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: SQLTransactionCoordinator()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