| // 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 "bindings/core/v8/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" |
| |
| namespace blink { |
| |
| static const CustomElementCallbackQueue::ElementQueueId kMicrotaskQueueId = 0; |
| |
| CustomElementMicrotaskDispatcher::CustomElementMicrotaskDispatcher() |
| : m_hasScheduledMicrotask(false) |
| , m_phase(Quiescent) |
| { |
| } |
| |
| CustomElementMicrotaskDispatcher& CustomElementMicrotaskDispatcher::instance() |
| { |
| DEFINE_STATIC_LOCAL(CustomElementMicrotaskDispatcher, instance, (new CustomElementMicrotaskDispatcher)); |
| return instance; |
| } |
| |
| void CustomElementMicrotaskDispatcher::enqueue(CustomElementCallbackQueue* queue) |
| { |
| ensureMicrotaskScheduledForElementQueue(); |
| queue->setOwner(kMicrotaskQueueId); |
| m_elements.append(queue); |
| } |
| |
| void CustomElementMicrotaskDispatcher::ensureMicrotaskScheduledForElementQueue() |
| { |
| DCHECK(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() |
| { |
| DCHECK(isMainThread()); |
| |
| DCHECK(m_phase == Quiescent); |
| DCHECK(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) |
| { |
| visitor->trace(m_elements); |
| } |
| |
| } // namespace blink |