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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 "EventNames.h"
#include "EventTarget.h"
#include "MessagePortChannel.h"
#include <wtf/HashMap.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
namespace WebCore {
class AtomicStringImpl;
class Event;
class Frame;
class MessagePort;
class ScriptExecutionContext;
class String;
// The overwhelmingly common case is sending a single port, so handle that efficiently with an inline buffer of size 1.
typedef Vector<RefPtr<MessagePort>, 1> MessagePortArray;
class MessagePort : public RefCounted<MessagePort>, public EventTarget {
public:
static PassRefPtr<MessagePort> create(ScriptExecutionContext& scriptExecutionContext) { return adoptRef(new MessagePort(scriptExecutionContext)); }
~MessagePort();
void postMessage(PassRefPtr<SerializedScriptValue> message, ExceptionCode&);
void postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionCode&);
// FIXME: remove this when we update the ObjC bindings (bug #28774).
void postMessage(PassRefPtr<SerializedScriptValue> message, MessagePort*, ExceptionCode&);
void start();
void close();
void entangle(PassOwnPtr<MessagePortChannel>);
PassOwnPtr<MessagePortChannel> disentangle(ExceptionCode&);
// Disentangle an array of ports, returning the entangled channels.
// Per section 8.3.3 of the HTML5 spec, generates an INVALID_STATE_ERR exception if any of the passed ports are null or not entangled.
// Returns 0 if there is an exception, or if the passed-in array is 0/empty.
static PassOwnPtr<MessagePortChannelArray> disentanglePorts(const MessagePortArray*, ExceptionCode&);
// Entangles an array of channels, returning an array of MessagePorts in matching order.
// Returns 0 if the passed array is 0/empty.
static PassOwnPtr<MessagePortArray> entanglePorts(ScriptExecutionContext&, PassOwnPtr<MessagePortChannelArray>);
void messageAvailable();
bool started() const { return m_started; }
void contextDestroyed();
virtual ScriptExecutionContext* scriptExecutionContext() const;
virtual MessagePort* toMessagePort() { return this; }
void dispatchMessages();
using RefCounted<MessagePort>::ref;
using RefCounted<MessagePort>::deref;
bool hasPendingActivity();
void setOnmessage(PassRefPtr<EventListener> listener)
{
setAttributeEventListener(eventNames().messageEvent, listener);
start();
}
EventListener* onmessage() { return getAttributeEventListener(eventNames().messageEvent); }
// Returns null if there is no entangled port, or if the entangled port is run by a different thread.
// Returns null otherwise.
// NOTE: 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();
// A port starts out its life entangled, and remains entangled until it is closed or is cloned.
bool isEntangled() { return !m_closed && !isCloned(); }
// A port is cloned if its entangled channel has been removed and sent to a new owner via postMessage().
bool isCloned() { return !m_entangledChannel; }
private:
MessagePort(ScriptExecutionContext&);
virtual void refEventTarget() { ref(); }
virtual void derefEventTarget() { deref(); }
virtual EventTargetData* eventTargetData();
virtual EventTargetData* ensureEventTargetData();
OwnPtr<MessagePortChannel> m_entangledChannel;
bool m_started;
bool m_closed;
ScriptExecutionContext* m_scriptExecutionContext;
EventTargetData m_eventTargetData;
};
} // namespace WebCore
#endif // MessagePort_h
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