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

#ifndef __OOMHANDLER_H__
#define __OOMHANDLER_H__

#include <e32def.h>
#include <MemoryManager.h>

namespace WebCore {

/*
 * This handles collecting memory when OOM occurs, by clearing the cache.
 * The StopScheduler has two collection modes, low and middle priority.
 * When memory is at a certain threshold, all collectors low and above are called.
 * When memory is at a critical threshold, all collectors middle and above are called.
 * We want the cache to always clear whenever OOM happens so this collector's
 * priority is high.
 */
class OOMHandler : public MMemoryCollector
{
public:
    OOMHandler();
    virtual ~OOMHandler();

    // from collector
    TUint Collect(TUint aRequired);
    void Restore();

    TOOMPriority Priority()     { return EOOM_PriorityHigh; }
};

}

#endif // END OF FILE
