third_party/WebKit/Source/core/workers/WorkerEventQueue.h

/*
 * 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.
 *
 */

#ifndef WorkerEventQueue_h
#define WorkerEventQueue_h

#include "core/events/EventQueue.h"
#include "wtf/HashSet.h"

namespace blink {

class Event;
class ExecutionContext;

class WorkerEventQueue final : public EventQueue {
 public:
  static WorkerEventQueue* create(ExecutionContext*);
  ~WorkerEventQueue() override;
  DECLARE_TRACE();

  // EventQueue
  bool enqueueEvent(Event*) override;
  bool cancelEvent(Event*) override;
  void close() override;

 private:
  explicit WorkerEventQueue(ExecutionContext*);
  bool removeEvent(Event*);
  void dispatchEvent(Event*, ExecutionContext*);

  Member<ExecutionContext> m_executionContext;
  bool m_isClosed;

  HeapHashSet<Member<Event>> m_pendingEvents;
};

}  // namespace blink

#endif  // WorkerEventQueue_h