| #region Copyright notice and license |
| |
| // Copyright 2019 The gRPC Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #endregion |
| |
| |
| using System; |
| using System.Threading.Tasks; |
| |
| namespace Grpc.Core |
| { |
| /// <summary> |
| /// Provides an abstraction over the callback providers |
| /// used by AsyncUnaryCall, AsyncDuplexStreamingCall, etc |
| /// </summary> |
| internal struct AsyncCallState |
| { |
| readonly object responseHeadersAsync; // Task<Metadata> or Func<object, Task<Metadata>> |
| readonly object getStatusFunc; // Func<Status> or Func<object, Status> |
| readonly object getTrailersFunc; // Func<Metadata> or Func<object, Metadata> |
| readonly object disposeAction; // Action or Action<object> |
| readonly object callbackState; // arg0 for the callbacks above, if needed |
| |
| internal AsyncCallState( |
| Func<object, Task<Metadata>> responseHeadersAsync, |
| Func<object, Status> getStatusFunc, |
| Func<object, Metadata> getTrailersFunc, |
| Action<object> disposeAction, |
| object callbackState) |
| { |
| this.responseHeadersAsync = responseHeadersAsync; |
| this.getStatusFunc = getStatusFunc; |
| this.getTrailersFunc = getTrailersFunc; |
| this.disposeAction = disposeAction; |
| this.callbackState = callbackState; |
| } |
| |
| internal AsyncCallState( |
| Task<Metadata> responseHeadersAsync, |
| Func<Status> getStatusFunc, |
| Func<Metadata> getTrailersFunc, |
| Action disposeAction) |
| { |
| this.responseHeadersAsync = responseHeadersAsync; |
| this.getStatusFunc = getStatusFunc; |
| this.getTrailersFunc = getTrailersFunc; |
| this.disposeAction = disposeAction; |
| this.callbackState = null; |
| } |
| |
| internal Task<Metadata> ResponseHeadersAsync() |
| { |
| var withState = responseHeadersAsync as Func<object, Task<Metadata>>; |
| return withState != null ? withState(callbackState) |
| : (Task<Metadata>)responseHeadersAsync; |
| } |
| |
| internal Status GetStatus() |
| { |
| var withState = getStatusFunc as Func<object, Status>; |
| return withState != null ? withState(callbackState) |
| : ((Func<Status>)getStatusFunc)(); |
| } |
| |
| internal Metadata GetTrailers() |
| { |
| var withState = getTrailersFunc as Func<object, Metadata>; |
| return withState != null ? withState(callbackState) |
| : ((Func<Metadata>)getTrailersFunc)(); |
| } |
| |
| internal void Dispose() |
| { |
| var withState = disposeAction as Action<object>; |
| if (withState != null) |
| { |
| withState(callbackState); |
| } |
| else |
| { |
| ((Action)disposeAction)(); |
| } |
| } |
| } |
| } |