1/*
2 * Copyright (C) 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 * 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 COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 */
26
27#include "config.h"
28#include "ActiveDOMObject.h"
29
30#include "ScriptExecutionContext.h"
31#include "WorkerContext.h"
32#include "WorkerThread.h"
33
34namespace WebCore {
35
36ActiveDOMObject::ActiveDOMObject(ScriptExecutionContext* scriptExecutionContext)
37    : ContextDestructionObserver(scriptExecutionContext)
38    , m_pendingActivityCount(0)
39#if !ASSERT_DISABLED
40    , m_suspendIfNeededCalled(false)
41#endif
42{
43    if (!m_scriptExecutionContext)
44        return;
45
46    ASSERT(m_scriptExecutionContext->isContextThread());
47    m_scriptExecutionContext->didCreateActiveDOMObject(this);
48}
49
50ActiveDOMObject::~ActiveDOMObject()
51{
52    if (!m_scriptExecutionContext)
53        return;
54
55    ASSERT(m_suspendIfNeededCalled);
56
57    // ActiveDOMObject may be inherited by a sub-class whose life-cycle
58    // exceeds that of the associated ScriptExecutionContext. In those cases,
59    // m_scriptExecutionContext would/should have been nullified by
60    // ContextDestructionObserver::contextDestroyed() (which we implement /
61    // inherit). Hence, we should ensure that this is not 0 before use it
62    // here.
63    if (m_scriptExecutionContext) {
64        ASSERT(m_scriptExecutionContext->isContextThread());
65        m_scriptExecutionContext->willDestroyActiveDOMObject(this);
66    }
67}
68
69void ActiveDOMObject::suspendIfNeeded()
70{
71#if !ASSERT_DISABLED
72    ASSERT(!m_suspendIfNeededCalled);
73    m_suspendIfNeededCalled = true;
74#endif
75    if (!m_scriptExecutionContext)
76        return;
77
78    m_scriptExecutionContext->suspendActiveDOMObjectIfNeeded(this);
79}
80
81bool ActiveDOMObject::hasPendingActivity() const
82{
83    return m_pendingActivityCount;
84}
85
86bool ActiveDOMObject::canSuspend() const
87{
88    return false;
89}
90
91void ActiveDOMObject::suspend(ReasonForSuspension)
92{
93}
94
95void ActiveDOMObject::resume()
96{
97}
98
99void ActiveDOMObject::stop()
100{
101}
102
103} // namespace WebCore
104