/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbCore module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this file.

** Please review the following information to ensure the GNU Lesser General

** Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

****************************************************************************/

#include "hbsharedmemorymanagerut_p.h"

#include <QSharedMemory>

#include <QString>

#include <QDebug>

#include "hbthemecommon_p.h"

#define HB_THEME_SHARED_AUTOTEST_CHUNK "hbthemesharedautotest"

HbSharedMemoryManagerUt * HbSharedMemoryManagerUt::memManager = 0;

/**

 * initialize

 */

bool HbSharedMemoryManagerUt::initialize()

{

    bool success = false;

    if ( !chunk ) {

        chunk = new QSharedMemory(HB_THEME_SHARED_AUTOTEST_CHUNK);

        success = chunk->create( CACHE_SIZE, QSharedMemory::ReadWrite );

        // If SharedMemory Already Exists.

        // (This can happpen if ThemeServer crashed without releasing QSharedMemory)

        if ( !success && QSharedMemory::AlreadyExists == chunk->error() ) {

            success = chunk->attach( QSharedMemory::ReadWrite );

        }

        writable = true;

        if ( !success ) {

#ifdef THEME_SERVER_TRACES

            qDebug() << "HbSharedMemoryManager:: Could not initialize shared memory chunk";

#endif //THEME_SERVER_TRACES

            delete chunk; 

            chunk = 0;

        }

    }

    if (success) {

        // if we are recovering from theme server crash, shared chunk may

        // already be ready

        HbSharedChunkHeader *chunkHeader = (HbSharedChunkHeader*)(chunk->data());

        if (chunkHeader->identifier == INITIALIZED_CHUNK_IDENTIFIER) {

            // just reconnect allocators to the shared chunk

            mainAllocator->initialize(chunk, chunkHeader->mainAllocatorOffset);

            subAllocator->initialize(chunk, chunkHeader->subAllocatorOffset, mainAllocator);

        } else {

            chunkHeader->mainAllocatorOffset = sizeof(HbSharedChunkHeader);

            mainAllocator->initialize(chunk, chunkHeader->mainAllocatorOffset);

            chunkHeader->subAllocatorOffset = alloc(SPACE_NEEDED_FOR_MULTISEGMENT_ALLOCATOR);

            subAllocator->initialize(chunk, chunkHeader->subAllocatorOffset, mainAllocator);

            chunkHeader->identifier = INITIALIZED_CHUNK_IDENTIFIER;

        }

		success = true;

	}

    return success;

}

/**

 * c'tor 

 */

HbSharedMemoryManagerUt::HbSharedMemoryManagerUt()

{

}

/**

 * d'tor 

 */

HbSharedMemoryManagerUt::~HbSharedMemoryManagerUt()

{

}

/**

 * to change access right..

 */

void HbSharedMemoryManagerUt::setWritable( bool readWrite )

{

    writable = readWrite;

}

/**

 * to get instance of HbSharedMemoryManagerUt

 */

HbMemoryManager * HbSharedMemoryManagerUt::instance()

{

    if( !memManager ){

        memManager = new HbSharedMemoryManagerUt();

        if( !memManager->initialize() ) {

            qWarning( "HbSharedMemoryManager:Could not initialize shared memory" );

            delete memManager;

            memManager = 0;

        }

    }

    return memManager;

}

/**

 * to release instance of HbSharedMemoryManagerUt

 */

void HbSharedMemoryManagerUt::releaseInstance()

{

    delete memManager;

    memManager = 0;

}