/*

* Copyright (c) 2008-2009 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: Listen cellular data usage key changes in central repository.

*

*/

#ifndef MPMDATAUSAGEWATCHER_H

#define MPMDATAUSAGEWATCHER_H

//  INCLUDES

#include <e32base.h>

class CRepository;

class CMPMServer;

// Stop after this many consecutive central repository errors.

const TInt KMpmDataUsageWatcherCenRepErrorThreshold = 80;

/**

 *  Class for accessing central repository.

 *  Follows KCurrentCellularDataUsage key in central repository.

 *  @since 5.2

 */

class CMpmDataUsageWatcher : public CActive

    {

public:

    /**

    * New for calling the two-phased constructor.

    */

    static CMpmDataUsageWatcher* NewL( CMPMServer* aServer );

    /**

    * Destructor.

    */

    virtual ~CMpmDataUsageWatcher();

    /**

     * Start to listen for events.

     */

    void StartL();

    /**

    * Active object's RunL.

    */

    void RunL();

    /**

    * Active object's DoCancel.

    */

    void DoCancel();

    /**

    * Current cellular data usage.

    * See TCmCellularDataUsage

    */

    TInt CellularDataUsage() const;

private:

    /**

    * C++ default constructor.

    */

    CMpmDataUsageWatcher( CMPMServer* aServer );

    /**

    * Symbian 2nd phase constructor.

    */

    void ConstructL();

    /**

    * Request for notifications.

    */

    TInt RequestNotifications();

    /**

    * Get current cellular data usage value.

    */

    TInt GetCurrentDataUsageValue();

private: // data

    /**

     * Central repository handle.

     * Own.

     */

    CRepository* iRepository;

    /**

     * Data usage value.

     */

    TInt iCellularDataUsage;     // type: TCmCellularDataUsage

    /**

     * Pointer to the MPM Server object.

     * Not own.

     */

    CMPMServer* iServer;

    /**

     * Error counter.

     */

    TUint iErrorCounter;

    };

#endif // MPMDATAUSAGEWATCHER_H