1/*
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3 * Copyright (C) 2011 Google, 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
7 * are met:
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 INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 */
27
28#ifndef DatabaseContext_h
29#define DatabaseContext_h
30
31#if ENABLE(SQL_DATABASE)
32
33#include "ActiveDOMObject.h"
34#include <wtf/RefPtr.h>
35#include <wtf/ThreadSafeRefCounted.h>
36
37#if PLATFORM(IOS)
38#include <wtf/Threading.h>
39#endif
40
41namespace WebCore {
42
43class Database;
44class DatabaseDetails;
45class DatabaseBackendContext;
46class DatabaseTaskSynchronizer;
47class DatabaseThread;
48
49class DatabaseContext : public ThreadSafeRefCounted<DatabaseContext>, private ActiveDOMObject {
50public:
51    virtual ~DatabaseContext();
52
53    PassRefPtr<DatabaseBackendContext> backend();
54    DatabaseThread* databaseThread();
55
56#if PLATFORM(IOS)
57    void setPaused(bool);
58#endif
59
60    void setHasOpenDatabases() { m_hasOpenDatabases = true; }
61    bool hasOpenDatabases() { return m_hasOpenDatabases; }
62
63    // When the database cleanup is done, the sychronizer will be signalled.
64    bool stopDatabases(DatabaseTaskSynchronizer*);
65
66    bool allowDatabaseAccess() const;
67    void databaseExceededQuota(const String& name, DatabaseDetails);
68
69private:
70    explicit DatabaseContext(ScriptExecutionContext*);
71
72    void stopDatabases() { stopDatabases(nullptr); }
73
74    virtual void contextDestroyed() override final;
75    virtual void stop() override final;
76
77    RefPtr<DatabaseThread> m_databaseThread;
78    bool m_hasOpenDatabases; // This never changes back to false, even after the database thread is closed.
79    bool m_isRegistered;
80    bool m_hasRequestedTermination;
81
82    friend class DatabaseBackendContext;
83    friend class DatabaseManager;
84
85#if PLATFORM(IOS)
86    Mutex m_databaseThreadMutex;
87    bool m_paused;
88#endif
89};
90
91} // namespace WebCore
92
93#endif // ENABLE(SQL_DATABASE)
94
95#endif // DatabaseContext_h
96