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      1 /*
      2  * Copyright (C) 2009 Google Inc. All rights reserved.
      3  * Copyright (C) 2013 Apple 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 are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef SQLTransactionCoordinator_h
     33 #define SQLTransactionCoordinator_h
     34 
     35 #include "platform/heap/Handle.h"
     36 #include "wtf/Deque.h"
     37 #include "wtf/HashMap.h"
     38 #include "wtf/HashSet.h"
     39 #include "wtf/RefPtr.h"
     40 #include "wtf/text/StringHash.h"
     41 
     42 namespace WebCore {
     43 
     44 class SQLTransactionBackend;
     45 
     46 class SQLTransactionCoordinator : public NoBaseWillBeGarbageCollected<SQLTransactionCoordinator> {
     47     WTF_MAKE_NONCOPYABLE(SQLTransactionCoordinator);
     48     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     49 public:
     50     SQLTransactionCoordinator();
     51     void trace(Visitor*);
     52     void acquireLock(SQLTransactionBackend*);
     53     void releaseLock(SQLTransactionBackend*);
     54     void shutdown();
     55 private:
     56     typedef Deque<RefPtrWillBeMember<SQLTransactionBackend> > TransactionsQueue;
     57     struct CoordinationInfo {
     58         TransactionsQueue pendingTransactions;
     59         WillBeHeapHashSet<RefPtrWillBeMember<SQLTransactionBackend> > activeReadTransactions;
     60         RefPtrWillBeMember<SQLTransactionBackend> activeWriteTransaction;
     61 
     62         void trace(Visitor* visitor)
     63         {
     64             visitor->trace(pendingTransactions);
     65             visitor->trace(activeReadTransactions);
     66             visitor->trace(activeWriteTransaction);
     67         }
     68         ALLOW_ONLY_INLINE_ALLOCATION();
     69     };
     70     // Maps database names to information about pending transactions
     71     typedef WillBeHeapHashMap<String, CoordinationInfo> CoordinationInfoHeapMap;
     72     CoordinationInfoHeapMap m_coordinationInfoMap;
     73     bool m_isShuttingDown;
     74 
     75     void processPendingTransactions(CoordinationInfo&);
     76 };
     77 
     78 } // namespace WebCore
     79 
     80 #endif // SQLTransactionCoordinator_h
     81