1/*
2 * Copyright (C) 2007, 2008 Apple 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 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28#ifndef DatabaseThread_h
29#define DatabaseThread_h
30
31#include "platform/WebThreadSupportingGC.h"
32#include "platform/heap/Handle.h"
33#include "wtf/Deque.h"
34#include "wtf/HashMap.h"
35#include "wtf/HashSet.h"
36#include "wtf/OwnPtr.h"
37#include "wtf/PassOwnPtr.h"
38#include "wtf/PassRefPtr.h"
39#include "wtf/RefPtr.h"
40#include "wtf/ThreadSafeRefCounted.h"
41#include "wtf/ThreadingPrimitives.h"
42
43namespace blink {
44
45class Database;
46class DatabaseTask;
47class Document;
48class MessageLoopInterruptor;
49class PendingGCRunner;
50class SQLTransactionClient;
51class SQLTransactionCoordinator;
52class TaskSynchronizer;
53
54class DatabaseThread : public ThreadSafeRefCountedWillBeGarbageCollectedFinalized<DatabaseThread> {
55public:
56    static PassRefPtrWillBeRawPtr<DatabaseThread> create() { return adoptRefWillBeNoop(new DatabaseThread); }
57    ~DatabaseThread();
58    void trace(Visitor*);
59
60    void start();
61    void terminate();
62    bool terminationRequested() const;
63
64    void scheduleTask(PassOwnPtr<DatabaseTask>);
65
66    void recordDatabaseOpen(Database*);
67    void recordDatabaseClosed(Database*);
68    bool isDatabaseOpen(Database*);
69
70    bool isDatabaseThread() { return m_thread && m_thread->isCurrentThread(); }
71
72    SQLTransactionClient* transactionClient() { return m_transactionClient.get(); }
73    SQLTransactionCoordinator* transactionCoordinator() { return m_transactionCoordinator.get(); }
74
75private:
76    DatabaseThread();
77
78    void setupDatabaseThread();
79    void cleanupDatabaseThread();
80    void cleanupDatabaseThreadCompleted();
81
82    OwnPtr<WebThreadSupportingGC> m_thread;
83
84    // This set keeps track of the open databases that have been used on this thread.
85    // This must be updated in the database thread though it is constructed and
86    // destructed in the context thread.
87    WillBeHeapHashSet<RefPtrWillBeMember<Database> > m_openDatabaseSet;
88
89    OwnPtr<SQLTransactionClient> m_transactionClient;
90    OwnPtrWillBeMember<SQLTransactionCoordinator> m_transactionCoordinator;
91    TaskSynchronizer* m_cleanupSync;
92
93    mutable Mutex m_terminationRequestedMutex;
94    bool m_terminationRequested;
95};
96
97} // namespace blink
98
99#endif // DatabaseThread_h
100