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#region Copyright notice and license |
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// Copyright 2015, Google Inc. |
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// All rights reserved. |
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// |
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// Redistribution and use in source and binary forms, with or without |
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// modification, are permitted provided that the following conditions are |
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// met: |
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// |
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// * Redistributions of source code must retain the above copyright |
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// notice, this list of conditions and the following disclaimer. |
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// * Redistributions in binary form must reproduce the above |
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// copyright notice, this list of conditions and the following disclaimer |
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// in the documentation and/or other materials provided with the |
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// distribution. |
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// * Neither the name of Google Inc. nor the names of its |
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// contributors may be used to endorse or promote products derived from |
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// this software without specific prior written permission. |
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// |
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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#endregion |
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using System; |
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using System.Diagnostics; |
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using System.Runtime.CompilerServices; |
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using System.Runtime.InteropServices; |
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using System.Threading; |
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using System.Threading.Tasks; |
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using Grpc.Core.Internal; |
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using Grpc.Core.Utils; |
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namespace Grpc.Core.Internal |
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{ |
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/// <summary> |
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/// If error != null, there's been an error or operation has been cancelled. |
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/// </summary> |
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internal delegate void AsyncCompletionDelegate<T>(T result, Exception error); |
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/// <summary> |
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/// Helper for transforming AsyncCompletionDelegate into full-fledged Task. |
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/// </summary> |
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internal class AsyncCompletionTaskSource<T> |
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{ |
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readonly TaskCompletionSource<T> tcs = new TaskCompletionSource<T>(); |
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readonly AsyncCompletionDelegate<T> completionDelegate; |
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public AsyncCompletionTaskSource() |
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{ |
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completionDelegate = new AsyncCompletionDelegate<T>(HandleCompletion); |
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} |
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public Task<T> Task |
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{ |
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get |
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{ |
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return tcs.Task; |
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} |
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} |
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public AsyncCompletionDelegate<T> CompletionDelegate |
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{ |
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get |
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{ |
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return completionDelegate; |
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} |
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} |
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private void HandleCompletion(T value, Exception error) |
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{ |
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if (error == null) |
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{ |
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tcs.SetResult(value); |
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return; |
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} |
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if (error is OperationCanceledException) |
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{ |
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tcs.SetCanceled(); |
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return; |
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} |
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tcs.SetException(error); |
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} |
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} |
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} |
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