1 /* 2 * Copyright (C) 2008 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 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 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 LocalStorageArea_h 27 #define LocalStorageArea_h 28 29 #include "LocalStorageTask.h" 30 #include "LocalStorageThread.h" 31 32 #include "SQLiteDatabase.h" 33 #include "StorageArea.h" 34 #include "StringHash.h" 35 #include "Timer.h" 36 37 #include <wtf/HashMap.h> 38 #include <wtf/PassRefPtr.h> 39 #include <wtf/Threading.h> 40 41 namespace WebCore { 42 43 class LocalStorage; 44 45 class LocalStorageArea : public StorageArea { 46 public: 47 virtual ~LocalStorageArea(); 48 create(SecurityOrigin * origin,LocalStorage * localStorage)49 static PassRefPtr<LocalStorageArea> create(SecurityOrigin* origin, LocalStorage* localStorage) { return adoptRef(new LocalStorageArea(origin, localStorage)); } 50 51 void scheduleFinalSync(); 52 53 private: 54 LocalStorageArea(SecurityOrigin*, LocalStorage*); 55 56 virtual void itemChanged(const String& key, const String& oldValue, const String& newValue, Frame* sourceFrame); 57 virtual void itemRemoved(const String& key, const String& oldValue, Frame* sourceFrame); 58 virtual void areaCleared(Frame* sourceFrame); 59 60 void scheduleItemForSync(const String& key, const String& value); 61 void scheduleClear(); 62 void dispatchStorageEvent(const String& key, const String& oldValue, const String& newValue, Frame* sourceFrame); 63 64 Timer<LocalStorageArea> m_syncTimer; 65 HashMap<String, String> m_changedItems; 66 bool m_itemsCleared; 67 68 bool m_finalSyncScheduled; 69 70 LocalStorage* m_localStorage; 71 72 // The database handle will only ever be opened and used on the background thread. 73 SQLiteDatabase m_database; 74 75 // The following members are subject to thread synchronization issues. 76 public: 77 // Called on the main thread 78 virtual unsigned length() const; 79 virtual String key(unsigned index, ExceptionCode&) const; 80 virtual String getItem(const String&) const; 81 virtual void setItem(const String& key, const String& value, ExceptionCode&, Frame* sourceFrame); 82 virtual void removeItem(const String&, Frame* sourceFrame); 83 virtual bool contains(const String& key) const; 84 85 // Called from the background thread 86 virtual void performImport(); 87 virtual void performSync(); 88 89 private: 90 void syncTimerFired(Timer<LocalStorageArea>*); 91 92 Mutex m_syncLock; 93 HashMap<String, String> m_itemsPendingSync; 94 bool m_clearItemsWhileSyncing; 95 bool m_syncScheduled; 96 97 mutable Mutex m_importLock; 98 mutable ThreadCondition m_importCondition; 99 mutable bool m_importComplete; 100 void markImported(); 101 }; 102 103 } // namespace WebCore 104 105 #endif // LocalStorageArea_h 106