/* | |
* 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 : public 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(); | |
int pageCount() const { return m_size; } | |
int frameCount() const; | |
int autoreleasedPageCount() const; | |
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 |