src/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,
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  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
  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         RELEASE_ASSERT(m_iterating != IteratingOverActiveDOMObjects);
  63         m_activeDOMObjects.remove(static_cast<ActiveDOMObject*>(observer));
  64     }
  65 }
  66
  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
  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
  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
 100 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