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      1 /*
      2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     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,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  *
     25  */
     26 
     27 #ifndef MessagePort_h
     28 #define MessagePort_h
     29 
     30 #include "bindings/v8/ScriptWrappable.h"
     31 #include "core/dom/ActiveDOMObject.h"
     32 #include "core/events/EventListener.h"
     33 #include "core/events/EventTarget.h"
     34 #include "public/platform/WebMessagePortChannel.h"
     35 #include "public/platform/WebMessagePortChannelClient.h"
     36 #include "wtf/OwnPtr.h"
     37 #include "wtf/PassOwnPtr.h"
     38 #include "wtf/PassRefPtr.h"
     39 #include "wtf/RefCounted.h"
     40 #include "wtf/RefPtr.h"
     41 #include "wtf/Vector.h"
     42 #include "wtf/WeakPtr.h"
     43 
     44 namespace WebCore {
     45 
     46 class Event;
     47 class ExceptionState;
     48 class Frame;
     49 class MessagePort;
     50 class ExecutionContext;
     51 class SerializedScriptValue;
     52 
     53 // The overwhelmingly common case is sending a single port, so handle that efficiently with an inline buffer of size 1.
     54 typedef Vector<RefPtr<MessagePort>, 1> MessagePortArray;
     55 
     56 // Not to be confused with blink::WebMessagePortChannelArray; this one uses Vector and OwnPtr instead of WebVector and raw pointers.
     57 typedef Vector<OwnPtr<blink::WebMessagePortChannel>, 1> MessagePortChannelArray;
     58 
     59 class MessagePort : public RefCounted<MessagePort>
     60     , public ActiveDOMObject
     61     , public EventTargetWithInlineData
     62     , public ScriptWrappable
     63     , public blink::WebMessagePortChannelClient {
     64     REFCOUNTED_EVENT_TARGET(MessagePort);
     65 public:
     66     static PassRefPtr<MessagePort> create(ExecutionContext&);
     67     virtual ~MessagePort();
     68 
     69     void postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionState&);
     70 
     71     void start();
     72     void close();
     73 
     74     void entangle(PassOwnPtr<blink::WebMessagePortChannel>);
     75     PassOwnPtr<blink::WebMessagePortChannel> disentangle();
     76 
     77     // Returns 0 if there is an exception, or if the passed-in array is 0/empty.
     78     static PassOwnPtr<MessagePortChannelArray> disentanglePorts(const MessagePortArray*, ExceptionState&);
     79 
     80     // Returns 0 if the passed array is 0/empty.
     81     static PassOwnPtr<MessagePortArray> entanglePorts(ExecutionContext&, PassOwnPtr<MessagePortChannelArray>);
     82 
     83     bool started() const { return m_started; }
     84 
     85     virtual const AtomicString& interfaceName() const OVERRIDE;
     86     virtual ExecutionContext* executionContext() const OVERRIDE { return ActiveDOMObject::executionContext(); }
     87     MessagePort* toMessagePort() OVERRIDE { return this; }
     88 
     89     // ActiveDOMObject implementation.
     90     virtual bool hasPendingActivity() const OVERRIDE;
     91     virtual void stop() OVERRIDE { close(); }
     92 
     93     void setOnmessage(PassRefPtr<EventListener> listener, DOMWrapperWorld* world)
     94     {
     95         setAttributeEventListener(EventTypeNames::message, listener, world);
     96         start();
     97     }
     98     EventListener* onmessage(DOMWrapperWorld* world) { return getAttributeEventListener(EventTypeNames::message, world); }
     99 
    100     // A port starts out its life entangled, and remains entangled until it is closed or is cloned.
    101     bool isEntangled() const { return !m_closed && !isNeutered(); }
    102 
    103     // A port gets neutered when it is transferred to a new owner via postMessage().
    104     bool isNeutered() const { return !m_entangledChannel; }
    105 
    106 private:
    107     explicit MessagePort(ExecutionContext&);
    108 
    109     // WebMessagePortChannelClient implementation.
    110     virtual void messageAvailable() OVERRIDE;
    111     void dispatchMessages();
    112 
    113     OwnPtr<blink::WebMessagePortChannel> m_entangledChannel;
    114 
    115     bool m_started;
    116     bool m_closed;
    117 
    118     WeakPtrFactory<MessagePort> m_weakFactory;
    119 };
    120 
    121 } // namespace WebCore
    122 
    123 #endif // MessagePort_h
    124