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 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 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 "Document.h"
31#include "ScriptExecutionContext.h"
32
33namespace WebCore {
34
35ActiveDOMObject::ActiveDOMObject(ScriptExecutionContext* scriptExecutionContext)
36 : ContextDestructionObserver(scriptExecutionContext)
37 , m_pendingActivityCount(0)
38#if !ASSERT_DISABLED
39 , m_suspendIfNeededWasCalled(false)
40#endif
41{
42 ASSERT(!is<Document>(m_scriptExecutionContext) || &downcast<Document>(m_scriptExecutionContext)->contextDocument() == downcast<Document>(m_scriptExecutionContext));
43 if (!m_scriptExecutionContext)
44 return;
45
46 ASSERT(m_scriptExecutionContext->isContextThread());
47 m_scriptExecutionContext->didCreateActiveDOMObject(*this);
48}
49
50ActiveDOMObject::~ActiveDOMObject()
51{
52 ASSERT(canAccessThreadLocalDataForThread(m_creationThread));
53
54 // ActiveDOMObject may be inherited by a sub-class whose life-cycle
55 // exceeds that of the associated ScriptExecutionContext. In those cases,
56 // m_scriptExecutionContext would/should have been nullified by
57 // ContextDestructionObserver::contextDestroyed() (which we implement /
58 // inherit). Hence, we should ensure that this is not 0 before use it
59 // here.
60 if (!m_scriptExecutionContext)
61 return;
62
63 ASSERT(m_suspendIfNeededWasCalled);
64 ASSERT(m_scriptExecutionContext->isContextThread());
65 m_scriptExecutionContext->willDestroyActiveDOMObject(*this);
66}
67
68void ActiveDOMObject::suspendIfNeeded()
69{
70#if !ASSERT_DISABLED
71 ASSERT(!m_suspendIfNeededWasCalled);
72 m_suspendIfNeededWasCalled = true;
73#endif
74 if (!m_scriptExecutionContext)
75 return;
76
77 m_scriptExecutionContext->suspendActiveDOMObjectIfNeeded(*this);
78}
79
80#if !ASSERT_DISABLED
81
82void ActiveDOMObject::assertSuspendIfNeededWasCalled() const
83{
84 ASSERT(m_suspendIfNeededWasCalled);
85}
86
87#endif
88
89bool ActiveDOMObject::hasPendingActivity() const
90{
91 return m_pendingActivityCount;
92}
93
94bool ActiveDOMObject::canSuspendForDocumentSuspension() const
95{
96 return false;
97}
98
99void ActiveDOMObject::suspend(ReasonForSuspension)
100{
101}
102
103void ActiveDOMObject::resume()
104{
105}
106
107void ActiveDOMObject::stop()
108{
109}
110
111bool ActiveDOMObject::isContextStopped() const
112{
113 return !scriptExecutionContext() || scriptExecutionContext()->activeDOMObjectsAreStopped();
114}
115
116} // namespace WebCore
117