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/*
* Copyright (C) 2008 Apple 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.
*
*/
#pragma once
#include "ActiveDOMObject.h"
#include "EventTarget.h"
#include "ExceptionOr.h"
#include "MessagePortChannel.h"
#include "MessagePortIdentifier.h"
#include "MessageWithMessagePorts.h"
#include <wtf/WeakPtr.h>
namespace JSC {
class CallFrame;
class JSObject;
class JSValue;
}
namespace WebCore {
class Frame;
class WebCoreOpaqueRoot;
struct StructuredSerializeOptions;
class MessagePort final : public ActiveDOMObject, public EventTargetWithInlineData {
WTF_MAKE_NONCOPYABLE(MessagePort);
WTF_MAKE_ISO_ALLOCATED(MessagePort);
public:
static Ref<MessagePort> create(ScriptExecutionContext&, const MessagePortIdentifier& local, const MessagePortIdentifier& remote);
virtual ~MessagePort();
ExceptionOr<void> postMessage(JSC::JSGlobalObject&, JSC::JSValue message, StructuredSerializeOptions&&);
void start();
void close();
void entangle();
// Returns nullptr if the passed-in vector is empty.
static ExceptionOr<Vector<TransferredMessagePort>> disentanglePorts(Vector<RefPtr<MessagePort>>&&);
static Vector<RefPtr<MessagePort>> entanglePorts(ScriptExecutionContext&, Vector<TransferredMessagePort>&&);
WEBCORE_EXPORT static bool isExistingMessagePortLocallyReachable(const MessagePortIdentifier&);
WEBCORE_EXPORT static void notifyMessageAvailable(const MessagePortIdentifier&);
WEBCORE_EXPORT void messageAvailable();
bool started() const { return m_started; }
bool closed() const { return m_closed; }
void dispatchMessages();
// Returns null if there is no entangled port, or if the entangled port is run by a different thread.
// This is used solely to enable a GC optimization. Some platforms may not be able to determine ownership
// of the remote port (since it may live cross-process) - those platforms may always return null.
MessagePort* locallyEntangledPort() const;
const MessagePortIdentifier& identifier() const { return m_identifier; }
const MessagePortIdentifier& remoteIdentifier() const { return m_remoteIdentifier; }
WEBCORE_EXPORT void ref() const;
WEBCORE_EXPORT void deref() const;
WEBCORE_EXPORT bool isLocallyReachable() const;
// EventTargetWithInlineData.
EventTargetInterface eventTargetInterface() const final { return MessagePortEventTargetInterfaceType; }
ScriptExecutionContext* scriptExecutionContext() const final { return ActiveDOMObject::scriptExecutionContext(); }
void refEventTarget() final { ref(); }
void derefEventTarget() final { deref(); }
void dispatchEvent(Event&) final;
TransferredMessagePort disentangle();
static Ref<MessagePort> entangle(ScriptExecutionContext&, TransferredMessagePort&&);
private:
explicit MessagePort(ScriptExecutionContext&, const MessagePortIdentifier& local, const MessagePortIdentifier& remote);
bool addEventListener(const AtomString& eventType, Ref<EventListener>&&, const AddEventListenerOptions&) final;
bool removeEventListener(const AtomString& eventType, EventListener&, const EventListenerOptions&) final;
// ActiveDOMObject
const char* activeDOMObjectName() const final;
void contextDestroyed() final;
void stop() final { close(); }
bool virtualHasPendingActivity() const final;
void registerLocalActivity();
// A port starts out its life entangled, and remains entangled until it is closed or is cloned.
bool isEntangled() const { return !m_closed && m_entangled; }
void updateActivity(MessagePortChannelProvider::HasActivity);
bool m_started { false };
bool m_closed { false };
bool m_entangled { true };
// Flags to manage querying the remote port for GC purposes
mutable bool m_mightBeEligibleForGC { false };
mutable bool m_hasHadLocalActivitySinceLastCheck { false };
mutable bool m_isRemoteEligibleForGC { false };
mutable bool m_isAskingRemoteAboutGC { false };
bool m_hasMessageEventListener { false };
MessagePortIdentifier m_identifier;
MessagePortIdentifier m_remoteIdentifier;
mutable std::atomic<unsigned> m_refCount { 1 };
};
WebCoreOpaqueRoot root(MessagePort*);
} // namespace WebCore
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