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#ifndef DatabaseTracker_h
#define DatabaseTracker_h
#include "modules/webdatabase/DatabaseError.h"
#include "wtf/HashMap.h"
#include "wtf/HashSet.h"
#include "wtf/ThreadingPrimitives.h"
#include "wtf/text/StringHash.h"
#include "wtf/text/WTFString.h"
namespace WebCore {
class DatabaseBackendBase;
class DatabaseContext;
class OriginLock;
class SecurityOrigin;
class DatabaseTracker {
WTF_MAKE_NONCOPYABLE(DatabaseTracker); WTF_MAKE_FAST_ALLOCATED;
public:
static DatabaseTracker& tracker();
// This singleton will potentially be used from multiple worker threads and the page's context thread simultaneously. To keep this safe, it's
// currently using 4 locks. In order to avoid deadlock when taking multiple locks, you must take them in the correct order:
// m_databaseGuard before quotaManager if both locks are needed.
// m_openDatabaseMapGuard before quotaManager if both locks are needed.
// m_databaseGuard and m_openDatabaseMapGuard currently don't overlap.
// notificationMutex() is currently independent of the other locks.
bool canEstablishDatabase(DatabaseContext*, const String& name, const String& displayName, unsigned long estimatedSize, DatabaseError&);
String fullPathForDatabase(SecurityOrigin*, const String& name, bool createIfDoesNotExist = true);
void addOpenDatabase(DatabaseBackendBase*);
void removeOpenDatabase(DatabaseBackendBase*);
unsigned long long getMaxSizeForDatabase(const DatabaseBackendBase*);
void interruptAllDatabasesForContext(const DatabaseContext*);
void closeDatabasesImmediately(const String& originIdentifier, const String& name);
void prepareToOpenDatabase(DatabaseBackendBase*);
void failedToOpenDatabase(DatabaseBackendBase*);
private:
typedef HashSet<DatabaseBackendBase*> DatabaseSet;
typedef HashMap<String, DatabaseSet*> DatabaseNameMap;
typedef HashMap<String, DatabaseNameMap*> DatabaseOriginMap;
class CloseOneDatabaseImmediatelyTask;
DatabaseTracker();
void closeOneDatabaseImmediately(const String& originIdentifier, const String& name, DatabaseBackendBase*);
Mutex m_openDatabaseMapGuard;
mutable OwnPtr<DatabaseOriginMap> m_openDatabaseMap;
};
} // namespace WebCore
#endif // DatabaseTracker_h