metadataengine/server/inc/mdsgarbagecollector.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 26 Jan 2010 12:13:20 +0200
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/*
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* Copyright (c) 2002-2009 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:  This is garbage colletion class which sends*
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*/
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#ifndef _MDSGARBAGECOLLECTOR_H_
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#define _MDSGARBAGECOLLECTOR_H_
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#include <e32std.h>
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#include <e32base.h>
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class MMdSGarbageCollectorObserver
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	{
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	public:
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		/*
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		 * @return if the garbage collection need to be started again
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		 */
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		virtual TBool StartGarbageCollectionL() = 0;
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	};
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class CMdSGarbageCollector : public CActive
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{
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public:
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	virtual ~CMdSGarbageCollector();
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	/**
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	 * Two phase constructor.
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	 * @param aObserver an observer which will be notified when the garbage collector starts.
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	 * @return an instance of CMdSGarbageCollector
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	 */
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	static CMdSGarbageCollector* NewL(MMdSGarbageCollectorObserver& aObserver);
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	/**
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	 * Two phase constructor.
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	 * @param aObserver an observer which will be notified when the garbage collector starts.
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 	 * @return an instance of CMdSGarbageCollector
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	 */
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	static CMdSGarbageCollector* NewLC(MMdSGarbageCollectorObserver& aObserver);
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	/**
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	 * Starts garbage connection with a delay. The same value will also be used as interval between
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	 * following garbage collections if the observer returns ETrue when StartGarbageCollectionL()
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	 * is called.
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	 * 
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	 * @param aDelay delay before garbage collection starts
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	 */
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	void Start( TInt aDelay );
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	/**
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	 * Pauses garbage collection.
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	 */
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	void Pause();
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	/**
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	 * Resumes garbage collection.
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	 */
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	void Resume();
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private:
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	CMdSGarbageCollector(MMdSGarbageCollectorObserver& aObserver);
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	void ConstructL();
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	virtual void RunL();
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	virtual void DoCancel();
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	virtual TInt RunError( TInt aError );
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private:
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	RTimer iTimer;
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	TTimeIntervalMicroSeconds32 iDelay;
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	TTimeIntervalMicroSeconds32 iNewDelay;
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	MMdSGarbageCollectorObserver& iObserver;
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};
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#endif