chromium/src/third_party/blink/renderer/modules/broadcastchannel/broadcast_channel.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 THIRD_PARTY_BLINK_RENDERER_MODULES_BROADCASTCHANNEL_BROADCAST_CHANNEL_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_BROADCASTCHANNEL_BROADCAST_CHANNEL_H_

#include "base/macros.h"
#include "mojo/public/cpp/bindings/associated_receiver.h"
#include "mojo/public/cpp/bindings/associated_remote.h"
#include "third_party/blink/public/mojom/broadcastchannel/broadcast_channel.mojom-blink.h"
#include "third_party/blink/renderer/bindings/core/v8/active_script_wrappable.h"
#include "third_party/blink/renderer/core/dom/events/event_target.h"
#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_observer.h"
#include "third_party/blink/renderer/platform/scheduler/public/frame_or_worker_scheduler.h"
#include "third_party/blink/renderer/platform/weborigin/security_origin.h"

namespace blink {

class ScriptValue;

class BroadcastChannel final : public EventTargetWithInlineData,
                               public ActiveScriptWrappable<BroadcastChannel>,
                               public ExecutionContextLifecycleObserver,
                               public mojom::blink::BroadcastChannelClient {
  DEFINE_WRAPPERTYPEINFO();
  USING_PRE_FINALIZER(BroadcastChannel, Dispose);

 public:
  static BroadcastChannel* Create(ExecutionContext*,
                                  const String& name,
                                  ExceptionState&);

  BroadcastChannel(ExecutionContext*, const String& name);
  ~BroadcastChannel() override;
  void Dispose();

  // IDL
  String name() const { return name_; }
  void postMessage(const ScriptValue&, ExceptionState&);
  void close();
  DEFINE_ATTRIBUTE_EVENT_LISTENER(message, kMessage)
  DEFINE_ATTRIBUTE_EVENT_LISTENER(messageerror, kMessageerror)

  // EventTarget:
  const AtomicString& InterfaceName() const override;
  ExecutionContext* GetExecutionContext() const override {
    return ExecutionContextLifecycleObserver::GetExecutionContext();
  }

  // ScriptWrappable:
  bool HasPendingActivity() const override;

  // ExecutionContextLifecycleObserver:
  void ContextDestroyed() override;

  void Trace(Visitor*) const override;

 private:
  // mojom::blink::BroadcastChannelClient:
  void OnMessage(BlinkCloneableMessage) override;

  // Called when the mojo binding disconnects.
  void OnError();

  scoped_refptr<const SecurityOrigin> origin_;
  String name_;

  mojo::AssociatedReceiver<mojom::blink::BroadcastChannelClient> receiver_{
      this};
  mojo::AssociatedRemote<mojom::blink::BroadcastChannelClient> remote_client_;

  // Notifies the scheduler that a broadcast channel is active.
  FrameOrWorkerScheduler::SchedulingAffectingFeatureHandle
      feature_handle_for_scheduler_;

  DISALLOW_COPY_AND_ASSIGN(BroadcastChannel);
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_BROADCASTCHANNEL_BROADCAST_CHANNEL_H_