/*

* Copyright (c) 2002-2008 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:  system State monitor

*

*/

#ifndef __FM_SYSTEMSTATE_MONITOR__

#define __FM_SYSTEMSTATE_MONITOR__

#include <e32base.h>

#include <ssm/ssmstateawaresession.h>

/**

 * MFmSystemStateMonitorObserver

 * 

 * Monitor component observer.

 * 

 * @since S60 5.2

 */

class MFmSystemStateMonitorObserver

    {    

    public:

        /**

         * Called when the system State changed  

         */

        virtual void SystemStateChangedEvent() = 0;

    };

/**

 * CFmSystemStateMonitor

 * 

 * Component for monitoring system state

 * 

 * @since S60 5.2

 */  

class CFmSystemStateMonitor : public CActive

    {

    public:

        /**

         * Create new monitor

         * 

         * @param aObserver monitor observer

         * @since S60 5.2     

         */    

        static CFmSystemStateMonitor* NewL(

            MFmSystemStateMonitorObserver& aObserver );   

        /**

         * Destructor

         * 

         * @since S60 5.2     

         */    

        ~CFmSystemStateMonitor();

        /**

         * Start monitor

         * 

         * @param aStateToMonitor the state needs monitored

         * @since S60 5.2

         */        

        void StartMonitor( TUint aStateToMonitor );    

        /**

         * Indicate system state is normal or not

		 *       

         * @since S60 5.2

		 * @return ETrue if system state is normal, EFalse if not

         */ 

        TBool IsSystemStateNormal();

    private:

        /** 

         * C++ constructor

         *

         * @param aObserver monitor observer.   

         * @since S60 5.2      

         */        

        CFmSystemStateMonitor( MFmSystemStateMonitorObserver& aObserver );    

        /**

         * Symbian 2nd phase constructor

         * 

         * @since S60 5.2

         */        

        void ConstructL();

    private: // From CActive

        /**

         * From CActive

         */        

        void RunL();

        /**

         * From CActive         

         * @since S60 5.2

         */        

        void DoCancel(); 

        /**

         * From CActive         

         * @since S60 5.2

         */        

        TInt RunError( TInt aError );

    private:	

        // observer used to inform try schedule backup again when system state become normal

        MFmSystemStateMonitorObserver& iObserver;

        // State aware session.

        RSsmStateAwareSession iSAS;

        // State to monitor

        TUint iStateToMonitor;

    };

#endif // __FM_SYSTEMSTATE_MONITOR__