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 #include "config.h" 27 #include "IDBTransactionCoordinator.h" 28 29 #if ENABLE(INDEXED_DATABASE) 30 31 #include "IDBDatabaseBackendImpl.h" 32 #include "IDBObjectStoreBackendInterface.h" 33 #include "IDBTransactionBackendImpl.h" 34 #include "ScriptExecutionContext.h" 35 36 namespace WebCore { 37 38 PassRefPtr<IDBTransactionCoordinator> IDBTransactionCoordinator::create() 39 { 40 return adoptRef(new IDBTransactionCoordinator()); 41 } 42 43 IDBTransactionCoordinator::IDBTransactionCoordinator() 44 { 45 } 46 47 IDBTransactionCoordinator::~IDBTransactionCoordinator() 48 { 49 } 50 51 void IDBTransactionCoordinator::didCreateTransaction(IDBTransactionBackendImpl* transaction) 52 { 53 ASSERT(!m_transactions.contains(transaction)); 54 m_transactions.add(transaction, transaction); 55 } 56 57 void IDBTransactionCoordinator::didStartTransaction(IDBTransactionBackendImpl* transaction) 58 { 59 ASSERT(m_transactions.contains(transaction)); 60 61 m_startedTransactions.add(transaction); 62 processStartedTransactions(); 63 } 64 65 void IDBTransactionCoordinator::didFinishTransaction(IDBTransactionBackendImpl* transaction) 66 { 67 ASSERT(m_transactions.contains(transaction)); 68 69 if (m_startedTransactions.contains(transaction)) { 70 ASSERT(!m_runningTransactions.contains(transaction)); 71 m_startedTransactions.remove(transaction); 72 } else if (m_runningTransactions.contains(transaction)) 73 m_runningTransactions.remove(transaction); 74 75 m_transactions.remove(transaction); 76 77 processStartedTransactions(); 78 } 79 80 #ifndef NDEBUG 81 // Verifies internal consistiency while returning whether anything is found. 82 bool IDBTransactionCoordinator::isActive(IDBTransactionBackendImpl* transaction) 83 { 84 bool found = false; 85 if (m_startedTransactions.contains(transaction)) 86 found = true; 87 if (m_runningTransactions.contains(transaction)) { 88 ASSERT(!found); 89 found = true; 90 } 91 ASSERT(found == m_transactions.contains(transaction)); 92 return found; 93 } 94 #endif 95 96 void IDBTransactionCoordinator::processStartedTransactions() 97 { 98 // FIXME: For now, we only allow one transaction to run at a time. 99 if (!m_runningTransactions.isEmpty()) 100 return; 101 102 if (m_startedTransactions.isEmpty()) 103 return; 104 105 IDBTransactionBackendImpl* transaction = *m_startedTransactions.begin(); 106 m_startedTransactions.remove(transaction); 107 m_runningTransactions.add(transaction); 108 transaction->run(); 109 } 110 111 }; 112 113 #endif // ENABLE(INDEXED_DATABASE) 114