2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
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5 * modification, are permitted provided that the following conditions
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13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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30 #include "EventListener.h"
31 #include "EventTarget.h"
32 #include "MessagePortChannel.h"
33 #include <wtf/Forward.h>
34 #include <wtf/OwnPtr.h>
35 #include <wtf/PassOwnPtr.h>
36 #include <wtf/PassRefPtr.h>
37 #include <wtf/RefPtr.h>
38 #include <wtf/Vector.h>
39 #include <wtf/text/AtomicStringHash.h>
46 class ScriptExecutionContext;
48 // The overwhelmingly common case is sending a single port, so handle that efficiently with an inline buffer of size 1.
49 typedef Vector<RefPtr<MessagePort>, 1> MessagePortArray;
51 // FIXME: This class should inherit from ActiveDOMObject and use
52 // setPendingActivity / unsetPendingActivity instead of duplicating
53 // ActiveDOMObject's features and relying on JavaScript garbage collection
54 // to get its lifetime right.
55 class MessagePort : public RefCounted<MessagePort>, public EventTarget {
57 static PassRefPtr<MessagePort> create(ScriptExecutionContext& scriptExecutionContext) { return adoptRef(new MessagePort(scriptExecutionContext)); }
60 void postMessage(PassRefPtr<SerializedScriptValue> message, ExceptionCode&);
61 void postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionCode&);
62 // FIXME: remove this when we update the ObjC bindings (bug #28774).
63 void postMessage(PassRefPtr<SerializedScriptValue> message, MessagePort*, ExceptionCode&);
68 void entangle(PassOwnPtr<MessagePortChannel>);
69 PassOwnPtr<MessagePortChannel> disentangle(ExceptionCode&);
71 // Disentangle an array of ports, returning the entangled channels.
72 // 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.
73 // Returns 0 if there is an exception, or if the passed-in array is 0/empty.
74 static PassOwnPtr<MessagePortChannelArray> disentanglePorts(const MessagePortArray*, ExceptionCode&);
76 // Entangles an array of channels, returning an array of MessagePorts in matching order.
77 // Returns 0 if the passed array is 0/empty.
78 static PassOwnPtr<MessagePortArray> entanglePorts(ScriptExecutionContext&, PassOwnPtr<MessagePortChannelArray>);
80 void messageAvailable();
81 bool started() const { return m_started; }
83 void contextDestroyed();
85 virtual ScriptExecutionContext* scriptExecutionContext() const;
87 virtual MessagePort* toMessagePort() { return this; }
89 void dispatchMessages();
91 using RefCounted<MessagePort>::ref;
92 using RefCounted<MessagePort>::deref;
94 bool hasPendingActivity();
96 void setOnmessage(PassRefPtr<EventListener> listener)
98 setAttributeEventListener(eventNames().messageEvent, listener);
101 EventListener* onmessage() { return getAttributeEventListener(eventNames().messageEvent); }
103 // Returns null if there is no entangled port, or if the entangled port is run by a different thread.
104 // Returns null otherwise.
105 // 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.
106 MessagePort* locallyEntangledPort();
107 // A port starts out its life entangled, and remains entangled until it is closed or is cloned.
108 bool isEntangled() { return !m_closed && !isCloned(); }
109 // A port is cloned if its entangled channel has been removed and sent to a new owner via postMessage().
110 bool isCloned() { return !m_entangledChannel; }
113 MessagePort(ScriptExecutionContext&);
115 virtual void refEventTarget() { ref(); }
116 virtual void derefEventTarget() { deref(); }
117 virtual EventTargetData* eventTargetData();
118 virtual EventTargetData* ensureEventTargetData();
120 OwnPtr<MessagePortChannel> m_entangledChannel;
125 ScriptExecutionContext* m_scriptExecutionContext;
126 EventTargetData m_eventTargetData;
129 } // namespace WebCore
131 #endif // MessagePort_h