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
create()38 PassRefPtr<IDBTransactionCoordinator> IDBTransactionCoordinator::create()
39 {
40 return adoptRef(new IDBTransactionCoordinator());
41 }
42
IDBTransactionCoordinator()43 IDBTransactionCoordinator::IDBTransactionCoordinator()
44 {
45 }
46
~IDBTransactionCoordinator()47 IDBTransactionCoordinator::~IDBTransactionCoordinator()
48 {
49 }
50
didCreateTransaction(IDBTransactionBackendImpl * transaction)51 void IDBTransactionCoordinator::didCreateTransaction(IDBTransactionBackendImpl* transaction)
52 {
53 ASSERT(!m_transactions.contains(transaction));
54 m_transactions.add(transaction, transaction);
55 }
56
didStartTransaction(IDBTransactionBackendImpl * transaction)57 void IDBTransactionCoordinator::didStartTransaction(IDBTransactionBackendImpl* transaction)
58 {
59 ASSERT(m_transactions.contains(transaction));
60
61 m_startedTransactions.add(transaction);
62 processStartedTransactions();
63 }
64
didFinishTransaction(IDBTransactionBackendImpl * transaction)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.
isActive(IDBTransactionBackendImpl * transaction)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
processStartedTransactions()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