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[WebKit-https.git] / Source / WebCore / dom / ActiveDOMObject.cpp
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
33 namespace WebCore {
34
35 ActiveDOMObject::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
50 ActiveDOMObject::~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
68 void 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
82 void ActiveDOMObject::assertSuspendIfNeededWasCalled() const
83 {
84     ASSERT(m_suspendIfNeededWasCalled);
85 }
86
87 #endif
88
89 bool ActiveDOMObject::hasPendingActivity() const
90 {
91     return m_pendingActivityCount;
92 }
93
94 bool ActiveDOMObject::canSuspendForDocumentSuspension() const
95 {
96     return false;
97 }
98
99 void ActiveDOMObject::suspend(ReasonForSuspension)
100 {
101 }
102
103 void ActiveDOMObject::resume()
104 {
105 }
106
107 void ActiveDOMObject::stop()
108 {
109 }
110
111 bool ActiveDOMObject::isContextStopped() const
112 {
113     return !scriptExecutionContext() || scriptExecutionContext()->activeDOMObjectsAreStopped();
114 }
115
116 } // namespace WebCore