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29 #ifndef DatabaseTracker_h
30 #define DatabaseTracker_h
32 #include "modules/webdatabase/DatabaseError.h"
33 #include "wtf/HashMap.h"
34 #include "wtf/HashSet.h"
35 #include "wtf/ThreadingPrimitives.h"
36 #include "wtf/text/StringHash.h"
37 #include "wtf/text/WTFString.h"
41 class DatabaseBackendBase;
42 class DatabaseContext;
46 class DatabaseTracker {
47 WTF_MAKE_NONCOPYABLE(DatabaseTracker); WTF_MAKE_FAST_ALLOCATED;
49 static DatabaseTracker& tracker();
50 // This singleton will potentially be used from multiple worker threads and the page's context thread simultaneously. To keep this safe, it's
51 // currently using 4 locks. In order to avoid deadlock when taking multiple locks, you must take them in the correct order:
52 // m_databaseGuard before quotaManager if both locks are needed.
53 // m_openDatabaseMapGuard before quotaManager if both locks are needed.
54 // m_databaseGuard and m_openDatabaseMapGuard currently don't overlap.
55 // notificationMutex() is currently independent of the other locks.
57 bool canEstablishDatabase(DatabaseContext*, const String& name, const String& displayName, unsigned long estimatedSize, DatabaseError&);
58 String fullPathForDatabase(SecurityOrigin*, const String& name, bool createIfDoesNotExist = true);
60 void addOpenDatabase(DatabaseBackendBase*);
61 void removeOpenDatabase(DatabaseBackendBase*);
63 unsigned long long getMaxSizeForDatabase(const DatabaseBackendBase*);
65 void interruptAllDatabasesForContext(const DatabaseContext*);
66 void closeDatabasesImmediately(const String& originIdentifier, const String& name);
68 void prepareToOpenDatabase(DatabaseBackendBase*);
69 void failedToOpenDatabase(DatabaseBackendBase*);
72 typedef HashSet<DatabaseBackendBase*> DatabaseSet;
73 typedef HashMap<String, DatabaseSet*> DatabaseNameMap;
74 typedef HashMap<String, DatabaseNameMap*> DatabaseOriginMap;
75 class CloseOneDatabaseImmediatelyTask;
79 void closeOneDatabaseImmediately(const String& originIdentifier, const String& name, DatabaseBackendBase*);
81 Mutex m_openDatabaseMapGuard;
82 mutable OwnPtr<DatabaseOriginMap> m_openDatabaseMap;
87 #endif // DatabaseTracker_h