gecko-dev/dom/base/MessagePort.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_MessagePort_h
#define mozilla_dom_MessagePort_h
#include "mozilla/Attributes.h"
#include "mozilla/DOMEventTargetHelper.h"
class nsPIDOMWindow;
namespace mozilla {
namespace dom {
class DispatchEventRunnable;
class PostMessageRunnable;
class MessagePortBase : public DOMEventTargetHelper
{
protected:
explicit MessagePortBase(nsPIDOMWindow* aWindow);
MessagePortBase();
public:
virtual void
PostMessageMoz(JSContext* aCx, JS::Handle<JS::Value> aMessage,
const Optional<Sequence<JS::Value>>& aTransferable,
ErrorResult& aRv) = 0;
virtual void
Start() = 0;
virtual void
Close() = 0;
// The 'message' event handler has to call |Start()| method, so we
// cannot use IMPL_EVENT_HANDLER macro here.
virtual EventHandlerNonNull*
GetOnmessage() = 0;
virtual void
SetOnmessage(EventHandlerNonNull* aCallback) = 0;
// Duplicate this message port. This method is used by the Structured Clone
// Algorithm and makes the new MessagePort active with the entangled
// MessagePort of this object.
virtual already_AddRefed<MessagePortBase>
Clone() = 0;
};
class MessagePort final : public MessagePortBase
{
friend class DispatchEventRunnable;
friend class PostMessageRunnable;
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(MessagePort,
DOMEventTargetHelper)
explicit MessagePort(nsPIDOMWindow* aWindow);
virtual JSObject*
WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
virtual void
PostMessageMoz(JSContext* aCx, JS::Handle<JS::Value> aMessage,
const Optional<Sequence<JS::Value>>& aTransferable,
ErrorResult& aRv) override;
virtual void
Start() override;
virtual void
Close() override;
virtual EventHandlerNonNull*
GetOnmessage() override;
virtual void
SetOnmessage(EventHandlerNonNull* aCallback) override;
// Non WebIDL methods
// This method entangles this MessagePort with another one.
// If it is already entangled, it's disentangled first and enatangle to the
// new one.
void
Entangle(MessagePort* aMessagePort);
virtual already_AddRefed<MessagePortBase>
Clone() override;
private:
~MessagePort();
// Dispatch events from the Message Queue using a nsRunnable.
void Dispatch();
nsRefPtr<DispatchEventRunnable> mDispatchRunnable;
nsRefPtr<MessagePort> mEntangledPort;
nsTArray<nsRefPtr<PostMessageRunnable> > mMessageQueue;
bool mMessageQueueEnabled;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_MessagePort_h