/*

* Copyright (c) 2008 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:  Notifier class for any change in Storage API database.

*

*/

#ifndef C_EVTDBNOTIFIER_H

#define C_EVTDBNOTIFIER_H

// System Includes

//  System Includes

#include <e32base.h>

// User Includes

// User Includes

#include "evtdbobserver.h"

#include "evtstoragedbobserver.h"

#include "evtstoragedomaincrkeys.h"

// Forward Declarations

class CRepository;

// extern data types

// global Functions

// constants go here

/**

 *  Class that monitors Storage Database for any change.

 *  This class requests for any change in the Stroage database. 

 *

 *  @lib evtstorage.lib

 *  @since S60 v9.1

 */

class CEvtDbNotifier : public CActive

    {  

public:

    /**

     * Constructs a new instance of Event Notifier.

     *

     * @return The new instance of Event Notifier.

     * @leave System wide error code if the object creation fails.         

     */

    static CEvtDbNotifier* NewL( MEvtDbObserver&    aObserver );

    /**

     * Constructs a new instance of Event Notifier.

     * Leaves the created instance on the cleanup stack.

     *

     * @return The new instance of Event Notifier object.

     * @leave System wide error code if the object creation fails.         

     */

    static CEvtDbNotifier* NewLC( MEvtDbObserver&    aObserver );  

    /**

     * Destructor

     */

    virtual ~CEvtDbNotifier ();

    /**

     * Observer for TDbChangeType changes in Storage Database.

     */

    void DbChangedL( );

	// Inherited from CActive 

    void RunL();

    void DoCancel();

    TInt RunError( TInt aError ); 

private: 

    /**

     * Handle any change to database.

     */   

    void HandleDbChangedL( );

    /**

     * Request to get database notifications on change.

     */   

    void StartNotification();

    /**

     * Default C++ Constructor.

     */

    CEvtDbNotifier( MEvtDbObserver&    aObserver ); 

    /**

     * Second phase of the two phase constructor.

     */

    void ConstructL();

private: // data

    /**

     *  Reference to Observer

     * 	Does Not own

     */

    MEvtDbObserver&					iDbObserver;

    /**

     *  CRepository Instance

     */

    CRepository*                    iRepository;

    };

#endif // C_EVTDBNOTIFIER_H