Examples of org.cometd.bayeux.server.BayeuxServer$Extension

org.cometd.bayeux.server.BayeuxServer

Extension API for {@link BayeuxServer}.

Implementations of this interface allow to modify incoming and outgoing messages respectively just before and just after they are handled by the implementation, either on client side or server side.

Extensions are be registered in order and one extension may allow subsequent extensions to process the message by returning true from the callback method, or forbid further processing by returning false.
@see BayeuxServer#addExtension(Extension)

        data.put(Info.NAME_FIELD, getName());
        data.put(Info.OBJECT_FIELD, serialize(newObject));


        if (logger.isDebugEnabled())
            logger.debug("Sharing {}", data);
        BayeuxServer bayeuxServer = oort.getBayeuxServer();
        bayeuxServer.getChannel(getChannelName()).publish(getLocalSession(), data);


        return data.getResult();
    }

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        assertNotNull(service);
        Seti seti = service.seti;
        assertNotNull(seti);
        Oort oort = seti.getOort();
        assertNotNull(oort);
        BayeuxServer bayeux = oort.getBayeuxServer();
        assertNotNull(bayeux);


        SecurityPolicy policy = bayeux.getSecurityPolicy();
        assertNotNull(policy);
        assertTrue(policy instanceof OortSecurityPolicy);


        server.stop();
    }

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    {
        super.init(config);


        ServletContext context = config.getServletContext();


        BayeuxServer bayeux = (BayeuxServer)context.getAttribute(BayeuxServer.ATTRIBUTE);
        Oort oort = (Oort)context.getAttribute(Oort.OORT_ATTRIBUTE);
        Seti seti = (Seti)context.getAttribute(Seti.SETI_ATTRIBUTE);


        _processor = new ServerAnnotationProcessor(bayeux, oort, seti);
        _service = new OortChatService();
        _processor.process(_service);


        bayeux.addExtension(new TimesyncExtension());
    }

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    @Test
    public void testObserveNonStartedOortAndDetectStart() throws Exception
    {
        Server server1 = startServer(0);
        String url = (String)server1.getAttribute(OortConfigServlet.OORT_URL_PARAM);
        final BayeuxServer bayeuxServer = (BayeuxServer)server1.getAttribute(BayeuxServer.ATTRIBUTE);
        Oort oort1 = new Oort(bayeuxServer, url);
        oort1.start();


        Server server2 = startServer(0);
        String url2 = (String)server2.getAttribute(OortConfigServlet.OORT_URL_PARAM);

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        Oort oortA = startOort(serverA);
        stopOort(oortA);
        oortA.setAckExtensionEnabled(true);
        oortA.start();


        BayeuxServer bayeuxServerA = oortA.getBayeuxServer();
        int ackExtensions = 0;
        for (BayeuxServer.Extension extension : bayeuxServerA.getExtensions())
            if (extension instanceof AcknowledgedMessagesExtension)
                ++ackExtensions;
        Assert.assertEquals(1, ackExtensions);


        Server serverB = startServer(0);
        BayeuxServer bayeuxServerB = (BayeuxServer)serverB.getAttribute(BayeuxServer.ATTRIBUTE);
        bayeuxServerB.addExtension(new AcknowledgedMessagesExtension());
        Oort oortB = startOort(serverB);
        stopOort(oortB);
        oortB.setAckExtensionEnabled(true);
        oortB.start();


        ackExtensions = 0;
        for (BayeuxServer.Extension extension : bayeuxServerB.getExtensions())
            if (extension instanceof AcknowledgedMessagesExtension)
                ++ackExtensions;
        Assert.assertEquals(1, ackExtensions);


        CountDownLatch latch1 = new CountDownLatch(2);

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    @Test
    public void testPublishDuringCometJoined() throws Exception
    {
        Server serverA = startServer(0);
        final Oort oortA = startOort(serverA);
        final BayeuxServer bayeuxServerA = oortA.getBayeuxServer();


        final LocalSession serviceA = bayeuxServerA.newLocalSession("test");
        serviceA.handshake();
        final String channelName = "/test";
        final String data = "data";
        final CountDownLatch joinedLatch = new CountDownLatch(1);
        oortA.addCometListener(new Oort.CometListener.Adapter()
        {
            public void cometJoined(Event event)
            {
                bayeuxServerA.createChannelIfAbsent(channelName).getReference().publish(serviceA, data);
                joinedLatch.countDown();
            }
        });
        oortA.observeChannel(channelName);


        Server serverB = startServer(0);
        Oort oortB = startOort(serverB);
        oortB.observeChannel(channelName);


        BayeuxServer bayeuxServerB = oortB.getBayeuxServer();
        final CountDownLatch latch = new CountDownLatch(1);
        bayeuxServerB.createChannelIfAbsent(channelName).getReference().addListener(new ServerChannel.MessageListener()
        {
            public boolean onMessage(ServerSession from, ServerChannel channel, ServerMessage.Mutable message)
            {
                if (data.equals(message.getData()))
                    latch.countDown();

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        ServletHolder demo = context.addServlet(CometDDemoServlet.class, "/demo");
        demo.setInitOrder(3);


        server.start();


        BayeuxServer bayeux = cometdServlet.getBayeux();
        bayeux.setSecurityPolicy(new DefaultSecurityPolicy());


        // Demo lazy messages
        if (Boolean.getBoolean("LAZY"))
        {
            bayeux.addExtension(new BayeuxServer.Extension.Adapter()
            {
                @Override
                public boolean rcv(ServerSession from, Mutable message)
                {
                    if (message.getChannel().startsWith("/chat/") && !message.isPublishReply() && message.getData().toString().contains("lazy"))
                        message.setLazy(true);
                    return true;
                }
            });
        }


        // Demo lazy messages
        if (Boolean.getBoolean("LAZYCHAT"))
        {
            String channelName = "/chat/demo";
            final ServerChannel chat_demo = bayeux.createChannelIfAbsent(channelName).getReference();
            chat_demo.setLazy(true);
            chat_demo.setPersistent(true);
        }
    }

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        data.put(Info.TYPE_FIELD, TYPE_FIELD_ELEMENT_VALUE);
        data.put(Info.ACTION_FIELD, ACTION_FIELD_ADD_VALUE);


        if (logger.isDebugEnabled())
            logger.debug("Sharing list add {}", data);
        BayeuxServer bayeuxServer = getOort().getBayeuxServer();
        bayeuxServer.getChannel(getChannelName()).publish(getLocalSession(), data);


        return data.getResult();
    }

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        data.put(Info.TYPE_FIELD, TYPE_FIELD_ELEMENT_VALUE);
        data.put(Info.ACTION_FIELD, ACTION_FIELD_REMOVE_VALUE);


        if (logger.isDebugEnabled())
            logger.debug("Sharing list remove {}", data);
        BayeuxServer bayeuxServer = getOort().getBayeuxServer();
        bayeuxServer.getChannel(getChannelName()).publish(getLocalSession(), data);


        return data.getResult();
    }

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        data.put(Info.TYPE_FIELD, TYPE_FIELD_ENTRY_VALUE);
        data.put(Info.ACTION_FIELD, ACTION_FIELD_PUT_VALUE);


        if (logger.isDebugEnabled())
            logger.debug("Sharing map put {}", data);
        BayeuxServer bayeuxServer = getOort().getBayeuxServer();
        bayeuxServer.getChannel(getChannelName()).publish(getLocalSession(), data);


        return data.getResult();
    }

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