1 /* 2 * Copyright (C) 2008 Apple Inc. All Rights Reserved. 3 * Copyright (C) 2011 Google, Inc. All Rights Reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 */ 27 28 #ifndef DatabaseContext_h 29 #define DatabaseContext_h 30 31 #include "core/dom/ActiveDOMObject.h" 32 #include "core/workers/WorkerGlobalScope.h" 33 #include "platform/heap/Handle.h" 34 #include "wtf/PassRefPtr.h" 35 #include "wtf/ThreadSafeRefCounted.h" 36 37 namespace WebCore { 38 39 class Database; 40 class DatabaseBackendBase; 41 class DatabaseContext; 42 class TaskSynchronizer; 43 class DatabaseThread; 44 class ExecutionContext; 45 class SecurityOrigin; 46 47 class DatabaseContext FINAL 48 : public ThreadSafeRefCountedWillBeGarbageCollectedFinalized<DatabaseContext> 49 , public ActiveDOMObject 50 , private WorkerGlobalScope::TerminationObserver { 51 public: 52 friend class DatabaseManager; 53 54 static PassRefPtrWillBeRawPtr<DatabaseContext> create(ExecutionContext*); 55 56 virtual ~DatabaseContext(); 57 void trace(Visitor*); 58 59 // For life-cycle management (inherited from ActiveDOMObject): 60 virtual void contextDestroyed() OVERRIDE; 61 virtual void stop() OVERRIDE; 62 63 DatabaseContext* backend(); 64 DatabaseThread* databaseThread(); 65 66 void setHasOpenDatabases() { m_hasOpenDatabases = true; } 67 void didOpenDatabase(DatabaseBackendBase&); 68 void didCloseDatabase(DatabaseBackendBase&); 69 // Blocks the caller thread until cleanup tasks are completed. 70 void stopDatabases(); 71 72 bool allowDatabaseAccess() const; 73 74 SecurityOrigin* securityOrigin() const; 75 bool isContextThread() const; 76 77 private: 78 explicit DatabaseContext(ExecutionContext*); 79 80 virtual void wasRequestedToTerminate() OVERRIDE; 81 void stopSyncDatabases(); 82 83 RefPtrWillBeMember<DatabaseThread> m_databaseThread; 84 #if ENABLE(OILPAN) 85 class DatabaseCloser { 86 public: 87 explicit DatabaseCloser(DatabaseBackendBase& database) : m_database(database) { } 88 ~DatabaseCloser(); 89 90 private: 91 DatabaseBackendBase& m_database; 92 }; 93 HeapHashMap<WeakMember<DatabaseBackendBase>, OwnPtr<DatabaseCloser> > m_openSyncDatabases; 94 #else 95 // The contents of m_openSyncDatabases are raw pointers. It's safe because 96 // DatabaseBackendSync is always closed before destruction. 97 HashSet<DatabaseBackendBase*> m_openSyncDatabases; 98 #endif 99 bool m_hasOpenDatabases; // This never changes back to false, even after the database thread is closed. 100 bool m_hasRequestedTermination; 101 }; 102 103 } // namespace WebCore 104 105 #endif // DatabaseContext_h 106