mmappcomponents/harvester/server/inc/mpxmediaremovalmonitor.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 14 May 2010 16:21:14 +0300
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/*
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* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Monitors for media removal events
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*
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*/
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#ifndef CMPXMEDIAREMOVALMONITOR_H
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#define CMPXMEDIAREMOVALMONITOR_H
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#include <e32base.h>
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#include <disknotifyhandler.h>
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#include "mpxsystemeventobserver.h"
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/**
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 *  Class to monitors for File System dismount events
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 * 
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 *  The monitor emits events to MMPXSystemEventObserver
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 * 
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 *     EDiskDismountEvent whenever a drive is about to be dismounted (see RFs::NotifyDismount).
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 *     EDiskRemovedEvent  whenever a specified drive has been dismounted or removed
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 *     EDiskInsertedEvent whenever a specified drive has been inserted
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 *
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 *  The observer is expected to prepare the drive for dismounting during the EDiskDismountEvent.
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 *
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 *  Dismount monitoring is automatically subscribed for all non-remote drives.
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 *  Inserted/Removed monitor is subscribed only for the drive given in the constructor.
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 *
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 *  @lib Harvester
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 *  @since S60 3.0
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 */
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class CMPXMediaRemovalMonitor : public CBase, 
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                                public MDiskNotifyHandlerCallback
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    {
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public:
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    /**
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    * Two-phase constructor
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    * @param aDrive drive to monitor for insertions and removals
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    * @param aFs file server session
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    * @param aObserver observer to the event
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    */
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    static CMPXMediaRemovalMonitor* NewL( TInt aDrive, 
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                                          RFs& aFs,
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                                          MMPXSystemEventObserver& aObserver );
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    /**
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    * Two-phase constructor
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    * @param aDrive drive to monitor
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    * @param aFs file server session
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    * @param aObserver observer to the event
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    */
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    static CMPXMediaRemovalMonitor* NewLC( TInt aDrive, 
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                                           RFs& aFs,
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                                           MMPXSystemEventObserver& aObserver );
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    /**
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    * Virtual destructor
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    */
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    virtual ~CMPXMediaRemovalMonitor();
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    /**
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    * Check the status of the monitored disks
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    *
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    * This check should be done whenever there is a risk that we got
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    * a NotifyDismount even though the drives actually weren't dismounted.
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    * 
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    */
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    void CheckDriveStatus();
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protected: // From Base Class
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    /**
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    * From MDiskNotifyHandlerCallback
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    */
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    void HandleNotifyDismount( TInt aError, const TDismountEvent& aEvent );
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    void HandleNotifyDisk( TInt aError, const TDiskEvent& aEvent );
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private:
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    /**
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    *  C++ constructor
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    * @param aDrive drive to monitor
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    * @param aFs file server session
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    * @param aObserver observer to the event
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    */
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    CMPXMediaRemovalMonitor( TInt aDrive,
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                             RFs& aFs,  
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                             MMPXSystemEventObserver& aObserver );
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    void ConstructL();
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private: // data
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    CDiskNotifyHandler*  iDiskNotifyHandler;  // Disk notification handler
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    TInt iDrive;        // Drive that is being monitored
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    RFs& iFs;           // File Session, not owned
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    TBool iDiskRemoved; // Is the disk inserted
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    /*
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    * Observer interface to callback to an observer
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    */
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    MMPXSystemEventObserver& iObserver;
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    };
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#endif // CMPXMEDIAREMOVALMONITOR_H