File: V0CustomElementMicrotaskDispatcher.h

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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.

#ifndef V0CustomElementMicrotaskDispatcher_h
#define V0CustomElementMicrotaskDispatcher_h

#include "platform/heap/Handle.h"
#include "wtf/Noncopyable.h"
#include "wtf/Vector.h"

namespace blink {

class V0CustomElementCallbackQueue;

class V0CustomElementMicrotaskDispatcher final
    : public GarbageCollected<V0CustomElementMicrotaskDispatcher> {
  WTF_MAKE_NONCOPYABLE(V0CustomElementMicrotaskDispatcher);

 public:
  static V0CustomElementMicrotaskDispatcher& instance();

  void enqueue(V0CustomElementCallbackQueue*);

  bool elementQueueIsEmpty() { return m_elements.isEmpty(); }

  DECLARE_TRACE();

 private:
  V0CustomElementMicrotaskDispatcher();

  void ensureMicrotaskScheduledForElementQueue();
  void ensureMicrotaskScheduled();

  static void dispatch();
  void doDispatch();

  bool m_hasScheduledMicrotask;
  enum { Quiescent, Resolving, DispatchingCallbacks } m_phase;

  HeapVector<Member<V0CustomElementCallbackQueue>> m_elements;
};

}  // namespace blink

#endif  // V0CustomElementMicrotaskDispatcher_h