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WebServiceTarget - FlushAsync - Avoid premature flush (#1868)
* WebServiceTarget - FlushAsync - Keeps track of pendingRequests to avoid premature flush * WebServiceTarget - FlushAsync - Just keep track of pending request count * Merge https://github.com/NLog/NLog into WebServiceTargetFlush * WebServiceTarget - FlushAsync - Just keep track of pending request count (Test)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| // | ||
| // Copyright (c) 2004-2016 Jaroslaw Kowalski <jaak@jkowalski.net>, Kim Christensen, Julian Verdurmen | ||
| // | ||
| // All rights reserved. | ||
| // | ||
| // Redistribution and use in source and binary forms, with or without | ||
| // modification, are permitted provided that the following conditions | ||
| // are met: | ||
| // | ||
| // * Redistributions of source code must retain the above copyright notice, | ||
| // this list of conditions and the following disclaimer. | ||
| // | ||
| // * Redistributions in binary form must reproduce the above copyright notice, | ||
| // this list of conditions and the following disclaimer in the documentation | ||
| // and/or other materials provided with the distribution. | ||
| // | ||
| // * Neither the name of Jaroslaw Kowalski nor the names of its | ||
| // contributors may be used to endorse or promote products derived from this | ||
| // software without specific prior written permission. | ||
| // | ||
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
| // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | ||
| // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
| // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
| // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
| // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | ||
| // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
| // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | ||
| // THE POSSIBILITY OF SUCH DAMAGE. | ||
| // | ||
|
|
||
| namespace NLog.Internal | ||
| { | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using NLog.Common; | ||
|
|
||
| /// <summary> | ||
| /// Keeps track of pending operation count, and can notify when pending operation count reaches zero | ||
| /// </summary> | ||
| internal class AsyncOperationCounter | ||
| { | ||
| private int _pendingOperationCounter; | ||
| private readonly LinkedList<AsyncContinuation> _pendingCompletionList = new LinkedList<AsyncContinuation>(); | ||
|
|
||
| /// <summary> | ||
| /// Mark operation has started | ||
| /// </summary> | ||
| public void BeginOperation() | ||
| { | ||
| System.Threading.Interlocked.Increment(ref _pendingOperationCounter); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Mark operation has completed | ||
| /// </summary> | ||
| /// <param name="exception">Exception coming from the completed operation [optional]</param> | ||
| public void CompleteOperation(Exception exception) | ||
| { | ||
| if (_pendingCompletionList.Count > 0) | ||
| { | ||
| lock (_pendingCompletionList) | ||
| { | ||
| System.Threading.Interlocked.Decrement(ref _pendingOperationCounter); | ||
| var nodeNext = _pendingCompletionList.First; | ||
| while (nodeNext != null) | ||
| { | ||
| var nodeValue = nodeNext.Value; | ||
| nodeNext = nodeNext.Next; | ||
| nodeValue(exception); // Will modify _pendingCompletionList | ||
| } | ||
| } | ||
| } | ||
| else | ||
| { | ||
| System.Threading.Interlocked.Decrement(ref _pendingOperationCounter); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Registers an AsyncContinuation to be called when all pending operations have completed | ||
| /// </summary> | ||
| /// <param name="asyncContinuation">Invoked on completion</param> | ||
| /// <returns>AsyncContinuation operation</returns> | ||
| public AsyncContinuation RegisterCompletionNotification(AsyncContinuation asyncContinuation) | ||
| { | ||
| if (_pendingOperationCounter == 0) | ||
| { | ||
| return asyncContinuation; | ||
| } | ||
| else | ||
| { | ||
| lock (_pendingCompletionList) | ||
| { | ||
| var pendingCompletion = new LinkedListNode<AsyncContinuation>(null); | ||
| _pendingCompletionList.AddLast(pendingCompletion); | ||
|
|
||
| // We only want to wait for the operations currently in progress (not the future operations) | ||
| int remainingCompletionCounter = System.Threading.Interlocked.Increment(ref _pendingOperationCounter); | ||
| if (remainingCompletionCounter <= 0) | ||
| { | ||
| System.Threading.Interlocked.Exchange(ref _pendingOperationCounter, 0); | ||
| _pendingCompletionList.Remove(pendingCompletion); | ||
| return asyncContinuation; | ||
| } | ||
|
|
||
| pendingCompletion.Value = (ex) => | ||
| { | ||
| if (System.Threading.Interlocked.Decrement(ref remainingCompletionCounter) == 0) | ||
| { | ||
| lock (_pendingCompletionList) | ||
| { | ||
| System.Threading.Interlocked.Decrement(ref _pendingOperationCounter); | ||
| _pendingCompletionList.Remove(pendingCompletion); | ||
| var nodeNext = _pendingCompletionList.First; | ||
| while (nodeNext != null) | ||
| { | ||
| var nodeValue = nodeNext.Value; | ||
| nodeNext = nodeNext.Next; | ||
| nodeValue(ex); // Will modify _pendingCompletionList | ||
| } | ||
| } | ||
| asyncContinuation(ex); | ||
| } | ||
| }; | ||
|
|
||
| return pendingCompletion.Value; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Clear o | ||
| /// </summary> | ||
| public void Clear() | ||
| { | ||
| _pendingCompletionList.Clear(); | ||
| } | ||
| } | ||
| } |
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