/*

* Copyright (c) 2006-2010 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:  Main classes for Out of Memory Monitor.

*

*/

#include "oomoutofmemorywatcher.h"

#include "oommemorymonitor.h"

#include "OomTraces.h"

// ======================================================================

// class COutOfMemoryWatcher

// - notifies when free memory crosses preset thresholds

// ======================================================================

// ---------------------------------------------------------

//

// ---------------------------------------------------------

//

COutOfMemoryWatcher* COutOfMemoryWatcher::NewL(CMemoryMonitor& aMonitor, TInt aLowRamThreshold, TInt aGoodRamThreshold, TBool aSwapUsageMonitored, TInt aLowSwapThreshold, TInt aGoodSwapThreshold)

    {

    FUNC_LOG;

    COutOfMemoryWatcher* self = new (ELeave) COutOfMemoryWatcher(aMonitor, aSwapUsageMonitored);

    CleanupStack::PushL(self);

    self->ConstructL(aLowRamThreshold, aGoodRamThreshold, aLowSwapThreshold, aGoodSwapThreshold);

    CleanupStack::Pop(self);

    return self;

    }

// ---------------------------------------------------------

//

// ---------------------------------------------------------

//

COutOfMemoryWatcher::~COutOfMemoryWatcher()

    {

    FUNC_LOG;

    Cancel();

    }

// ---------------------------------------------------------

//

// ---------------------------------------------------------

//

COutOfMemoryWatcher::COutOfMemoryWatcher(CMemoryMonitor& aMonitor, TBool aSwapUsageMonitored)

:   CActive(CActive::EPriorityStandard),

    iMemoryMonitor(aMonitor),

    iSwapUsageMonitored(aSwapUsageMonitored)

    {

    FUNC_LOG;

    CActiveScheduler::Add(this);

    }

// ---------------------------------------------------------

//

// ---------------------------------------------------------

//

void COutOfMemoryWatcher::ConstructL(TInt aLowRamThreshold, TInt aGoodRamThreshold, TInt aLowSwapThreshold, TInt aGoodSwapThreshold)

    {

    FUNC_LOG;

    UserSvr::SetMemoryThresholds(aLowRamThreshold,aGoodRamThreshold);

    if (iSwapUsageMonitored)

        {

        SVMSwapThresholds thresholds;

        thresholds.iLowThreshold = aLowSwapThreshold;

        thresholds.iGoodThreshold = aGoodSwapThreshold;

        UserSvr::HalFunction(EHalGroupVM, EVMHalSetSwapThresholds, &thresholds, 0);

        }

    User::LeaveIfError(iChangeNotifier.Create());

    }

void COutOfMemoryWatcher::UpdateThresholds(TInt aLowRamThreshold, TInt aGoodRamThreshold, TInt aLowSwapThreshold, TInt aGoodSwapThreshold)

    {

    FUNC_LOG;

    UserSvr::SetMemoryThresholds(aLowRamThreshold,aGoodRamThreshold);

    if (iSwapUsageMonitored)

        {

        SVMSwapThresholds thresholds;

        thresholds.iLowThreshold = aLowSwapThreshold;

        thresholds.iGoodThreshold = aGoodSwapThreshold;

        UserSvr::HalFunction(EHalGroupVM, EVMHalSetSwapThresholds, &thresholds, 0);

        }

    }

// ---------------------------------------------------------

//

// ---------------------------------------------------------

//

void COutOfMemoryWatcher::Start()

    {

    FUNC_LOG;

    if (!IsActive())

        {

        iChangeNotifier.Logon(iStatus);

        SetActive();

        }

    }

// ---------------------------------------------------------

//

// ---------------------------------------------------------

//

void COutOfMemoryWatcher::DoCancel()

    {

    FUNC_LOG;

    iChangeNotifier.LogonCancel();

    }

// ---------------------------------------------------------

//

// ---------------------------------------------------------

//

void COutOfMemoryWatcher::RunL()

    {

    FUNC_LOG;

    TInt status = iStatus.Int();

    if (status < 0)

        {

        User::Leave(status);

        }

    // Check for memory status change.

    if (status & EChangesFreeMemory)

        {

        iMemoryMonitor.FreeMemThresholdCrossedL();

        }

    // We are not active until FreeMemThresholdCrossedL returns.

    Start();

    }