1/* 2 * Copyright (C) 2010 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 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 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef IDBTransactionCoordinator_h 27#define IDBTransactionCoordinator_h 28 29#if ENABLE(INDEXED_DATABASE) 30 31#include <wtf/HashMap.h> 32#include <wtf/ListHashSet.h> 33#include <wtf/RefPtr.h> 34 35namespace WebCore { 36 37class IDBTransactionBackendImpl; 38class IDBDatabaseBackendImpl; 39 40// Transactions are executed in the order the were created. 41class IDBTransactionCoordinator { 42public: 43 static PassOwnPtr<IDBTransactionCoordinator> create(); 44 virtual ~IDBTransactionCoordinator(); 45 46 // Called by transactions as they start and finish. 47 void didCreateTransaction(IDBTransactionBackendImpl*); 48 void didStartTransaction(IDBTransactionBackendImpl*); 49 void didFinishTransaction(IDBTransactionBackendImpl*); 50 51#ifndef NDEBUG 52 bool isActive(IDBTransactionBackendImpl*); 53#endif 54 55private: 56 IDBTransactionCoordinator(); 57 58 void processStartedTransactions(); 59 bool canRunTransaction(IDBTransactionBackendImpl*); 60 61 // This is just an efficient way to keep references to all transactions. 62 HashMap<IDBTransactionBackendImpl*, RefPtr<IDBTransactionBackendImpl> > m_transactions; 63 // Transactions in different states are grouped below. 64 ListHashSet<IDBTransactionBackendImpl*> m_queuedTransactions; 65 HashSet<IDBTransactionBackendImpl*> m_startedTransactions; 66}; 67 68} // namespace WebCore 69 70#endif // ENABLE(INDEXED_DATABASE) 71 72#endif // IDBTransactionCoordinator_h 73