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      1 /*
      2  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      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  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 #ifndef DatabaseThread_h
     29 #define DatabaseThread_h
     30 
     31 #include "platform/WebThreadSupportingGC.h"
     32 #include "platform/heap/Handle.h"
     33 #include "wtf/Deque.h"
     34 #include "wtf/HashMap.h"
     35 #include "wtf/HashSet.h"
     36 #include "wtf/OwnPtr.h"
     37 #include "wtf/PassOwnPtr.h"
     38 #include "wtf/PassRefPtr.h"
     39 #include "wtf/RefPtr.h"
     40 #include "wtf/ThreadSafeRefCounted.h"
     41 #include "wtf/ThreadingPrimitives.h"
     42 
     43 namespace blink {
     44 
     45 class Database;
     46 class DatabaseTask;
     47 class Document;
     48 class MessageLoopInterruptor;
     49 class PendingGCRunner;
     50 class SQLTransactionClient;
     51 class SQLTransactionCoordinator;
     52 class TaskSynchronizer;
     53 
     54 class DatabaseThread : public ThreadSafeRefCountedWillBeGarbageCollectedFinalized<DatabaseThread> {
     55 public:
     56     static PassRefPtrWillBeRawPtr<DatabaseThread> create() { return adoptRefWillBeNoop(new DatabaseThread); }
     57     ~DatabaseThread();
     58     void trace(Visitor*);
     59 
     60     void start();
     61     void terminate();
     62     bool terminationRequested() const;
     63 
     64     void scheduleTask(PassOwnPtr<DatabaseTask>);
     65 
     66     void recordDatabaseOpen(Database*);
     67     void recordDatabaseClosed(Database*);
     68     bool isDatabaseOpen(Database*);
     69 
     70     bool isDatabaseThread() { return m_thread && m_thread->isCurrentThread(); }
     71 
     72     SQLTransactionClient* transactionClient() { return m_transactionClient.get(); }
     73     SQLTransactionCoordinator* transactionCoordinator() { return m_transactionCoordinator.get(); }
     74 
     75 private:
     76     DatabaseThread();
     77 
     78     void setupDatabaseThread();
     79     void cleanupDatabaseThread();
     80     void cleanupDatabaseThreadCompleted();
     81 
     82     OwnPtr<WebThreadSupportingGC> m_thread;
     83 
     84     // This set keeps track of the open databases that have been used on this thread.
     85     // This must be updated in the database thread though it is constructed and
     86     // destructed in the context thread.
     87     WillBeHeapHashSet<RefPtrWillBeMember<Database> > m_openDatabaseSet;
     88 
     89     OwnPtr<SQLTransactionClient> m_transactionClient;
     90     OwnPtrWillBeMember<SQLTransactionCoordinator> m_transactionCoordinator;
     91     TaskSynchronizer* m_cleanupSync;
     92 
     93     mutable Mutex m_terminationRequestedMutex;
     94     bool m_terminationRequested;
     95 };
     96 
     97 } // namespace blink
     98 
     99 #endif // DatabaseThread_h
    100