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      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/ScriptExecutionContext.h"
     32 #include "wtf/TemporaryChange.h"
     33 
     34 namespace WebCore {
     35 
     36 ContextLifecycleNotifier::ContextLifecycleNotifier(ScriptExecutionContext* context)
     37     : LifecycleNotifier(context)
     38 {
     39 }
     40 
     41 ContextLifecycleNotifier::~ContextLifecycleNotifier()
     42 {
     43 }
     44 
     45 void ContextLifecycleNotifier::addObserver(LifecycleObserver* observer)
     46 {
     47     LifecycleNotifier::addObserver(observer);
     48 
     49     RELEASE_ASSERT(m_iterating != IteratingOverContextObservers);
     50     if (observer->observerType() == LifecycleObserver::ActiveDOMObjectType) {
     51         RELEASE_ASSERT(m_iterating != IteratingOverActiveDOMObjects);
     52         m_activeDOMObjects.add(static_cast<ActiveDOMObject*>(observer));
     53     }
     54 }
     55 
     56 void ContextLifecycleNotifier::removeObserver(LifecycleObserver* observer)
     57 {
     58     LifecycleNotifier::removeObserver(observer);
     59 
     60     RELEASE_ASSERT(m_iterating != IteratingOverContextObservers);
     61     if (observer->observerType() == LifecycleObserver::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)->scriptExecutionContext() == context());
     73         ASSERT((*iter)->suspendIfNeededCalled());
     74         (*iter)->resume();
     75     }
     76 }
     77 
     78 void ContextLifecycleNotifier::notifySuspendingActiveDOMObjects(ActiveDOMObject::ReasonForSuspension why)
     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)->scriptExecutionContext() == context());
     84         ASSERT((*iter)->suspendIfNeededCalled());
     85         (*iter)->suspend(why);
     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)->scriptExecutionContext() == context());
     95         ASSERT((*iter)->suspendIfNeededCalled());
     96         (*iter)->stop();
     97     }
     98 }
     99 
    100 bool ContextLifecycleNotifier::canSuspendActiveDOMObjects()
    101 {
    102     TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
    103     ActiveDOMObjectSet::iterator activeObjectsEnd = m_activeDOMObjects.end();
    104     for (ActiveDOMObjectSet::const_iterator iter = m_activeDOMObjects.begin(); iter != activeObjectsEnd; ++iter) {
    105         ASSERT((*iter)->scriptExecutionContext() == context());
    106         ASSERT((*iter)->suspendIfNeededCalled());
    107         if (!(*iter)->canSuspend())
    108             return false;
    109     }
    110 
    111     return true;
    112 }
    113 
    114 bool ContextLifecycleNotifier::hasPendingActivity() const
    115 {
    116     ActiveDOMObjectSet::const_iterator activeObjectsEnd = activeDOMObjects().end();
    117     for (ActiveDOMObjectSet::const_iterator iter = activeDOMObjects().begin(); iter != activeObjectsEnd; ++iter) {
    118         if ((*iter)->hasPendingActivity())
    119             return true;
    120     }
    121 
    122     return false;
    123 }
    124 
    125 } // namespace WebCore
    126 
    127