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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 COMPUTER, 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 COMPUTER, 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 MessagePort_h
#define MessagePort_h
#include "AtomicStringHash.h"
#include "EventListener.h"
#include "EventTarget.h"
#include <wtf/HashMap.h>
#include <wtf/MessageQueue.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
namespace WebCore {
class AtomicStringImpl;
class Event;
class Frame;
class ScriptExecutionContext;
class String;
class WorkerContext;
class MessagePort : public RefCounted<MessagePort>, public EventTarget {
public:
static PassRefPtr<MessagePort> create(ScriptExecutionContext* scriptExecutionContext) { return adoptRef(new MessagePort(scriptExecutionContext)); }
~MessagePort();
PassRefPtr<MessagePort> clone(ExceptionCode&); // Returns a port that isn't attached to any context.
bool active() const { return m_entangledPort; }
void postMessage(const String& message, ExceptionCode&);
void postMessage(const String& message, MessagePort*, ExceptionCode&);
PassRefPtr<MessagePort> startConversation(ScriptExecutionContext*, const String& message);
void start();
void close();
bool queueIsOpen() const { return m_queueIsOpen; }
MessagePort* entangledPort() { return m_entangledPort; }
static void entangle(MessagePort*, MessagePort*);
void unentangle();
void contextDestroyed();
void attachToContext(ScriptExecutionContext*);
virtual ScriptExecutionContext* scriptExecutionContext() const;
virtual MessagePort* toMessagePort() { return this; }
void queueCloseEvent();
void dispatchMessages();
virtual void addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture);
virtual void removeEventListener(const AtomicString& eventType, EventListener*, bool useCapture);
virtual bool dispatchEvent(PassRefPtr<Event>, ExceptionCode&);
typedef Vector<RefPtr<EventListener> > ListenerVector;
typedef HashMap<AtomicString, ListenerVector> EventListenersMap;
EventListenersMap& eventListeners() { return m_eventListeners; }
using RefCounted<MessagePort>::ref;
using RefCounted<MessagePort>::deref;
bool hasPendingActivity();
// FIXME: Per current spec, setting onmessage should automagically start the port (unlike addEventListener("message", ...)).
void setOnmessage(PassRefPtr<EventListener> eventListener) { m_onMessageListener = eventListener; }
EventListener* onmessage() const { return m_onMessageListener.get(); }
void setOnclose(PassRefPtr<EventListener> eventListener) { m_onCloseListener = eventListener; }
EventListener* onclose() const { return m_onCloseListener.get(); }
private:
friend class MessagePortCloseEventTask;
MessagePort(ScriptExecutionContext*);
virtual void refEventTarget() { ref(); }
virtual void derefEventTarget() { deref(); }
void dispatchCloseEvent();
MessagePort* m_entangledPort;
// FIXME: EventData is necessary to pass messages to other threads. In single threaded case, we can just queue a created event.
struct EventData : public RefCounted<EventData> {
static PassRefPtr<EventData> create(const String& message, PassRefPtr<MessagePort>);
~EventData();
String message;
RefPtr<MessagePort> messagePort;
private:
EventData(const String& message, PassRefPtr<MessagePort>);
};
MessageQueue<RefPtr<EventData> > m_messageQueue; // FIXME: No need to use MessageQueue in single threaded case.
bool m_queueIsOpen;
ScriptExecutionContext* m_scriptExecutionContext;
RefPtr<EventListener> m_onMessageListener;
RefPtr<EventListener> m_onCloseListener;
EventListenersMap m_eventListeners;
bool m_pendingCloseEvent; // The port is GC protected while waiting for a close event to be dispatched.
};
} // namespace WebCore
#endif // MessagePort_h
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