third_party/WebKit/Source/core/dom/ContextLifecycleNotifier.cpp

   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/ActiveDOMObject.h"
  32 #include "wtf/TemporaryChange.h"
  33
  34 namespace blink {
  35
  36 void ContextLifecycleNotifier::notifyResumingActiveDOMObjects()
  37 {
  38     TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
  39     Vector<ContextLifecycleObserver*> snapshotOfObservers;
  40     copyToVector(m_observers, snapshotOfObservers);
  41     for (ContextLifecycleObserver* observer : snapshotOfObservers) {
  42         // FIXME: Oilpan: At the moment, it's possible that a ActiveDOMObject
  43         // observer is destructed while iterating. Once we enable Oilpan by default
  44         // for all LifecycleObserver<T>s, we can remove the hack by making m_observers
  45         // a HeapHashSet<WeakMember<LifecycleObserver<T>>>.
  46         // (i.e., we can just iterate m_observers without taking a snapshot).
  47         // For more details, see https://codereview.chromium.org/247253002/.
  48         if (m_observers.contains(observer)) {
  49             if (observer->observerType() != ContextLifecycleObserver::ActiveDOMObjectType)
  50                 continue;
  51             ActiveDOMObject* activeDOMObject = static_cast<ActiveDOMObject*>(observer);
  52             ASSERT(activeDOMObject->executionContext() == context());
  53             ASSERT(activeDOMObject->suspendIfNeededCalled());
  54             activeDOMObject->resume();
  55         }
  56     }
  57 }
  58
  59 void ContextLifecycleNotifier::notifySuspendingActiveDOMObjects()
  60 {
  61     TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
  62     Vector<ContextLifecycleObserver*> snapshotOfObservers;
  63     copyToVector(m_observers, snapshotOfObservers);
  64     for (ContextLifecycleObserver* observer : snapshotOfObservers) {
  65         // It's possible that the ActiveDOMObject is already destructed.
  66         // See a FIXME above.
  67         if (m_observers.contains(observer)) {
  68             if (observer->observerType() != ContextLifecycleObserver::ActiveDOMObjectType)
  69                 continue;
  70             ActiveDOMObject* activeDOMObject = static_cast<ActiveDOMObject*>(observer);
  71             ASSERT(activeDOMObject->executionContext() == context());
  72             ASSERT(activeDOMObject->suspendIfNeededCalled());
  73             activeDOMObject->suspend();
  74         }
  75     }
  76 }
  77
  78 void ContextLifecycleNotifier::notifyStoppingActiveDOMObjects()
  79 {
  80     TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
  81     Vector<ContextLifecycleObserver*> snapshotOfObservers;
  82     copyToVector(m_observers, snapshotOfObservers);
  83     for (ContextLifecycleObserver* observer : snapshotOfObservers) {
  84         // It's possible that the ActiveDOMObject is already destructed.
  85         // See a FIXME above.
  86         if (m_observers.contains(observer)) {
  87             if (observer->observerType() != ContextLifecycleObserver::ActiveDOMObjectType)
  88                 continue;
  89             ActiveDOMObject* activeDOMObject = static_cast<ActiveDOMObject*>(observer);
  90             ASSERT(activeDOMObject->executionContext() == context());
  91             ASSERT(activeDOMObject->suspendIfNeededCalled());
  92             activeDOMObject->stop();
  93         }
  94     }
  95 }
  96
  97 unsigned ContextLifecycleNotifier::activeDOMObjectCount() const
  98 {
  99     unsigned activeDOMObjects = 0;
 100     for (ContextLifecycleObserver* observer : m_observers) {
 101         if (observer->observerType() != ContextLifecycleObserver::ActiveDOMObjectType)
 102             continue;
 103         activeDOMObjects++;
 104     }
 105     return activeDOMObjects;
 106 }
 107
 108 bool ContextLifecycleNotifier::hasPendingActivity() const
 109 {
 110     for (ContextLifecycleObserver* observer : m_observers) {
 111         if (observer->observerType() != ContextLifecycleObserver::ActiveDOMObjectType)
 112             continue;
 113         ActiveDOMObject* activeDOMObject = static_cast<ActiveDOMObject*>(observer);
 114         if (activeDOMObject->hasPendingActivity())
 115             return true;
 116     }
 117     return false;
 118 }
 119
 120 #if ENABLE(ASSERT)
 121 bool ContextLifecycleNotifier::contains(ActiveDOMObject* object) const
 122 {
 123     for (ContextLifecycleObserver* observer : m_observers) {
 124         if (observer->observerType() != ContextLifecycleObserver::ActiveDOMObjectType)
 125             continue;
 126         ActiveDOMObject* activeDOMObject = static_cast<ActiveDOMObject*>(observer);
 127         if (activeDOMObject == object)
 128             return true;
 129     }
 130     return false;
 131 }
 132 #endif
 133
 134 } // namespace blink