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 |
117 | |