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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 "CString.h"
     37 #include "StringHash.h"
     38 #include <wtf/Deque.h>
     39 #include <wtf/HashMap.h>
     40 #include <wtf/HashSet.h>
     41 #include <wtf/RefPtr.h>
     42 
     43 namespace WebCore {
     44 
     45     class SQLTransaction;
     46 
     47     class SQLTransactionCoordinator : public Noncopyable {
     48     public:
     49         void acquireLock(SQLTransaction*);
     50         void releaseLock(SQLTransaction*);
     51         void shutdown();
     52     private:
     53         typedef Deque<RefPtr<SQLTransaction> > TransactionsQueue;
     54         struct CoordinationInfo {
     55             TransactionsQueue pendingTransactions;
     56             HashSet<RefPtr<SQLTransaction> > activeReadTransactions;
     57             RefPtr<SQLTransaction> activeWriteTransaction;
     58         };
     59         // Maps database names to information about pending transactions
     60         typedef HashMap<String, CoordinationInfo> CoordinationInfoMap;
     61         CoordinationInfoMap m_coordinationInfoMap;
     62 
     63         void processPendingTransactions(CoordinationInfo& info);
     64     };
     65 }
     66 
     67 #endif // ENABLE(DATABASE)
     68 
     69 #endif // SQLTransactionCoordinator_h
     70