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/*
* Copyright (C) 2007 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 PageCache_h
#define PageCache_h
#include "HistoryItem.h"
#include "Timer.h"
#include <wtf/Forward.h>
#include <wtf/HashSet.h>
#include <wtf/Noncopyable.h>
namespace WebCore {
class CachedPage;
class HistoryItem;
class PageCache : Noncopyable {
public:
friend PageCache* pageCache();
void setCapacity(int); // number of pages to cache
int capacity() { return m_capacity; }
void add(PassRefPtr<HistoryItem>, PassRefPtr<CachedPage>); // Prunes if capacity() is exceeded.
void remove(HistoryItem*);
CachedPage* get(HistoryItem* item) { return item ? item->m_cachedPage.get() : 0; }
void releaseAutoreleasedPagesNow();
private:
typedef HashSet<RefPtr<CachedPage> > CachedPageSet;
PageCache(); // Use pageCache() instead.
~PageCache(); // Not implemented to make sure nobody accidentally calls delete -- WebCore does not delete singletons.
void addToLRUList(HistoryItem*); // Adds to the head of the list.
void removeFromLRUList(HistoryItem*);
void prune();
void autorelease(PassRefPtr<CachedPage>);
void releaseAutoreleasedPagesNowOrReschedule(Timer<PageCache>*);
int m_capacity;
int m_size;
// LRU List
HistoryItem* m_head;
HistoryItem* m_tail;
Timer<PageCache> m_autoreleaseTimer;
CachedPageSet m_autoreleaseSet;
};
// Function to obtain the global page cache.
PageCache* pageCache();
} // namespace WebCore
#endif // PageCache_h
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