/*

* 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 the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

* which accompanies this distribution, and is available

* at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Declaration of classes CActiveApDb

*               and MActiveApDbObserver.

*

*/

#ifndef ACTIVE_APDB_H

#define ACTIVE_APDB_H

// Deprecation warning

#warning This header file has been deprecated. Will be removed in one of the next SDK releases.

//  INCLUDES

#include <commdb.h>

#include <ApEngineVer.h>

/*

// Enum for DATABASE_TYPE field

// Will be deprecated in 7.0

enum TCommDbDatabaseType

    {

    EUnspecified = 0,   // not specifying which type it is - any type of 

                        // database can be opened with this parameter

    EIAP,

    EISP

    };

*/

// CONSTANTS

const TInt KErrActiveApDbObserverNotFound = -500;

// FORWARD DECLARATION

class CActiveApDbNotifier;

// CLASS DECLARATION

/**

* Mixin protocol for handling events from a CCommsDatabase.

* Events are related to database changes and availability.

*/

class MActiveApDbObserver

    {

    public:     // types

        enum TEvent       /// Events reported to the database observer.

            {

            EDbChanged,   ///< Database has changed.

            EDbClosing,   ///< Database is about to close.

            EDbAvailable  ///< Database is available again.(E.g. after unlock)

            };

    public:     // new methods

        /**

        * Derived classes should implement this method, and act accordingly

        * to database events.

        * @param anEvent Database-related event.

        *

        * @deprecated

        */

        IMPORT_C virtual void HandleApDbEventL( TEvent anEvent ) = 0;

    };

/**

* This class manages and guards database integrity

* by handling all events that are related to the database. These events

* may originate from the system (Shutdown, Backup/Restore) and from the

* database itself. The events are transformed into a simple protocol,

* defined by MActiveApDbObserver.

* Expects an active scheduler to be installed and running.

*/

NONSHARABLE_CLASS( CActiveApDb ) : public CBase

    {

    public:     // Constructors and destructor

        /**

        * Two-phased constructor. Leaves on failure.

        * @param aType The desired type of the CCommsDatabase object.

        * Defaults to EDatabaseTypeIAP.

        * @return The constructed CActiveApDb object.

        *

        * @deprecated

        */

        IMPORT_C static CActiveApDb* NewL

            ( TCommDbDatabaseType aType = EDatabaseTypeIAP );

        /**

        * Destructor.

        *

        * @deprecated

        */

        IMPORT_C virtual ~CActiveApDb();

    protected:  // Constructors

        /**

        * Second phase constructor. Leaves on failure.

        * @param aType The desired type of the CCommsDatabase object.

        * events.

        */

        void ConstructL();

    public:     // new methods

        /**

        * Adds an observer to the list of observers to be notified

        * about the DB events.

        * Also automatically starts observation and notification.

        * The order of notification will be exactly the order of registration.

        * @param anObserver Observer to be notified about database-related

        * events.

        *

        * @deprecated

        */

        IMPORT_C void AddObserverL( MActiveApDbObserver* anObserver );

        /**

        * Removes an observer. If not added, silently ignores.

        * @param anObserver The observer.

        *

        * @deprecated

        */

        IMPORT_C void RemoveObserver( MActiveApDbObserver* anObserver );

        /**

        * Returns the CCommsDatabase.

        * Required because we can not derive from CCommsDatabase...

        *

        * @deprecated

        */

        IMPORT_C CCommsDatabase*  Database();

    private:

        /**

        * Handle events from the database (DBMS).

        * The order of notification is the order of registration.

        * @param anEvent Event generated by DBMS. Values from

        * RDbNotifier::TEvent, or KErrCancel.

        */

        void HandleDbEventL( TInt anEvent );

        /**

        * Notify all observers about an event.

        * @param anEvent Event to be sent to observers.

        */

        void NotifyObserversL( MActiveApDbObserver::TEvent anEvent );

    friend class CActiveApDbNotifier;

    private:    // types

        /**

        * Default constructor. Can not leave.

        */

        CActiveApDb();

        enum TState             /// State of the finite state machine.

            {

            EClosed,            ///< Closed and idle.

            EReady,             ///< Open and ready for use.

            EWaitClose,         ///< Closed, waiting for other users to close.

            EWaitBackupRestore, ///< Closed, waiting Backup/Restore to finish.

            EWaitShutdown       ///< Closed, waiting to die.

            };

    private:        // Data

        CArrayPtrFlat<MActiveApDbObserver>* iObservers;   ///< Observers.

        CCommsDatabase*     iDb;    // Creates & owns it !

        // CommsDb has its own RDbNotifier...

        TState iState;  ///< Current state of the database.

        CActiveApDbNotifier*    iDbNotifier;

    };

#endif

// End of File