1/*
2 * Copyright (C) 2010 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 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "ResponsivenessTimer.h"
28
29#include "WorkItem.h"
30
31namespace WebKit {
32
33static const double kResponsivenessTimeout = 3;
34
35ResponsivenessTimer::ResponsivenessTimer(ResponsivenessTimer::Client* client)
36    : m_client(client)
37    , m_isResponsive(true)
38    , m_timer(RunLoop::main(), this, &ResponsivenessTimer::timerFired)
39{
40}
41
42ResponsivenessTimer::~ResponsivenessTimer()
43{
44    m_timer.stop();
45}
46
47void ResponsivenessTimer::invalidate()
48{
49    m_timer.stop();
50}
51
52void ResponsivenessTimer::timerFired()
53{
54    // We'll never schedule the timer unless we're responsive.
55    ASSERT(m_isResponsive);
56
57    m_isResponsive = false;
58    m_client->didBecomeUnresponsive(this);
59
60    m_timer.stop();
61}
62
63void ResponsivenessTimer::start()
64{
65    if (m_timer.isActive())
66        return;
67
68    if (!m_isResponsive)
69        return;
70
71    m_timer.startOneShot(kResponsivenessTimeout);
72}
73
74void ResponsivenessTimer::stop()
75{
76    if (!m_isResponsive) {
77        // We got a life sign from the web process!
78        m_client->didBecomeResponsive(this);
79        m_isResponsive = true;
80    }
81
82    m_timer.stop();
83}
84
85} // namespace WebKit
86