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