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 blink { 35 36 ContextLifecycleNotifier::ContextLifecycleNotifier(ExecutionContext* context) 37 : LifecycleNotifier<ExecutionContext>(context) 38 { 39 } 40 41 ContextLifecycleNotifier::~ContextLifecycleNotifier() 42 { 43 } 44 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 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 m_activeDOMObjects.remove(static_cast<ActiveDOMObject*>(observer)); 63 } 64 } 65 66 void ContextLifecycleNotifier::notifyResumingActiveDOMObjects() 67 { 68 TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects); 69 Vector<ActiveDOMObject*> snapshotOfActiveDOMObjects; 70 copyToVector(m_activeDOMObjects, snapshotOfActiveDOMObjects); 71 for (Vector<ActiveDOMObject*>::iterator iter = snapshotOfActiveDOMObjects.begin(); iter != snapshotOfActiveDOMObjects.end(); iter++) { 72 // FIXME: Oilpan: At the moment, it's possible that the ActiveDOMObject is destructed 73 // during the iteration. Once we move ActiveDOMObject to the heap and 74 // make m_activeDOMObjects a HeapHashSet<WeakMember<ActiveDOMObject>>, 75 // it's no longer possible that ActiveDOMObject is destructed during the iteration, 76 // so we can remove the hack (i.e., we can just iterate m_activeDOMObjects without 77 // taking a snapshot). For more details, see https://codereview.chromium.org/247253002/. 78 if (m_activeDOMObjects.contains(*iter)) { 79 ASSERT((*iter)->executionContext() == context()); 80 ASSERT((*iter)->suspendIfNeededCalled()); 81 (*iter)->resume(); 82 } 83 } 84 } 85 86 void ContextLifecycleNotifier::notifySuspendingActiveDOMObjects() 87 { 88 TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects); 89 Vector<ActiveDOMObject*> snapshotOfActiveDOMObjects; 90 copyToVector(m_activeDOMObjects, snapshotOfActiveDOMObjects); 91 for (Vector<ActiveDOMObject*>::iterator iter = snapshotOfActiveDOMObjects.begin(); iter != snapshotOfActiveDOMObjects.end(); iter++) { 92 // It's possible that the ActiveDOMObject is already destructed. 93 // See a FIXME above. 94 if (m_activeDOMObjects.contains(*iter)) { 95 ASSERT((*iter)->executionContext() == context()); 96 ASSERT((*iter)->suspendIfNeededCalled()); 97 (*iter)->suspend(); 98 } 99 } 100 } 101 102 void ContextLifecycleNotifier::notifyStoppingActiveDOMObjects() 103 { 104 TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects); 105 Vector<ActiveDOMObject*> snapshotOfActiveDOMObjects; 106 copyToVector(m_activeDOMObjects, snapshotOfActiveDOMObjects); 107 for (Vector<ActiveDOMObject*>::iterator iter = snapshotOfActiveDOMObjects.begin(); iter != snapshotOfActiveDOMObjects.end(); iter++) { 108 // It's possible that the ActiveDOMObject is already destructed. 109 // See a FIXME above. 110 if (m_activeDOMObjects.contains(*iter)) { 111 ASSERT((*iter)->executionContext() == context()); 112 ASSERT((*iter)->suspendIfNeededCalled()); 113 (*iter)->stop(); 114 } 115 } 116 } 117 118 bool ContextLifecycleNotifier::hasPendingActivity() const 119 { 120 for (ActiveDOMObjectSet::const_iterator iter = m_activeDOMObjects.begin(); iter != m_activeDOMObjects.end(); ++iter) { 121 if ((*iter)->hasPendingActivity()) 122 return true; 123 } 124 return false; 125 } 126 127 } // namespace blink 128