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      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 "modules/webdatabase/DatabaseDetails.h"
     33 #include "wtf/Assertions.h"
     34 #include "wtf/ThreadSafeRefCounted.h"
     35 
     36 namespace WebCore {
     37 
     38 class Database;
     39 class DatabaseBackendContext;
     40 class DatabaseTaskSynchronizer;
     41 class DatabaseThread;
     42 class ScriptExecutionContext;
     43 
     44 class DatabaseContext : public ThreadSafeRefCounted<DatabaseContext>, public ActiveDOMObject {
     45 public:
     46     virtual ~DatabaseContext();
     47 
     48     // For life-cycle management (inherited from ActiveDOMObject):
     49     virtual void contextDestroyed();
     50     virtual void stop();
     51 
     52     PassRefPtr<DatabaseBackendContext> backend();
     53     DatabaseThread* databaseThread();
     54 
     55     void setHasOpenDatabases() { m_hasOpenDatabases = true; }
     56     bool hasOpenDatabases() { return m_hasOpenDatabases; }
     57 
     58     // When the database cleanup is done, cleanupSync will be signalled.
     59     bool stopDatabases(DatabaseTaskSynchronizer*);
     60 
     61     bool allowDatabaseAccess() const;
     62 
     63 private:
     64     explicit DatabaseContext(ScriptExecutionContext*);
     65 
     66     void stopDatabases() { stopDatabases(0); }
     67 
     68     RefPtr<DatabaseThread> m_databaseThread;
     69     bool m_hasOpenDatabases; // This never changes back to false, even after the database thread is closed.
     70     bool m_isRegistered;
     71     bool m_hasRequestedTermination;
     72 
     73     friend class DatabaseBackendContext;
     74     friend class DatabaseManager;
     75 };
     76 
     77 } // namespace WebCore
     78 
     79 #endif // DatabaseContext_h
     80