/*

* Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

#include "ccontactdbeventqueue.h"

#include <cntdb.h>

CContactDbEventQueue* CContactDbEventQueue::NewL

        (CContactDatabase* aDb, TInt aMaxQueueSize)

    {

    CContactDbEventQueue* self = new(ELeave) CContactDbEventQueue;

    CleanupStack::PushL(self);

    self->ConstructL(aDb,aMaxQueueSize);

    CleanupStack::Pop(self);

    return self;

    }

CContactDbEventQueue::~CContactDbEventQueue()

    {

    CTimer::Cancel();

    if (iNotifier)

        {

        delete iNotifier;

        }

    }

void CContactDbEventQueue::PopEvent()

	{	

	 if (!iQueue.IsEmpty())

     	{

     	iQueue.PopHead();

     	}

	}

void CContactDbEventQueue::Clear()

	{	

	 while(!iQueue.IsEmpty())

     	{

     	iQueue.PopHead();

     	}

	}

TBool CContactDbEventQueue::ListenForEvent(TTimeIntervalSeconds aTimeOut, TContactDbObserverEvent& aEvent)

    {

    CTimer::Cancel();

    if (iQueue.IsEmpty())

        {

        CTimer::After(aTimeOut.Int() * 1000000);

        CActiveScheduler::Start();

        }

    if (!iQueue.IsEmpty())

        {

        aEvent = iQueue.Head();

        iQueue.PopHead();

        return ETrue;

        }

    else

        {

        return EFalse;

        }

    }

void CContactDbEventQueue::RunL()

    {

    // Timer expired

    CActiveScheduler::Stop();

    }

void CContactDbEventQueue::HandleDatabaseEventL

        (TContactDbObserverEvent aEvent)

    {

    const TBool KTimerActive = CTimer::IsActive();

    CTimer::Cancel();

	TBool eventPushed = iQueue.Push(aEvent);

	__ASSERT_ALWAYS(eventPushed,User::Invariant());  // ensure push was successful

    if (KTimerActive)

        {

        CActiveScheduler::Stop();

        }

    }

CContactDbEventQueue::CContactDbEventQueue()

    : CTimer(CActive::EPriorityStandard)

    {

    }

void CContactDbEventQueue::ConstructL

        (CContactDatabase* aDb, TInt aMaxQueueSize)

    {

    CTimer::ConstructL();

    iQueue.ConstructL(aMaxQueueSize);

    CActiveScheduler::Add(this);

    if (aDb)

        {

        iNotifier = CContactChangeNotifier::NewL(*aDb, this);

        }

    }