loggingservices/eventlogger/LogServ/src/LogServOperationQueue.cpp
author hgs
Thu, 12 Aug 2010 11:53:23 +0100
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permissions -rw-r--r--
201031_02
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// Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#include "LogServOperationQueue.h"
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// User includes
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#include "logservpanic.h"
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#include "LogServOperationBase.h"
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#include "LogServTaskInterface.h"
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/////////////////////////////////////////////////////////////////////////////////////////
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// -----> CLogServOperationQueue (source)
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/////////////////////////////////////////////////////////////////////////////////////////
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CLogServOperationQueue::CLogServOperationQueue(MLogServTaskInterface& aTaskInterface, TInt aPriority)
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:	CActive(aPriority),
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	iTaskInterface(aTaskInterface),
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	iQueuePending(CLogServOperationBase::QueueOffset()),
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	iQueueCompleted(CLogServOperationBase::QueueOffset())
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	{
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	CActiveScheduler::Add(this);
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	}
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CLogServOperationQueue::~CLogServOperationQueue()
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	{
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	Cancel();
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	//
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	CLogServOperationBase* item = NULL;
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	//
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	TSglQueIter<CLogServOperationBase> pendingIterator(iQueuePending);
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	while ((item = pendingIterator++) != NULL)
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		{
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		delete item;
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		}
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	//
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	TSglQueIter<CLogServOperationBase> completedIterator(iQueueCompleted);
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	while ((item = completedIterator++) != NULL)
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		{
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		delete item;
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		}
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	}
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CLogServOperationQueue* CLogServOperationQueue::NewL(MLogServTaskInterface& aTaskInterface, TInt aPriority)
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	{
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	CLogServOperationQueue* self = new(ELeave) CLogServOperationQueue(aTaskInterface, aPriority);
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	return self;
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	}
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/////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////
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void CLogServOperationQueue::OMOperationQueueAdd(CLogServOperationBase& aOp)
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//
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//	Add a new event to the queue and restart processing if necessary
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//
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	{
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	LOGTEXT3("CLogServOperationQueue::OMOperationQueueAdd() - Type: %d, Id: %d", aOp.Type(), aOp.Id());
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	//
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	iQueuePending.AddLast(aOp);
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	if	(!IsActive())
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		CompleteRequest();
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	//
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	LOGTEXT("CLogServOperationQueue::OMOperationQueueAdd() - end");
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	}
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//
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//	Removes an operation from the relevant server queue
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//
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void CLogServOperationQueue::OMOperationQueueRemove(CLogServOperationBase& aOperation)
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	{
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	const TLogOperationId operationId = aOperation.Id();
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	const TLogServSessionId sessionId = aOperation.SessionId();
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	//
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	LOGTEXT3("CLogServOperationQueue::OMOperationQueueRemove() - Id: %d, SessionId: %d", operationId, sessionId);
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	//
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	if(QueueContainsOperation(iQueuePending, operationId, sessionId))
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		{
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		iQueuePending.Remove(aOperation);
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		}
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	else
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		{
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		iQueueCompleted.Remove(aOperation);
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		}
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	//
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	LOGTEXT("CLogServOperationQueue::OMOperationQueueRemove() - end");
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	}
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void CLogServOperationQueue::OMGetResultL(TLogOperationId aId, TLogServSessionId aSessionId, const RMessage2& aMessageToWriteTo)
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//
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//	Get the result of a specific operation
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//
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	{
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	LOGTEXT3("CLogServOperationQueue::OMGetResultL() - Id: %d, SessionId: %d", aId, aSessionId);
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	// Look for the op
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	CLogServOperationBase* op = FindOperation(iQueueCompleted, aId, aSessionId);
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	// If we found it, then return the result
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	if	(op != NULL)
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		{
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		op->WriteL(aMessageToWriteTo);
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		delete op;
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		}
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	//
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	LOGTEXT("CLogServOperationQueue::OMGetResultL() - end");
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	}
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   121
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void CLogServOperationQueue::OMCancel(TLogOperationId aOpId, TLogServSessionId aSessionId, TBool aCompleteRequest)
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//
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//	Cancel a specific operation
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//
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	{
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	LOGTEXT4("CLogServOperationQueue::OMCancel() - Id: %d, SessionId: %d, CompleteRequest: %d", aOpId, aSessionId, aCompleteRequest);
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   128
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	if	(iCurrentOperation && iCurrentOperation->SessionId() == aSessionId && (aOpId == KLogNullOperationId || iCurrentOperation->Id() == aOpId))
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		{
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		// We need to cancel the current active operation because it belongs to this session
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		//
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		// This should complete the request with KErrCancel causing RunL to leave
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		// RunError completes the request and removes the operation from the pending queue
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		iTaskInterface.TaskCancelCurrent();
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0
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		//
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		// Do not complete the message when the operation completes
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		//
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		if (!aCompleteRequest)
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			{
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			iCurrentOperation->SetMessageCompletion(aCompleteRequest);
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			}
0
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		}
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	else
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		{
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		// The active operation doesn't belong to this session - just remove any relevant operations from the queues
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		//
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		// We are taking advantage of the fact that a session will only ever have one operation outstanding
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		// so a cancel request basically means - cancel everything belonging to the session
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		CLogServOperationBase* op = NULL;
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		while((op = FindOperation(iQueuePending, aOpId, aSessionId)) != NULL)
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			{
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			if	(aCompleteRequest)
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				{
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				op->Cancel();
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				}
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   158
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			// The operation dequeues itself from the containing queue in its destructor via
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			// the MLogServOperationManager abstract interface.
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			delete op;
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			// We can exit now if we were looking for a particular operation
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			if	(aOpId > KLogNullOperationId)
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				{
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				return;
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				}
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			}
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   169
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		// Just delete the completed operation
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		DeleteFromQueue(iQueueCompleted, aOpId, aSessionId);
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		}
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	//
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	LOGTEXT("CLogServOperationQueue::OMCancel() - end");
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	}
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   176
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//
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//	Stop/cancel and delete all operations belonging to a particular session
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//	If the session has just died we don't want to complete the request - the kernel would panic us
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//
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void CLogServOperationQueue::OMCancel(TLogServSessionId aSessionId, TBool aCompleteRequest)
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	{
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	OMCancel(KLogNullOperationId, aSessionId, aCompleteRequest);
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	}
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   185
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/////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////
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   189
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void CLogServOperationQueue::RunL()
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//
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//	Called to indicate that the operation has completed - so complete the client request
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//
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	{
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	LOGTEXT2("CLogServOperationQueue::RunL(%d)", iStatus.Int());
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   196
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	// If the queue has just been restarted there won't be an existing operation
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	if (iCurrentOperation)
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   199
		{
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		LOGTEXT3("CLogServOperationQueue::RunL() - Current operation Type: %d, Id: %d,", iCurrentOperation->Type(), iCurrentOperation->Id());
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   201
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		// Handle errors in RunError
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		User::LeaveIfError(iStatus.Int());
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   204
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		// Remember the type of operation for later
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		const TLogOperationType type = iCurrentOperation->Type();
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   207
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		// Complete the operation
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		if	(iCurrentOperation->CompleteProcessingL(iStatus.Int()) == CLogServOperationBase::EOperationComplete)
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			{
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			LOGTEXT("CLogServOperationQueue::RunL() - Operation is complete, deleting it");
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			delete iCurrentOperation;
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			iCurrentOperation = NULL;
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   214
			}
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		else
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			{
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			// The client is going to ask for some results.
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			//
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			// Move the operation to another queue until it's done
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			// The session will actually delete the operation
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			LOGTEXT("CLogServOperationQueue::RunL() - Operation result awaiting client fetch");
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			iQueuePending.Remove(*iCurrentOperation);
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			iQueueCompleted.AddLast(*iCurrentOperation);
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   224
			}
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   225
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		// Any errors from maintenance will be ignored because the operation is null
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		iCurrentOperation = NULL;
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   228
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		LOGTEXT("CLogServOperationQueue::RunL() - Starting maintenance");
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		iTaskInterface.TaskMaintenanceStartL(iStatus, type != ELogOperationEventGet);
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		SetActive();
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		}
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	else
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		{
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		LOGTEXT("CLogServOperationQueue::RunL() - finding next operation");
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		// Start the next operation
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		StartNextOpL();
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		}
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	LOGTEXT("CLogServOperationQueue::RunL() - end");
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	}
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void CLogServOperationQueue::DoCancel()
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//
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//	Implements cancel policy. Only called if the maintenance is active?
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//
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	{
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	iTaskInterface.TaskCancelCurrent();
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	}
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TInt CLogServOperationQueue::RunError(TInt aError)
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//
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//	Handle errors
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//
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   256
	{
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	LOGTEXT2("CLogServOperationQueue::RunError(%d)", aError);
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	if	(iCurrentOperation)
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		{
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		LOGTEXT3("CLogServOperationQueue::RunError() - Current operation Type: %d, Id: %d,", iCurrentOperation->Type(), iCurrentOperation->Id());
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		// Fail the client request with the error
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		if	(iCurrentOperation->HaveMessagePointer())
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			iCurrentOperation->Complete(aError);
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		delete iCurrentOperation;
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		iCurrentOperation = NULL;
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		}
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	// Restart by mending the database if necessary
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	TRAPD(mendError, iTaskInterface.TaskMaintenanceStartL(iStatus, ETrue));
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	if	(mendError)
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		{
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		LOGTEXT2("CLogServOperationQueue::RunError() - mend error: %d)", mendError);
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   275
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		// Just ignore the maintenance error and complete ourselves so we continue to execute operations
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		CompleteRequest(KErrNone);
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		}
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	else
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		{
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		LOGTEXT("CLogServOperationQueue::RunError() - setting active again");
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		SetActive();
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   283
		}
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	LOGTEXT("CLogServOperationQueue::RunError() - end");
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	return KErrNone;
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	}
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   288
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void CLogServOperationQueue::CompleteRequest(TInt aCompletionCode)
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	{
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	TRequestStatus* status = &iStatus;
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	User::RequestComplete(status, aCompletionCode);
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	SetActive();
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   294
	}
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   295
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   296
void CLogServOperationQueue::StartNextOpL()
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   297
//
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   298
//	Start the next operation on the queue
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   299
//
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   300
	{
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   301
	LOGTEXT("CLogServOperationQueue::StartNextOpL()");
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   302
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	iCurrentOperation = NULL;
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   304
	if (!IsActive() && !iQueuePending.IsEmpty())
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   305
		{
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		iCurrentOperation = iQueuePending.First();
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diff changeset
   307
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		LOGTEXT3("CLogServOperationQueue::StartNextOpL() - New next operation, Type: %d, Id: %d", iCurrentOperation->Type(), iCurrentOperation->Id());
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   309
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		iCurrentOperation->StartL(iStatus);
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		SetActive();
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   312
		}
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parents:
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   313
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   314
	LOGTEXT("CLogServOperationQueue::StartNextOpL() - end");
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   315
	}
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parents:
diff changeset
   316
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   317
void CLogServOperationQueue::DeleteFromQueue(TSglQue<CLogServOperationBase>& aQueue, TLogOperationId aOperationId, TLogServSessionId aSessionId)
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   318
//
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   319
//	Delete all operations belonging to a particular session from a queue
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   320
//
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parents:
diff changeset
   321
	{
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   322
	LOGTEXT3("CLogServOperationQueue::DeleteFromQueue() - aId: %d, aSessionId: %d", aOperationId, aSessionId);
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parents:
diff changeset
   323
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   324
	CLogServOperationBase* op = NULL;
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parents:
diff changeset
   325
	while((op = FindOperation(aQueue, aOperationId, aSessionId)) != NULL)
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diff changeset
   326
		{
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   327
		delete op;
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parents:
diff changeset
   328
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   329
		// We can exit now if we were looking for a particular operation
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parents:
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   330
		if	(aOperationId > KLogNullOperationId)
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parents:
diff changeset
   331
			{
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parents:
diff changeset
   332
			LOGTEXT("CLogServOperationQueue::DeleteFromQueue() - operation found successfully");
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diff changeset
   333
			return;
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parents:
diff changeset
   334
			}
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parents:
diff changeset
   335
		}
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parents:
diff changeset
   336
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diff changeset
   337
#ifdef LOGGING_ENABLED
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parents:
diff changeset
   338
	if	(aOperationId != KLogNullOperationId)
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parents:
diff changeset
   339
		{
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parents:
diff changeset
   340
		LOGTEXT2("CLogServOperationQueue::DeleteFromQueue() - operation id '%d' wasn't found!", aOperationId);
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		}
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#endif
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	LOGTEXT("CLogServOperationQueue::DeleteFromQueue() - end");
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	}
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   346
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TBool CLogServOperationQueue::QueueContainsOperation(TSglQue<CLogServOperationBase>& aQueue, TLogOperationId aOperationId, TLogServSessionId aSessionId)
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//
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//	Finds an operation in a queue
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//
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	{
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	LOGTEXT3("CLogServOperationQueue::QueueContainsOperation() - aId: %d, aSessionId: %d", aOperationId, aSessionId);
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   353
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	TSglQueIter<CLogServOperationBase> iter(aQueue);
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	CLogServOperationBase* item = NULL;
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   356
	
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	while ((item = iter++) != NULL)
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		{
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		if	(item->Id() == aOperationId && item->SessionId() == aSessionId)
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			{
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			LOGTEXT("CLogServOperationQueue::QueueContainsOperation() - operation found within queue");
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			return ETrue;
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			}
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		}
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   365
	
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	LOGTEXT("CLogServOperationQueue::QueueContainsOperation() - queue doesn't contain operation");
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	return EFalse;
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	}
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   369
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CLogServOperationBase* CLogServOperationQueue::FindOperation(TSglQue<CLogServOperationBase>& aQueue, TLogOperationId aOperationId, TLogServSessionId aSessionId)
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//
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//	Find the first operation in a queue belonging to a particular session
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//
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	{
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	LOGTEXT3("CLogServOperationQueue::FindOperation() - aId: %d, aSessionId: %d", aOperationId, aSessionId);
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   376
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	TSglQueIter<CLogServOperationBase> iter(aQueue);
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	CLogServOperationBase* item = NULL;
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   379
	
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	while ((item = iter++) != NULL)
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		{
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		if	(item->SessionId() == aSessionId && (aOperationId == KLogNullOperationId || item->Id() == aOperationId))
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			{
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			LOGTEXT("CLogServOperationQueue::FindOperation() - operation found successfully");
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			return item;
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			}
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		}
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   388
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	LOGTEXT("CLogServOperationQueue::FindOperation() - operation not found");
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	return NULL;	
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	}