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/*
* Copyright (C) 2010 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 "core/events/DOMWindowEventQueue.h"
#include "core/dom/TaskRunnerHelper.h"
#include "core/events/Event.h"
#include "core/frame/LocalDOMWindow.h"
#include "core/frame/SuspendableTimer.h"
#include "core/inspector/InspectorInstrumentation.h"
namespace blink {
class DOMWindowEventQueueTimer final
: public GarbageCollectedFinalized<DOMWindowEventQueueTimer>,
public SuspendableTimer {
USING_GARBAGE_COLLECTED_MIXIN(DOMWindowEventQueueTimer);
WTF_MAKE_NONCOPYABLE(DOMWindowEventQueueTimer);
public:
DOMWindowEventQueueTimer(DOMWindowEventQueue* eventQueue,
ExecutionContext* context)
// This queue is unthrottled because throttling IndexedDB events may break
// scenarios where several tabs, some of which are backgrounded, access
// the same database concurrently.
: SuspendableTimer(context, TaskType::Unthrottled),
m_eventQueue(eventQueue) {}
// Eager finalization is needed to promptly stop this timer object.
// (see DOMTimer comment for more.)
EAGERLY_FINALIZE();
DEFINE_INLINE_VIRTUAL_TRACE() {
visitor->trace(m_eventQueue);
SuspendableTimer::trace(visitor);
}
private:
virtual void fired() { m_eventQueue->pendingEventTimerFired(); }
Member<DOMWindowEventQueue> m_eventQueue;
};
DOMWindowEventQueue* DOMWindowEventQueue::create(ExecutionContext* context) {
return new DOMWindowEventQueue(context);
}
DOMWindowEventQueue::DOMWindowEventQueue(ExecutionContext* context)
: m_pendingEventTimer(new DOMWindowEventQueueTimer(this, context)),
m_isClosed(false) {
m_pendingEventTimer->suspendIfNeeded();
}
DOMWindowEventQueue::~DOMWindowEventQueue() {}
DEFINE_TRACE(DOMWindowEventQueue) {
visitor->trace(m_pendingEventTimer);
visitor->trace(m_queuedEvents);
EventQueue::trace(visitor);
}
bool DOMWindowEventQueue::enqueueEvent(Event* event) {
if (m_isClosed)
return false;
DCHECK(event->target());
InspectorInstrumentation::asyncTaskScheduled(
event->target()->getExecutionContext(), event->type(), event);
bool wasAdded = m_queuedEvents.add(event).isNewEntry;
DCHECK(wasAdded); // It should not have already been in the list.
if (!m_pendingEventTimer->isActive())
m_pendingEventTimer->startOneShot(0, BLINK_FROM_HERE);
return true;
}
bool DOMWindowEventQueue::cancelEvent(Event* event) {
HeapListHashSet<Member<Event>, 16>::iterator it = m_queuedEvents.find(event);
bool found = it != m_queuedEvents.end();
if (found) {
InspectorInstrumentation::asyncTaskCanceled(
event->target()->getExecutionContext(), event);
m_queuedEvents.remove(it);
}
if (m_queuedEvents.isEmpty())
m_pendingEventTimer->stop();
return found;
}
void DOMWindowEventQueue::close() {
m_isClosed = true;
m_pendingEventTimer->stop();
for (const auto& queuedEvent : m_queuedEvents) {
if (queuedEvent)
InspectorInstrumentation::asyncTaskCanceled(
queuedEvent->target()->getExecutionContext(), queuedEvent);
}
m_queuedEvents.clear();
}
void DOMWindowEventQueue::pendingEventTimerFired() {
DCHECK(!m_pendingEventTimer->isActive());
DCHECK(!m_queuedEvents.isEmpty());
// Insert a marker for where we should stop.
DCHECK(!m_queuedEvents.contains(nullptr));
bool wasAdded = m_queuedEvents.add(nullptr).isNewEntry;
DCHECK(wasAdded); // It should not have already been in the list.
while (!m_queuedEvents.isEmpty()) {
HeapListHashSet<Member<Event>, 16>::iterator iter = m_queuedEvents.begin();
Event* event = *iter;
m_queuedEvents.remove(iter);
if (!event)
break;
dispatchEvent(event);
}
}
void DOMWindowEventQueue::dispatchEvent(Event* event) {
EventTarget* eventTarget = event->target();
InspectorInstrumentation::AsyncTask asyncTask(
eventTarget->getExecutionContext(), event);
if (LocalDOMWindow* window = eventTarget->toLocalDOMWindow())
window->dispatchEvent(event, nullptr);
else
eventTarget->dispatchEvent(event);
}
} // namespace blink
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