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/*
* Copyright (C) 2008 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 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 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 ApplicationCacheStorage_h
#define ApplicationCacheStorage_h
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
#include "PlatformString.h"
#include "SQLiteDatabase.h"
#include "StringHash.h"
#include <wtf/HashCountedSet.h>
namespace WebCore {
class ApplicationCache;
class ApplicationCacheHost;
class ApplicationCacheGroup;
class ApplicationCacheResource;
class KURL;
template <class T>
class StorageIDJournal;
class ApplicationCacheStorage : public Noncopyable {
public:
void setCacheDirectory(const String&);
const String& cacheDirectory() const;
void setMaximumSize(int64_t size);
int64_t maximumSize() const;
bool isMaximumSizeReached() const;
int64_t spaceNeeded(int64_t cacheToSave);
ApplicationCacheGroup* cacheGroupForURL(const KURL&); // Cache to load a main resource from.
ApplicationCacheGroup* fallbackCacheGroupForURL(const KURL&); // Cache that has a fallback entry to load a main resource from if normal loading fails.
ApplicationCacheGroup* findOrCreateCacheGroup(const KURL& manifestURL);
void cacheGroupDestroyed(ApplicationCacheGroup*);
void cacheGroupMadeObsolete(ApplicationCacheGroup*);
bool storeNewestCache(ApplicationCacheGroup*); // Updates the cache group, but doesn't remove old cache.
bool store(ApplicationCacheResource*, ApplicationCache*);
bool storeUpdatedType(ApplicationCacheResource*, ApplicationCache*);
// Removes the group if the cache to be removed is the newest one (so, storeNewestCache() needs to be called beforehand when updating).
void remove(ApplicationCache*);
void empty();
static bool storeCopyOfCache(const String& cacheDirectory, ApplicationCacheHost*);
bool manifestURLs(Vector<KURL>* urls);
bool cacheGroupSize(const String& manifestURL, int64_t* size);
bool deleteCacheGroup(const String& manifestURL);
void vacuumDatabaseFile();
private:
ApplicationCacheStorage();
PassRefPtr<ApplicationCache> loadCache(unsigned storageID);
ApplicationCacheGroup* loadCacheGroup(const KURL& manifestURL);
typedef StorageIDJournal<ApplicationCacheResource> ResourceStorageIDJournal;
typedef StorageIDJournal<ApplicationCacheGroup> GroupStorageIDJournal;
bool store(ApplicationCacheGroup*, GroupStorageIDJournal*);
bool store(ApplicationCache*, ResourceStorageIDJournal*);
bool store(ApplicationCacheResource*, unsigned cacheStorageID);
void loadManifestHostHashes();
void verifySchemaVersion();
void openDatabase(bool createIfDoesNotExist);
bool executeStatement(SQLiteStatement&);
bool executeSQLCommand(const String&);
void checkForMaxSizeReached();
String m_cacheDirectory;
String m_cacheFile;
int64_t m_maximumSize;
bool m_isMaximumSizeReached;
SQLiteDatabase m_database;
// In order to quickly determine if a given resource exists in an application cache,
// we keep a hash set of the hosts of the manifest URLs of all non-obsolete cache groups.
HashCountedSet<unsigned, AlreadyHashed> m_cacheHostSet;
typedef HashMap<String, ApplicationCacheGroup*> CacheGroupMap;
CacheGroupMap m_cachesInMemory; // Excludes obsolete cache groups.
friend ApplicationCacheStorage& cacheStorage();
};
ApplicationCacheStorage& cacheStorage();
} // namespace WebCore
#endif // ENABLE(OFFLINE_WEB_APPLICATIONS)
#endif // ApplicationCacheStorage_h
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