photosgallery/viewframework/medialists/inc/mglxcache.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 2008-2009 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:    Interface to media item cache
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*
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*/
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#ifndef M_GLXCACHE_H
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#define M_GLXCACHE_H
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class CGlxMedia;
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class MGlxCacheObserver;
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#include "glxmediaid.h"
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/**
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 *  MGlxCache
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 *
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 *  External interface to the media item cache
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 *
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 *  @lib glxmedialists.lib
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 */
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class MGlxCache
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	{
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public:	
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    /**
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     * Return a reference-counted instance of MGlxCache. User MUST Close() this when finished with it.
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     * @return Singleton cache object
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     */
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    IMPORT_C static MGlxCache* InstanceL();
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    /**
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     * Finds a media item based on id-space and media id
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     * @param aIdSpaceId The id space of the media item
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     * @param aMediaId The id of the media item
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     * @return The media item, if found; NULL if not
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     */
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	virtual CGlxMedia* Media(const TGlxIdSpaceId& aIdSpaceId, const TGlxMediaId& aMediaId) const = 0;
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    /**
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     * Add a cache observer
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     * @param aObserver The observer to add
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     */
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	virtual void AddObserverL(MGlxCacheObserver* aObserver) = 0;
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    /**
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     * Remove a cache observer
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     * @param aObserver The observer to remove
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     */
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	virtual void RemoveObserver(MGlxCacheObserver* aObserver) = 0;
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    /**
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     * Begin refreshing fetch contexts, if currently idle.
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     */
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    virtual void RefreshL() = 0;
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    /**
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     * Close the MGlxCache object. This MUST be called when the client has finished using it
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     */	
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	virtual void Close() = 0;
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	//OOM	
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	/**
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	 * ReleaseRAM on request
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	 */ 
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	 virtual void ReleaseRAML(TBool aFlushOnRequest = EFalse) = 0;
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	/**
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	 * Stop RAM realease.
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	 */ 
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	virtual void StopRAMReleaseL() = 0;	
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    //OOM
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	/**
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     * Cleanup Container Cache
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     */
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	virtual void ForceCleanupMedia(TGlxIdSpaceId aSpaceId,TGlxMediaId aId)=0;
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	};
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#endif // M_GLXCACHE_H
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