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/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
* Copyright (C) 2013 Google Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "config.h"
#include "core/dom/ContextLifecycleNotifier.h"
#include "core/dom/ExecutionContext.h"
#include "wtf/TemporaryChange.h"
namespace WebCore {
ContextLifecycleNotifier::ContextLifecycleNotifier(ExecutionContext* context)
: LifecycleNotifier<ExecutionContext>(context)
{
}
ContextLifecycleNotifier::~ContextLifecycleNotifier()
{
}
void ContextLifecycleNotifier::addObserver(ContextLifecycleNotifier::Observer* observer)
{
LifecycleNotifier<ExecutionContext>::addObserver(observer);
RELEASE_ASSERT(m_iterating != IteratingOverContextObservers);
if (observer->observerType() == Observer::ActiveDOMObjectType) {
RELEASE_ASSERT(m_iterating != IteratingOverActiveDOMObjects);
m_activeDOMObjects.add(static_cast<ActiveDOMObject*>(observer));
}
}
void ContextLifecycleNotifier::removeObserver(ContextLifecycleNotifier::Observer* observer)
{
LifecycleNotifier<ExecutionContext>::removeObserver(observer);
RELEASE_ASSERT(m_iterating != IteratingOverContextObservers);
if (observer->observerType() == Observer::ActiveDOMObjectType) {
m_activeDOMObjects.remove(static_cast<ActiveDOMObject*>(observer));
}
}
void ContextLifecycleNotifier::notifyResumingActiveDOMObjects()
{
TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
Vector<ActiveDOMObject*> snapshotOfActiveDOMObjects;
copyToVector(m_activeDOMObjects, snapshotOfActiveDOMObjects);
for (Vector<ActiveDOMObject*>::iterator iter = snapshotOfActiveDOMObjects.begin(); iter != snapshotOfActiveDOMObjects.end(); iter++) {
// FIXME: Oilpan: At the moment, it's possible that the ActiveDOMObject is destructed
// during the iteration. Once we move ActiveDOMObject to the heap and
// make m_activeDOMObjects a HeapHashSet<WeakMember<ActiveDOMObject>>,
// it's no longer possible that ActiveDOMObject is destructed during the iteration,
// so we can remove the hack (i.e., we can just iterate m_activeDOMObjects without
// taking a snapshot). For more details, see https://codereview.chromium.org/247253002/.
if (m_activeDOMObjects.contains(*iter)) {
ASSERT((*iter)->executionContext() == context());
ASSERT((*iter)->suspendIfNeededCalled());
(*iter)->resume();
}
}
}
void ContextLifecycleNotifier::notifySuspendingActiveDOMObjects()
{
TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
Vector<ActiveDOMObject*> snapshotOfActiveDOMObjects;
copyToVector(m_activeDOMObjects, snapshotOfActiveDOMObjects);
for (Vector<ActiveDOMObject*>::iterator iter = snapshotOfActiveDOMObjects.begin(); iter != snapshotOfActiveDOMObjects.end(); iter++) {
// It's possible that the ActiveDOMObject is already destructed.
// See a FIXME above.
if (m_activeDOMObjects.contains(*iter)) {
ASSERT((*iter)->executionContext() == context());
ASSERT((*iter)->suspendIfNeededCalled());
(*iter)->suspend();
}
}
}
void ContextLifecycleNotifier::notifyStoppingActiveDOMObjects()
{
TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
Vector<ActiveDOMObject*> snapshotOfActiveDOMObjects;
copyToVector(m_activeDOMObjects, snapshotOfActiveDOMObjects);
for (Vector<ActiveDOMObject*>::iterator iter = snapshotOfActiveDOMObjects.begin(); iter != snapshotOfActiveDOMObjects.end(); iter++) {
// It's possible that the ActiveDOMObject is already destructed.
// See a FIXME above.
if (m_activeDOMObjects.contains(*iter)) {
ASSERT((*iter)->executionContext() == context());
ASSERT((*iter)->suspendIfNeededCalled());
(*iter)->stop();
}
}
}
bool ContextLifecycleNotifier::hasPendingActivity() const
{
for (ActiveDOMObjectSet::const_iterator iter = m_activeDOMObjects.begin(); iter != m_activeDOMObjects.end(); ++iter) {
if ((*iter)->hasPendingActivity())
return true;
}
return false;
}
} // namespace WebCore
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