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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/dom/custom/CustomElementMicrotaskDispatcher.h"
#include "core/dom/Microtask.h"
#include "core/dom/custom/CustomElementCallbackQueue.h"
#include "core/dom/custom/CustomElementMicrotaskImportStep.h"
#include "core/dom/custom/CustomElementProcessingStack.h"
#include "core/dom/custom/CustomElementScheduler.h"
#include "wtf/MainThread.h"
namespace blink {
static const CustomElementCallbackQueue::ElementQueueId kMicrotaskQueueId = 0;
CustomElementMicrotaskDispatcher::CustomElementMicrotaskDispatcher()
: m_hasScheduledMicrotask(false)
, m_phase(Quiescent)
{
}
DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(CustomElementMicrotaskDispatcher)
CustomElementMicrotaskDispatcher& CustomElementMicrotaskDispatcher::instance()
{
DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<CustomElementMicrotaskDispatcher>, instance, (adoptPtrWillBeNoop(new CustomElementMicrotaskDispatcher())));
return *instance;
}
void CustomElementMicrotaskDispatcher::enqueue(CustomElementCallbackQueue* queue)
{
ensureMicrotaskScheduledForElementQueue();
queue->setOwner(kMicrotaskQueueId);
m_elements.append(queue);
}
void CustomElementMicrotaskDispatcher::ensureMicrotaskScheduledForElementQueue()
{
ASSERT(m_phase == Quiescent || m_phase == Resolving);
ensureMicrotaskScheduled();
}
void CustomElementMicrotaskDispatcher::ensureMicrotaskScheduled()
{
if (!m_hasScheduledMicrotask) {
Microtask::enqueueMicrotask(WTF::bind(&dispatch));
m_hasScheduledMicrotask = true;
}
}
void CustomElementMicrotaskDispatcher::dispatch()
{
instance().doDispatch();
}
void CustomElementMicrotaskDispatcher::doDispatch()
{
ASSERT(isMainThread());
ASSERT(m_phase == Quiescent && m_hasScheduledMicrotask);
m_hasScheduledMicrotask = false;
// Finishing microtask work deletes all
// CustomElementCallbackQueues. Being in a callback delivery scope
// implies those queues could still be in use.
ASSERT_WITH_SECURITY_IMPLICATION(!CustomElementProcessingStack::inCallbackDeliveryScope());
m_phase = Resolving;
m_phase = DispatchingCallbacks;
for (const auto& element : m_elements) {
// Created callback may enqueue an attached callback.
CustomElementProcessingStack::CallbackDeliveryScope scope;
element->processInElementQueue(kMicrotaskQueueId);
}
m_elements.clear();
CustomElementScheduler::microtaskDispatcherDidFinish();
m_phase = Quiescent;
}
DEFINE_TRACE(CustomElementMicrotaskDispatcher)
{
#if ENABLE(OILPAN)
visitor->trace(m_elements);
#endif
}
} // namespace blink
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