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webengine/osswebengine/WebCore/platform/symbian/OOMHandler.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 26 Oct 2009 08:28:45 +0200
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/*
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* ==============================================================================
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*  Name        : OOMHandler.h
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*  Part of     : Webcore / Platform
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*  Interface   :
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*  Description :
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*  Version     : %Version%
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*
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*    Copyright (c) 2006, Nokia Corporation
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*    All rights reserved.
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*
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*   Redistribution and use in source and binary forms, with or without
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*   modification, are permitted provided that the following conditions
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*   are met:
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*
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*      * Redistributions of source code must retain the above copyright
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*        notice, this list of conditions and the following disclaimer.
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*      * Redistributions in binary form must reproduce the above copyright
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*        notice, this list of conditions and the following disclaimer in
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*        the documentation and/or other materials provided with the
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*        distribution.
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*      * Neither the name of the Nokia Corporation nor the names of its
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*        contributors may be used to endorse or promote products derived
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*        from this software without specific prior written permission.
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*
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*   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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*   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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*   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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*   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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*   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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*   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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*   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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*   USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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*   DAMAGE.
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*
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*
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* ==============================================================================
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*/
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#ifndef __OOMHANDLER_H__













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#define __OOMHANDLER_H__













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#include <e32def.h>













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#include "MemoryManager.h"













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namespace WebCore {













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/*













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 * This handles collecting memory when OOM occurs, by clearing the cache.













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 * The StopScheduler has two collection modes, low and middle priority.













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 * When memory is at a certain threshold, all collectors low and above are called.













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 * When memory is at a critical threshold, all collectors middle and above are called.













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 * We want the cache to always clear whenever OOM happens so this collector's













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 * priority is high.













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 */













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class OOMHandler : public MMemoryCollector








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{













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public:













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    OOMHandler();













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    virtual ~OOMHandler();













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    // from collector













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    TUint Collect(TUint aRequired);













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    void Restore();













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    TOOMPriority Priority()     { return EOOM_PriorityHigh; }













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};













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}













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#endif // END OF FILE















MCL/sf/mw/web