronous call.</param>
43 /// <param name="getStatusFunc">Delegate returning the status of the call.</param>
44 /// <param name="getTrailersFunc">Delegate returning the trailing metadata of the call.</param>
45 /// <param name="disposeAction">Delegate to invoke when Dispose is called on the call object.</param>
46 public AsyncUnaryCall(Task<TResponse> responseAsync,
47 Task<Metadata> responseHeadersAsync,
48 Func<Status> getStatusFunc,
49 Func<Metadata> getTrailersFunc,
52 this.responseAsync = responseAsync;
53 this.responseHeadersAsync = responseHeadersAsync;
54 this.getStatusFunc = getStatusFunc;
55 this.getTrailersFunc = getTrailersFunc;
56 this.disposeAction = disposeAction;
60 /// Asynchronous call result.
62 public Task<TResponse> ResponseAsync
66 return this.responseAsync;
71 /// Asynchronous access to response headers.
73 public Task<Metadata> ResponseHeadersAsync
77 return this.responseHeadersAsync;
82 /// Allows awaiting this object directly.
84 public TaskAwaiter<TResponse> GetAwaiter()
86 return responseAsync.GetAwaiter();
90 /// Gets the call status if the call has already finished.
91 /// Throws InvalidOperationException otherwise.
93 public Status GetStatus()
95 return getStatusFunc();
99 /// Gets the call trailing metadata if the call has already finished.
100 /// Throws InvalidOperationException otherwise.
102 public Metadata GetTrailers()
104 return getTrailersFunc();
108 /// Provides means to cleanup after the call.
109 /// If the call has already finished normally (request stream has been completed and call result has been received), doesn't do anything.
110 /// Otherwise, requests cancellation of the call which should terminate all pending async operations associated with the call.
111 /// As a result, all resources being used by the call should be released eventually.
114 /// Normally, there is no need for you to dispose the call unless you want to utilize the
115 /// "Cancel" semantics of invoking <c>Dispose</c>.
117 public void Dispose()
119 disposeAction.Invoke();