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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,98 @@ | ||
| #region Copyright notice and license | ||
|
|
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| // 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 | ||
|
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||
|
|
||
| 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; | ||
| } | ||
|
|
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| 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)(); | ||
| } | ||
| } | ||
| } | ||
| } |
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