/*

* 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:  Comms database notifier class definition

*

*/

#ifndef _CCMCOMMSDBNOTIFIER_H

#define _CCMCOMMSDBNOTIFIER_H

//  Include Files

#include <d32dbms.h>

// FORWARD DECLARATIONS

class CCommsDatabase;

class CCmScheduler;

// CLASS DECLARATION

/**

 *  Comms database notifier class for scheduler

 *  @lib cmscheduler.lib

 *  @since S60 5.1

 */

class CCmCommsDbNotifier : public CActive

    {

    public: // Constructors and destructor

        /**

         * Two-phased constructor.

         */

        static CCmCommsDbNotifier* NewL( CCmScheduler& aSheduler );

        /**

         * Destructor.

         */

        virtual ~CCmCommsDbNotifier();

        /**

         * Checks wlan scan state

         *

         * @since S60 5.1

         * @return TBool, ETrue if value changed, EFalse otherwise

         */

        TBool HasScanStateChangedL();

        /**

         * Gets wlan scan interval setting value

         *

         * @since S60 5.1

         * @return TUint32, scan interval

         */

        TUint32 WlanScanStateL();

    protected: // From CActive

        /**

         * Called when request completes

         *

         * @since S60 5.1

         */

        void RunL();

        /**

         * Called when request is cancelled

         *

         * @since S60 5.1

         */

        void DoCancel();

        /**

         * Called when RunL leaves

         *

         * @since S60 5.1

         */

        TInt RunError(TInt aError);

    private: // Constructors

        /**

         * Default constructor.

         */

        CCmCommsDbNotifier( CCmScheduler& aSheduler );

        /**

         * Two-phased constructor.

         */

        void ConstructL();

        /**

         * Initiates asyncronous notification request to database

         *

         * @since S60 5.1

         */

        void RequestNotification();

    private:

        /**

         * Database to be monitored

         */

        CCommsDatabase*                 iDb;    // owned

        /**

         * Change observer

         */

        CCmScheduler*                   iScheduler;  // not owned

        /**

         * Previous scan state

         */

        TUint32                         iScanState;

    };

#endif //  _CCMCOMMSDBNOTIFIER_H