Home | History | Annotate | Download | only in webdatabase 
      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