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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 "third_party/blink/renderer/core/html/custom/v0_custom_element_microtask_dispatcher.h"
#include "third_party/blink/renderer/core/html/custom/v0_custom_element_callback_queue.h"
#include "third_party/blink/renderer/core/html/custom/v0_custom_element_microtask_import_step.h"
#include "third_party/blink/renderer/core/html/custom/v0_custom_element_processing_stack.h"
#include "third_party/blink/renderer/core/html/custom/v0_custom_element_scheduler.h"
#include "third_party/blink/renderer/platform/bindings/microtask.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
namespace blink {
static const V0CustomElementCallbackQueue::ElementQueueId kMicrotaskQueueId = 0;
V0CustomElementMicrotaskDispatcher::V0CustomElementMicrotaskDispatcher()
: has_scheduled_microtask_(false), phase_(kQuiescent) {}
V0CustomElementMicrotaskDispatcher&
V0CustomElementMicrotaskDispatcher::Instance() {
DEFINE_STATIC_LOCAL(
Persistent<V0CustomElementMicrotaskDispatcher>, instance,
(MakeGarbageCollected<V0CustomElementMicrotaskDispatcher>()));
return *instance;
}
void V0CustomElementMicrotaskDispatcher::Enqueue(
V0CustomElementCallbackQueue* queue) {
EnsureMicrotaskScheduledForElementQueue();
queue->SetOwner(kMicrotaskQueueId);
elements_.push_back(queue);
}
void V0CustomElementMicrotaskDispatcher::
EnsureMicrotaskScheduledForElementQueue() {
DCHECK(phase_ == kQuiescent || phase_ == kResolving);
EnsureMicrotaskScheduled();
}
void V0CustomElementMicrotaskDispatcher::EnsureMicrotaskScheduled() {
if (!has_scheduled_microtask_) {
Microtask::EnqueueMicrotask(WTF::Bind(&Dispatch));
has_scheduled_microtask_ = true;
}
}
void V0CustomElementMicrotaskDispatcher::Dispatch() {
Instance().DoDispatch();
}
void V0CustomElementMicrotaskDispatcher::DoDispatch() {
DCHECK(IsMainThread());
DCHECK(phase_ == kQuiescent);
DCHECK(has_scheduled_microtask_);
has_scheduled_microtask_ = false;
// Finishing microtask work deletes all
// V0CustomElementCallbackQueues. Being in a callback delivery scope
// implies those queues could still be in use.
SECURITY_DCHECK(!V0CustomElementProcessingStack::InCallbackDeliveryScope());
phase_ = kResolving;
phase_ = kDispatchingCallbacks;
for (const auto& element : elements_) {
// Created callback may enqueue an attached callback.
V0CustomElementProcessingStack::CallbackDeliveryScope scope;
element->ProcessInElementQueue(kMicrotaskQueueId);
}
elements_.clear();
V0CustomElementScheduler::MicrotaskDispatcherDidFinish();
phase_ = kQuiescent;
}
void V0CustomElementMicrotaskDispatcher::Trace(Visitor* visitor) {
visitor->Trace(elements_);
}
} // namespace blink
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