File: ScriptRunner.h

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/*
 * 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 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 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 ScriptRunner_h
#define ScriptRunner_h

#include "core/CoreExport.h"
#include "platform/heap/Handle.h"
#include "public/platform/WebTraceLocation.h"
#include "wtf/Deque.h"
#include "wtf/HashMap.h"
#include "wtf/Noncopyable.h"

namespace blink {

class Document;
class ScriptLoader;
class WebTaskRunner;

class CORE_EXPORT ScriptRunner final
    : public GarbageCollectedFinalized<ScriptRunner> {
  WTF_MAKE_NONCOPYABLE(ScriptRunner);

 public:
  static ScriptRunner* create(Document* document) {
    return new ScriptRunner(document);
  }

  // Async scripts may either execute asynchronously (as their load
  // completes), or 'in order'. See
  // http://www.html5rocks.com/en/tutorials/speed/script-loading/ for more
  // information.
  enum AsyncExecutionType { None, Async, InOrder };
  void queueScriptForExecution(ScriptLoader*, AsyncExecutionType);
  bool hasPendingScripts() const {
    return !m_pendingInOrderScripts.isEmpty() ||
           !m_pendingAsyncScripts.isEmpty();
  }
  void suspend();
  void resume();
  void notifyScriptReady(ScriptLoader*, AsyncExecutionType);
  void notifyScriptLoadError(ScriptLoader*, AsyncExecutionType);

  static void movePendingScript(Document&, Document&, ScriptLoader*);

  DECLARE_TRACE();

 private:
  class Task;

  explicit ScriptRunner(Document*);

  void movePendingScript(ScriptRunner*, ScriptLoader*);
  bool removePendingInOrderScript(ScriptLoader*);
  void scheduleReadyInOrderScripts();

  void postTask(const WebTraceLocation&);

  bool executeTaskFromQueue(HeapDeque<Member<ScriptLoader>>*);

  void executeTask();

  Member<Document> m_document;

  HeapDeque<Member<ScriptLoader>> m_pendingInOrderScripts;
  HeapHashSet<Member<ScriptLoader>> m_pendingAsyncScripts;

  // http://www.whatwg.org/specs/web-apps/current-work/#set-of-scripts-that-will-execute-as-soon-as-possible
  HeapDeque<Member<ScriptLoader>> m_asyncScriptsToExecuteSoon;
  HeapDeque<Member<ScriptLoader>> m_inOrderScriptsToExecuteSoon;

  RefPtr<WebTaskRunner> m_taskRunner;

  int m_numberOfInOrderScriptsWithPendingNotification;

  bool m_isSuspended;
#ifndef NDEBUG
  bool m_hasEverBeenSuspended;
#endif
};

}  // namespace blink

#endif  // ScriptRunner_h