1/*
2 * Copyright (C) 2009 Google Inc. All rights reserved.
3 * Copyright (C) 2013 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef SQLTransactionCoordinator_h
33#define SQLTransactionCoordinator_h
34
35#if ENABLE(SQL_DATABASE)
36
37#include <wtf/Deque.h>
38#include <wtf/HashMap.h>
39#include <wtf/HashSet.h>
40#include <wtf/RefPtr.h>
41#include <wtf/text/StringHash.h>
42
43namespace WebCore {
44
45class SQLTransactionBackend;
46
47class SQLTransactionCoordinator {
48    WTF_MAKE_NONCOPYABLE(SQLTransactionCoordinator); WTF_MAKE_FAST_ALLOCATED;
49public:
50    SQLTransactionCoordinator();
51    void acquireLock(SQLTransactionBackend*);
52    void releaseLock(SQLTransactionBackend*);
53    void shutdown();
54private:
55    typedef Deque<RefPtr<SQLTransactionBackend> > TransactionsQueue;
56    struct CoordinationInfo {
57        TransactionsQueue pendingTransactions;
58        HashSet<RefPtr<SQLTransactionBackend> > activeReadTransactions;
59        RefPtr<SQLTransactionBackend> activeWriteTransaction;
60    };
61    // Maps database names to information about pending transactions
62    typedef HashMap<String, CoordinationInfo> CoordinationInfoMap;
63    CoordinationInfoMap m_coordinationInfoMap;
64    bool m_isShuttingDown;
65
66    void processPendingTransactions(CoordinationInfo&);
67};
68
69} // namespace WebCore
70
71#endif // ENABLE(SQL_DATABASE)
72
73#endif // SQLTransactionCoordinator_h
74