1 /* 2 * Copyright (C) 2007 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef PageCache_h 27 #define PageCache_h 28 29 #include "HistoryItem.h" 30 #include "Timer.h" 31 #include <wtf/Forward.h> 32 #include <wtf/HashSet.h> 33 #include <wtf/Noncopyable.h> 34 35 namespace WebCore { 36 37 class CachedPage; 38 class HistoryItem; 39 40 class PageCache : public Noncopyable { 41 public: 42 friend PageCache* pageCache(); 43 44 void setCapacity(int); // number of pages to cache capacity()45 int capacity() { return m_capacity; } 46 47 void add(PassRefPtr<HistoryItem>, PassRefPtr<CachedPage>); // Prunes if capacity() is exceeded. 48 void remove(HistoryItem*); get(HistoryItem * item)49 CachedPage* get(HistoryItem* item) { return item ? item->m_cachedPage.get() : 0; } 50 51 void releaseAutoreleasedPagesNow(); 52 pageCount()53 int pageCount() const { return m_size; } 54 int frameCount() const; 55 int autoreleasedPageCount() const; 56 57 private: 58 typedef HashSet<RefPtr<CachedPage> > CachedPageSet; 59 60 PageCache(); // Use pageCache() instead. 61 ~PageCache(); // Not implemented to make sure nobody accidentally calls delete -- WebCore does not delete singletons. 62 63 void addToLRUList(HistoryItem*); // Adds to the head of the list. 64 void removeFromLRUList(HistoryItem*); 65 66 void prune(); 67 68 void autorelease(PassRefPtr<CachedPage>); 69 void releaseAutoreleasedPagesNowOrReschedule(Timer<PageCache>*); 70 71 int m_capacity; 72 int m_size; 73 74 // LRU List 75 HistoryItem* m_head; 76 HistoryItem* m_tail; 77 78 Timer<PageCache> m_autoreleaseTimer; 79 CachedPageSet m_autoreleaseSet; 80 }; 81 82 // Function to obtain the global page cache. 83 PageCache* pageCache(); 84 85 } // namespace WebCore 86 87 #endif // PageCache_h 88