1/*
2 * Copyright (C) 2013 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 are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Neither the name of Google Inc. nor the names of its
11 * contributors may be used to endorse or promote products derived from
12 * this software without specific prior written permission.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY 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#ifndef MainThreadTaskRunner_h
28#define MainThreadTaskRunner_h
29
30#include "platform/Timer.h"
31
32#include "wtf/FastAllocBase.h"
33#include "wtf/Noncopyable.h"
34#include "wtf/OwnPtr.h"
35#include "wtf/PassOwnPtr.h"
36#include "wtf/Vector.h"
37#include "wtf/WeakPtr.h"
38
39namespace blink {
40
41class ExecutionContext;
42class ExecutionContextTask;
43
44class MainThreadTaskRunner {
45    WTF_MAKE_NONCOPYABLE(MainThreadTaskRunner);
46    WTF_MAKE_FAST_ALLOCATED;
47
48public:
49    static PassOwnPtr<MainThreadTaskRunner> create(ExecutionContext*);
50
51    ~MainThreadTaskRunner();
52
53    void postTask(PassOwnPtr<ExecutionContextTask>); // Executes the task on context's thread asynchronously.
54    void postInspectorTask(PassOwnPtr<ExecutionContextTask>);
55    void perform(PassOwnPtr<ExecutionContextTask>, bool);
56
57    void suspend();
58    void resume();
59
60private:
61    explicit MainThreadTaskRunner(ExecutionContext*);
62
63    void pendingTasksTimerFired(Timer<MainThreadTaskRunner>*);
64
65    ExecutionContext* m_context;
66    WeakPtrFactory<MainThreadTaskRunner> m_weakFactory;
67    Timer<MainThreadTaskRunner> m_pendingTasksTimer;
68    Vector<OwnPtr<ExecutionContextTask> > m_pendingTasks;
69    bool m_suspended;
70};
71
72inline PassOwnPtr<MainThreadTaskRunner> MainThreadTaskRunner::create(ExecutionContext* context)
73{
74    return adoptPtr(new MainThreadTaskRunner(context));
75}
76
77} // namespace
78
79#endif
80