third_party/WebKit/Source/modules/webaudio/AudioWorklet.h

// Copyright 2016 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 AudioWorklet_h
#define AudioWorklet_h

#include "core/workers/Worklet.h"
#include "modules/ModulesExport.h"
#include "platform/heap/Handle.h"

namespace blink {

class AudioWorkletMessagingProxy;
class BaseAudioContext;
class LocalFrame;

class MODULES_EXPORT AudioWorklet final : public Worklet {
  WTF_MAKE_NONCOPYABLE(AudioWorklet);

 public:
  static AudioWorklet* Create(LocalFrame*);
  ~AudioWorklet() override;

  void RegisterContext(BaseAudioContext*);
  void UnregisterContext(BaseAudioContext*);

  AudioWorkletMessagingProxy* FindAvailableMessagingProxy();

  virtual void Trace(blink::Visitor*);

 private:
  explicit AudioWorklet(LocalFrame*);

  // Implements Worklet.
  bool NeedsToCreateGlobalScope() final;
  WorkletGlobalScopeProxy* CreateGlobalScope() final;

  bool IsWorkletMessagingProxyCreated() const;

  // AudioWorklet keeps the reference of all active BaseAudioContexts, so it
  // can notify the contexts when a script is loaded in AudioWorkletGlobalScope.
  HeapHashSet<Member<BaseAudioContext>> contexts_;
};

}  // namespace blink

#endif  // AudioWorklet_h