/*

* Copyright (c) 2006 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:  Plugin monitor

*

*/

#ifndef CMPXPLUGINMONITOR_H

#define CMPXPLUGINMONITOR_H

#include <ecom/ecom.h>

#include <badesca.h>

#include <mpxpluginmonitorobserver.h>

/**

*  Monitors a designated plugin interface. When a plugin for that interface is

*  added or removed, if a client is interested in the event, client will be

*  notified through MMPXPluginMonitorObserver interface.

*

*  @lib mpxcommon.lib

*/

class CMPXPluginMonitor : public CActive

    {

public:

    /**

    *  Two-phased constructor.

    *

    *  @since S60 3.2.3

    *  @param aInterfaceUid The UID of the plugin interface to be monitored by

    *                       this instance of CMPXPluginMonitor

    *  @return Constructed object

    */

    IMPORT_C static CMPXPluginMonitor* NewL(const TUid& aInterfaceUid);

    /**

    *  Destructor.

    *

    *  @since S60 3.2.3

    */

    IMPORT_C ~CMPXPluginMonitor();

    /**

    *  Add a observer.

    *

    *  @since S60 3.2.3

    *  @param aObs observer to be added

    */

    void AddObserverL(MMPXPluginMonitorObserver& aObs);

    /**

    *  Remove a observer.

    *

    *  @since S60 3.2.3

    *  @param aObs observer to be removed

    */

    void RemoveObserverL(MMPXPluginMonitorObserver& aObs);

    /**

    *  Request to notify all observers that they should unload a specified plugin

    *  because it is being updated.

    *

    *  @since S60 3.2.3

    *  @param aPluginUid plugin that is being updated

    */

    void NotifyUnload(const TUid& aPluginUid);

private:

    /**

    *  2nd phase contructor.

    *

    *  @since S60 3.2.3

    */

    void ConstructL();

    /**

    *  C++ constructor.

    *

    *  @since S60 3.2.3

    *  @param aInterfaceUid The UID of the plugin interface to be monitored by

    *                       this instance of CMPXPluginMonitor

    */

    CMPXPluginMonitor(const TUid& aInterfaceUid);

    /**

    *  From CActive.

    *  Handles an active object's request completion event.

    *

    *  @since S60 3.2.3

    */

    void RunL();

    /**

    *  From CActive.

    *  Handles a leave occurring in the request completion event handler RunL().

    *

    *  @since S60 3.2.3

    *  @param aError error code

    *  @return system error code

    */

    TInt RunError(TInt aError);

    /**

    * From CActive.

    * Implements cancellation of an outstanding request.

    *

    * @since S60 3.2.3

    */

    void DoCancel();

private:

    TUid iInterfaceUid;

    RPointerArray<MMPXPluginMonitorObserver> iObservers;  // items not owned

    REComSession iECs;

    };

#endif // CMPXPLUGINMONITOR_H