Examples of org.jgroups.stack.Protocol

org.jgroups.stack.Protocol
The Protocol class provides a set of common services for protocol layers. Each layer has to be a subclass of Protocol and override a number of methods (typically just up(), Down and getName. Layers are stacked in a certain order to form a protocol stack. Events are passed from lower layers to upper ones and vice versa. E.g. a Message received by the UDP layer at the bottom will be passed to its higher layer as an Event. That layer will in turn pass the Event to its layer and so on, until a layer handles the Message and sends a response or discards it, the former resulting in another Event being passed down the stack.
Each layer has 2 FIFO queues, one for up Events and one for down Events. When an Event is received by a layer (calling the internal upcall ReceiveUpEvent), it is placed in the up-queue where it will be retrieved by the up-handler thread which will invoke method Up of the layer. The same applies for Events traveling down the stack. Handling of the up-handler and down-handler threads and the 2 FIFO queues is donw by the Protocol class, subclasses will almost never have to override this behavior.
The important thing to bear in mind is that Events have to passed on between layers in FIFO order which is guaranteed by the Protocol implementation and must be guranteed by subclasses implementing their on Event queuing.
Note that each class implementing interface Protocol MUST provide an empty, public constructor !

        if(timer == null)
            timer=new TimeScheduler2();
        nak.setTimer(timer);
        System.out.println("timer is a " + timer.getClass());


        nak.setDownProtocol(new Protocol() {public Object down(Event evt) {return null;}});


        nak.setUpProtocol(new Protocol() {
            public Object up(Event evt) {
                if(evt.getType() == Event.MSG) {
                    delivered_msgs.incrementAndGet();
                    NakAckHeader hdr=(NakAckHeader)((Message)evt.getArg()).getHeader(NAKACK_ID);
                    if(hdr != null)

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        sendMessages(c2.getAddress(), true);
    }


    public void testOrderWithScopedMulticasts() throws Exception {
        ProtocolStack stack=c2.getProtocolStack();
        Protocol neighbor=stack.findProtocol(UNICAST.class, UNICAST2.class);
        SCOPE scope=new SCOPE();
        stack.insertProtocolInStack(scope, neighbor, ProtocolStack.ABOVE);
        scope.init();


        c1.connect("SCOPE_Test");

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    private void sendMessages(Address dest, boolean use_scopes) throws Exception {
        if(use_scopes) {
            ProtocolStack stack=c2.getProtocolStack();
            Protocol neighbor=stack.findProtocol(UNICAST.class, UNICAST2.class);
            SCOPE scope=new SCOPE();
            stack.insertProtocolInStack(scope, neighbor, ProtocolStack.ABOVE);
            scope.init();
        }

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    @BeforeMethod
    protected void setUp() throws Exception {
        c1=createChannel(true);
        c1.connect(GROUP);
        Protocol prot=c1.getProtocolStack().findProtocol(UNICAST.class, UNICAST2.class);
        if(prot instanceof UNICAST)
            cache=((UNICAST)prot).getAgeOutCache();
        else if(prot instanceof UNICAST2)
            cache=((UNICAST2)prot).getAgeOutCache();
        else

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        c1.setProtocolStack(stack);
        stack.addProtocol(new SHARED_LOOPBACK()).addProtocol(new MockProtocol1()).addProtocol(new MockProtocol2());
        stack.init();
        c1.connect("demo");


        Protocol transport=stack.getTransport();
        transport.up(new Event(Event.MSG, new Message(null, Util.createRandomAddress(), "hello world")));
        assert receiver.getNumMsgsReceived() == 1;
    }

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        MyReceiver receiver=new MyReceiver();
        c2.setReceiver(receiver);


        // the first channel will discard the unicast messages with seqno #3 two times, the let them pass down
        ProtocolStack stack=c1.getProtocolStack();
        Protocol neighbor=stack.findProtocol(UNICAST.class, UNICAST2.class);
        System.out.println("Found unicast protocol " + neighbor.getClass().getSimpleName());
        stack.insertProtocolInStack(prot1, neighbor, ProtocolStack.BELOW);


        c1.connect("UNICAST_OOB_Test");
        c2.connect("UNICAST_OOB_Test");
        assert c2.getView().size() == 2 : "ch2.view is " + c2.getView();

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        }
    }


    private static void modifyStack(JChannel ch) {
        ProtocolStack stack=ch.getProtocolStack();
        Protocol prot=stack.findProtocol(MERGE2.class);
        if(prot != null) {
            MERGE2 merge=(MERGE2)prot;
            merge.setMinInterval(3000);
            merge.setMaxInterval(5000);
        }

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        else if(transport instanceof BasicTCP) {
            List<Short> ports=ResourceManager.getNextTcpPorts(bind_addr, num);
            transport.setBindPort(ports.get(0));
            transport.setPortRange(num);


            Protocol ping=stack.findProtocol(TCPPING.class);
            if(ping == null)
                throw new IllegalStateException("TCP stack must consist of TCP:TCPPING - other config are not supported");


            List<String> initial_hosts=new LinkedList<String>();
            for(short port: ports) {

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            this.stack = channel.getProtocolStack();
            Iterator iter = stack.getProtocols().iterator();
            String debugLevels [] = new String[]{"DEBUG","INFO","ERROR"};
            while (iter.hasNext())
            {
                Protocol p = (Protocol) iter.next();
                JLabel field = new JLabel(p.getName());
                JComboBox pane = new JComboBox(debugLevels);
                this.add(field);
                this.add(pane);


            }

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    }


    public void init() throws Exception {
        super.init();
        if(start_port <= 0) {
            Protocol dynamic_discovery_prot=stack.findProtocol("MPING");
            if(dynamic_discovery_prot == null)
                dynamic_discovery_prot=stack.findProtocol("TCPGOSSIP");


            if(dynamic_discovery_prot != null) {
                if(log.isInfoEnabled())

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