1 /*
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3 * Copyright (C) 2013 Google Inc. All Rights Reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 */
27
28 #include "config.h"
29 #include "core/dom/ContextLifecycleNotifier.h"
30
31 #include "core/dom/ExecutionContext.h"
32 #include "wtf/TemporaryChange.h"
33
34 namespace WebCore {
35
ContextLifecycleNotifier(ExecutionContext * context)36 ContextLifecycleNotifier::ContextLifecycleNotifier(ExecutionContext* context)
37 : LifecycleNotifier<ExecutionContext>(context)
38 {
39 }
40
~ContextLifecycleNotifier()41 ContextLifecycleNotifier::~ContextLifecycleNotifier()
42 {
43 }
44
addObserver(ContextLifecycleNotifier::Observer * observer)45 void ContextLifecycleNotifier::addObserver(ContextLifecycleNotifier::Observer* observer)
46 {
47 LifecycleNotifier<ExecutionContext>::addObserver(observer);
48
49 RELEASE_ASSERT(m_iterating != IteratingOverContextObservers);
50 if (observer->observerType() == Observer::ActiveDOMObjectType) {
51 RELEASE_ASSERT(m_iterating != IteratingOverActiveDOMObjects);
52 m_activeDOMObjects.add(static_cast<ActiveDOMObject*>(observer));
53 }
54 }
55
removeObserver(ContextLifecycleNotifier::Observer * observer)56 void ContextLifecycleNotifier::removeObserver(ContextLifecycleNotifier::Observer* observer)
57 {
58 LifecycleNotifier<ExecutionContext>::removeObserver(observer);
59
60 RELEASE_ASSERT(m_iterating != IteratingOverContextObservers);
61 if (observer->observerType() == Observer::ActiveDOMObjectType) {
62 RELEASE_ASSERT(m_iterating != IteratingOverActiveDOMObjects);
63 m_activeDOMObjects.remove(static_cast<ActiveDOMObject*>(observer));
64 }
65 }
66
notifyResumingActiveDOMObjects()67 void ContextLifecycleNotifier::notifyResumingActiveDOMObjects()
68 {
69 TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
70 ActiveDOMObjectSet::iterator activeObjectsEnd = m_activeDOMObjects.end();
71 for (ActiveDOMObjectSet::iterator iter = m_activeDOMObjects.begin(); iter != activeObjectsEnd; ++iter) {
72 ASSERT((*iter)->executionContext() == context());
73 ASSERT((*iter)->suspendIfNeededCalled());
74 (*iter)->resume();
75 }
76 }
77
notifySuspendingActiveDOMObjects()78 void ContextLifecycleNotifier::notifySuspendingActiveDOMObjects()
79 {
80 TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
81 ActiveDOMObjectSet::iterator activeObjectsEnd = m_activeDOMObjects.end();
82 for (ActiveDOMObjectSet::iterator iter = m_activeDOMObjects.begin(); iter != activeObjectsEnd; ++iter) {
83 ASSERT((*iter)->executionContext() == context());
84 ASSERT((*iter)->suspendIfNeededCalled());
85 (*iter)->suspend();
86 }
87 }
88
notifyStoppingActiveDOMObjects()89 void ContextLifecycleNotifier::notifyStoppingActiveDOMObjects()
90 {
91 TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
92 ActiveDOMObjectSet::iterator activeObjectsEnd = m_activeDOMObjects.end();
93 for (ActiveDOMObjectSet::iterator iter = m_activeDOMObjects.begin(); iter != activeObjectsEnd; ++iter) {
94 ASSERT((*iter)->executionContext() == context());
95 ASSERT((*iter)->suspendIfNeededCalled());
96 (*iter)->stop();
97 }
98 }
99
hasPendingActivity() const100 bool ContextLifecycleNotifier::hasPendingActivity() const
101 {
102 ActiveDOMObjectSet::const_iterator activeObjectsEnd = activeDOMObjects().end();
103 for (ActiveDOMObjectSet::const_iterator iter = activeDOMObjects().begin(); iter != activeObjectsEnd; ++iter) {
104 if ((*iter)->hasPendingActivity())
105 return true;
106 }
107
108 return false;
109 }
110
111 } // namespace WebCore
112