/*

* Copyright (c) 2002 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:  

*     Reqisters Mce to LogEng to get notification about log DB changes.

*

*/

#ifndef __Mce_Engine_CMceLogNotify_H__

#define __Mce_Engine_CMceLogNotify_H__

//  INCLUDES

#include <e32base.h>

#include <f32file.h>

// FORWARD DECLARATIONS

class CLogClient;

class CMceLogEngine;

// CLASS DECLARATION

/**

 * Observer for the log database. Issues request to the underlying

 * asyncronous service provider, which tells if changes in the DB

 * had happened.

 */

class CMceLogNotify : public CActive

    {

    public:     // Constructors.

        /**

         * Standard creation function. Creates and returns a new object of this

         * class.

         *

         * @param aObserver pointer to observer.

         * @param aDelay notification delay in microseconds.

         * @return  pointer to CMceLogNotify instance.

         */

        static CMceLogNotify* NewL( CMceLogEngine* aObserver,

                                  TTimeIntervalMicroSeconds32 aDelay );

        /**

         *  Destructor.

         */

        ~CMceLogNotify();

        /**

         *  Issues request to asyncronous service provider

         */

        void IssueNotifyRequest();

    private:    // Constructions.

        /**

         * Constructor, second phase.

         */

        void ConstructL();

        /**

         * Default Constructor

         */

        CMceLogNotify();

        /**

         * Constructor

         *

         * @param aObserver pointer to observer.

         * @param aDelay notification delay in microseconds.

         */

        CMceLogNotify( CMceLogEngine* aObserver,

                     TTimeIntervalMicroSeconds32 aDelay);

    private:     // Operations from CActive

        /**

         * This is called when a request to a log engine is completed.

         */

        void RunL();

        /**

         * Cancels active request.

         */

        void DoCancel();

    private: // data

        /// Ref: Messaging Centre log engine.

        CMceLogEngine* iObserver;

        /// Own: File System session

        RFs iFsSession;

        /// Own: Pointer to the log client.

        CLogClient* iLogClient;

        /// Own: Notification delay in microseconds.

        TTimeIntervalMicroSeconds32 iDelay;

    };

#endif // __Mce_Engine_CMceLogNotify_H__

// End of file