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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/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         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 WebCore
    128