loggingservices/eventlogger/LogServ/src/LogNotify.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 22 Jan 2010 11:06:30 +0200
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permissions -rw-r--r--
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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 "LogNotify.h"
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#include "logservpanic.h"
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#include "LogServBackupInterface.h"
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#include "LogServDatabaseChangeInterface.h"
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CLogNotify::CLogNotify(MLogServBackupInterface& aBackupInterface, MLogServDatabaseChangeInterface& aChangeInterface, TInt aPriority)
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:	CTimer(aPriority), iBackupInterface(aBackupInterface), iChangeInterface(aChangeInterface), iCompleteClientMessage(ETrue)
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	{
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	CActiveScheduler::Add(this);
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	}
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CLogNotify::~CLogNotify()
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	{
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	LOGTEXT("CLogNotify::~CLogNotify()");
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	// This will only complete the client-side request if its not already
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	// been completed
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	Cancel();
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	//
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	iChangeInterface.DCIRequestChangeNotificationsCancel(*this);
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	iBackupInterface.BIObserverRemove(*this);
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	LOGTEXT("CLogNotify::~CLogNotify() - end");
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	}
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void CLogNotify::ConstructL()
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	{
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	LOGTEXT("CLogNotify::ConstructL()");
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	CTimer::ConstructL();
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	// Register for change events
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	iChangeInterface.DCIRequestChangeNotificationsL(*this);
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	// Register for backup events
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	iBackupInterface.BIObserverAddL(*this, MLogServBackupInterface::EObjectClientChangeNotifications);
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	LOGTEXT("CLogNotify::ConstructL() - end");
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	}
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CLogNotify* CLogNotify::NewL(MLogServBackupInterface& aBackupInterface, MLogServDatabaseChangeInterface& aChangeInterface, TInt aPriority)
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	{
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	CLogNotify* self = new(ELeave)CLogNotify(aBackupInterface, aChangeInterface, aPriority);
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	CleanupStack::PushL(self);
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	self->ConstructL();
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	CleanupStack::Pop(); // self
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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 CLogNotify::DCOHandleChangeEventsL(const CLogChangeDefinition& /*aChanges*/)
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//
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//	Handle changes within the log database
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//
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	{
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	LOGTEXT2("CLogNotify::DCOHandleChangeEventsL() - client thread is: %S", &iClientThreadName);
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	// Increment number of changes but only notify the client side request
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	// if the delay timer isn't running.
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	++iCommit;
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	//
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	if	(!IsActive())
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		CheckForChanges();
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	LOGTEXT("CLogNotify::DCOHandleChangeEventsL() - end");
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	}
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/////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////
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void CLogNotify::BOHandleEventL(TLogServBackupEvent aEvent)
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	{
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	switch(aEvent)
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		{
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	case EBackupStarting:
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		LOGTEXT("CLogNotify::BOHandleEventL(EBackupStarting)");
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		// A rather inelegant fix but gets rid of one whole class
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		iCompleteClientMessage = EFalse;
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		Cancel();
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		iCompleteClientMessage = ETrue;
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		break;
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	case EBackupEnded:
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		LOGTEXT("CLogNotify::BOHandleEventL(EBackupEnded)");
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		// Simulate a change
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		++iCommit;
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		if	(!IsActive())
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			CheckForChanges();
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		break;
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		}
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	LOGTEXT("CLogNotify::BOHandleEventL() - end");
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	}
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/////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////
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void CLogNotify::Notify(TTimeIntervalMicroSeconds32 aDelay, const RMessage2& aMessage)
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	{
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#ifdef LOGGING_ENABLED
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	RThread t;
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	aMessage.Client(t);
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	iClientThreadName = t.Name();
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	t.Close();
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	LOGTEXT3("CLogNotify::Notify(%d, %S)", aDelay.Int(), &iClientThreadName);
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#endif
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	__ASSERT_DEBUG(!IsActive(), Panic(ELogAlreadyActive18));
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	Cancel();
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	// Reset our change counter
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	if (iLastCommit == 0)
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		iLastCommit = iCommit;
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	// Save a message pointer to client request status
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	iMessagePtr = aMessage;
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	// Wait until the delay has passed before notifying clients of changes
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	After(aDelay);
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	LOGTEXT("CLogNotify::Notify() - end");
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	}
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/////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////
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void CLogNotify::Cancel()
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	{
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	LOGTEXT2("CLogNotify::Cancel() - client thread is: %S", &iClientThreadName);
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	CActive::Cancel();
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	// Reset
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	iLastCommit = 0;
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	// Complete the client-side observer
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	if	(iCompleteClientMessage)
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		CompleteClientRequest(KErrCancel);
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	LOGTEXT("CLogNotify::Cancel() - end");
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	}
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void CLogNotify::RunL()
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//
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//	RunL is called if the timer has expired
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//
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	{
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	LOGTEXT3("CLogNotify::RunL(%d) - client thread is: %S", iStatus.Int(), &iClientThreadName);
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	CheckForChanges();
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	LOGTEXT("CLogNotify::RunL() - end");
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	}
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void CLogNotify::DoCancel()
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	{
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	LOGTEXT2("CLogNotify::DoCancel() - client thread is: %S", &iClientThreadName);
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	// This is what really cancel's us
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	CTimer::DoCancel();
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	LOGTEXT("CLogNotify::DoCancel() - end");
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	}
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/////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////
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void CLogNotify::CheckForChanges()
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	{
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	LOGTEXT4("CLogNotify::CheckForChanges() - iLastCommit = %d, iCommit = %d, client thread name: %S", iLastCommit, iCommit, &iClientThreadName);
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	if	(iLastCommit != iCommit)
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		{
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		LOGTEXT("CLogNotify::CheckForChanges() - changes detected, attempting to notify client");
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		iLastCommit = iCommit;
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		CompleteClientRequest(RDbNotifier::ECommit);
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		}
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	LOGTEXT("CLogNotify::CheckForChanges() - end");
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	}
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void CLogNotify::CompleteClientRequest(TInt aCompletionCode)
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	{
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	LOGTEXT3("CLogNotify::CompleteClientRequest() - aCompletionCode = %d, thread: %S", aCompletionCode, &iClientThreadName);
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	if	(!iMessagePtr.IsNull())
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		{
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		LOGTEXT2("CLogNotify::CompleteClientRequest() - completing outstanding client request status for thread: %S", &iClientThreadName);
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		iMessagePtr.Complete(aCompletionCode);
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		}
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	else
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		{
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		LOGTEXT2("CLogNotify::CompleteClientRequest() - thread %S doesn't have an outstanding notification request", &iClientThreadName);
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		}
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	LOGTEXT("CLogNotify::CompleteClientRequest() - end");
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	}