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 !

        }
    }
    
    private static void replaceDiscoveryProtocol(JChannel ch) throws Exception {
        ProtocolStack stack=ch.getProtocolStack();
        Protocol discovery=stack.removeProtocol("TCPPING");
        if(discovery != null){
            Protocol transport = stack.getTransport();
            MPING mping=new MPING();
            InetAddress bindAddress=Util.getBindAddress(new Properties());
            mping.setBindAddr(bindAddress);
            mping.setMulticastAddress("230.1.2.3");
            mping.setMcastPort(8888);            
            stack.insertProtocol(mping, ProtocolStack.ABOVE, transport.getName());
            mping.setProtocolStack(ch.getProtocolStack());
            mping.init();
            mping.start();            
            System.out.println("Replaced TCPPING with MPING. See http://wiki.jboss.org/wiki/Wiki.jsp?page=JGroupsMERGE2");            
        }

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        final Condition all_msgs_delivered=lock.newCondition();
        final ConcurrentLinkedQueue<Long> delivered_msg_list=new ConcurrentLinkedQueue<Long>();
        final Address local_addr=Util.createRandomAddress("A");
        final Address sender=Util.createRandomAddress("B");


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


        unicast.setUpProtocol(new Protocol() {
            public Object up(Event evt) {
                if(evt.getType() == Event.MSG) {
                    delivered_msgs.incrementAndGet();
                    UNICAST.UnicastHeader hdr=(UNICAST.UnicastHeader)((Message)evt.getArg()).getHeader(UNICAST_ID);
                    if(hdr != null)

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    }


    
    public void testRemovalOfTop() throws Exception {
        stack.setup(Configurator.parseConfigurations(props));
        Protocol prot=stack.removeProtocol("FC");
        assert prot != null;
        List<Protocol> protocols=stack.getProtocols();
        Assert.assertEquals(5, protocols.size());
        assert protocols.get(0).getName().endsWith("UNICAST");
        assert  stack.getTopProtocol().getUpProtocol() != null;

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        assert  stack.getTopProtocol().getDownProtocol().getDownProtocol() != null;
    }
    
    public void testRemovalOfBottom() throws Exception {
        stack.setup(Configurator.parseConfigurations(props));
        Protocol prot=stack.removeProtocol("UDP");
        assert prot != null;
        List<Protocol> protocols=stack.getProtocols();
        Assert.assertEquals(5, protocols.size());
        assert protocols.get(protocols.size() -1).getName().endsWith("PING");
    }

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        assert protocols.get(protocols.size() -1).getName().endsWith("PING");
    }
    
    public void testAddingAboveTop() throws Exception{
        stack.setup(Configurator.parseConfigurations(props));
        Protocol new_prot=(Protocol)Class.forName("org.jgroups.protocols.TRACE").newInstance();
        stack.insertProtocol(new_prot, ProtocolStack.ABOVE, "FC");
        List<Protocol> protocols=stack.getProtocols();
        Assert.assertEquals(7, protocols.size());       
        assert protocols.get(0).getName().endsWith("TRACE");
        assert  stack.getTopProtocol().getUpProtocol() != null;

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    }
    
    @Test(expectedExceptions={IllegalArgumentException.class})
    public void testAddingBelowBottom() throws Exception{
        stack.setup(Configurator.parseConfigurations(props));           
        Protocol new_prot=(Protocol)Class.forName("org.jgroups.protocols.TRACE").newInstance();
        stack.insertProtocol(new_prot, ProtocolStack.BELOW, "UDP");        
    }

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        assert protocols != null;
        Assert.assertEquals(6, protocols.size());


        for(int i=0; i < names.length; i++) {
            String name=names[i];
            Protocol p=protocols.get(i);
            Assert.assertEquals(name, p.getName());
        }


        // insert below
        Protocol new_prot=(Protocol)Class.forName("org.jgroups.protocols.TRACE").newInstance();
        stack.insertProtocol(new_prot, ProtocolStack.BELOW, "UNICAST");
        protocols=stack.getProtocols();
        Assert.assertEquals(7, protocols.size());
        for(int i=0; i < below.length; i++) {
            String name=below[i];
            Protocol p=protocols.get(i);
            Assert.assertEquals(name, p.getName());
        }


        // remove
        Protocol prot=stack.removeProtocol("TRACE");
        assert prot != null;
        protocols=stack.getProtocols();
        Assert.assertEquals(6, protocols.size());
        for(int i=0; i < names.length; i++) {
            String name=names[i];
            Protocol p=protocols.get(i);
            Assert.assertEquals(name, p.getName());
        }


        // insert above
        new_prot=(Protocol)Class.forName("org.jgroups.protocols.TRACE").newInstance();
        stack.insertProtocol(new_prot, ProtocolStack.ABOVE, "UNICAST");
        protocols=stack.getProtocols();
        Assert.assertEquals(7, protocols.size());
        for(int i=0; i < above.length; i++) {
            String name=above[i];
            Protocol p=protocols.get(i);
            Assert.assertEquals(name, p.getName());
        }
    }

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        if(log.isTraceEnabled())
            log.trace(new StringBuilder("received ").append(msg).append(", headers are ").append(msg.printHeaders()));


        String ch_name=hdr.channel_name;


        final Protocol tmp_prot=isSingleton()? up_prots.get(ch_name) : up_prot;
        if(tmp_prot != null) {
            boolean is_protocol_adapter=tmp_prot instanceof ProtocolAdapter;
            // Discard if message's cluster name is not the same as our cluster name
            if(!is_protocol_adapter && perform_cluster_name_matching && channel_name != null && !channel_name.equals(ch_name)) {
                if(log.isWarnEnabled() && log_discard_msgs)
                    log.warn(new StringBuilder("discarded message from different cluster \"").append(ch_name).
                            append("\" (our cluster is \"").append(channel_name).append("\"). Sender was ").append(msg.getSrc()).toString());
                return;
            }


            if(loopback && multicast && discard_own_mcast) {
                Address local=is_protocol_adapter? ((ProtocolAdapter)tmp_prot).getAddress() : local_addr;
                if(local != null && local.equals(msg.getSrc()))
                    return;
            }
            tmp_prot.up(new Event(Event.MSG, msg));
        }
    }

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




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


        unicast.setUpProtocol(new Protocol() {
            public Object up(Event evt) {
                if(evt.getType() == Event.MSG) {
                    delivered_msgs.incrementAndGet();
                    UNICAST2.Unicast2Header hdr=(UNICAST2.Unicast2Header)((Message)evt.getArg()).getHeader(UNICAST_ID);
                    if(hdr != null)

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            makeUnique(channel, num, str);
        }


        protected void makeUnique(Channel channel, int num, String mcast_address) throws Exception {
            ProtocolStack stack = channel.getProtocolStack();
            Protocol transport = stack.getTransport();


            if (transport instanceof UDP) {
                short mcast_port = ResourceManager.getNextMulticastPort(InetAddress.getByName(bind_addr));
                ((UDP) transport).setMulticastPort(mcast_port);
                if (mcast_address != null) {
                    ((UDP) transport).setMulticastAddress(InetAddress.getByName(mcast_address));
                } else {
                    String mcast_addr = ResourceManager.getNextMulticastAddress();
                    ((UDP) transport).setMulticastAddress(InetAddress.getByName(mcast_addr));
                }
            } else if (transport instanceof BasicTCP) {
                List<Short> ports = ResourceManager.getNextTcpPorts(InetAddress.getByName(bind_addr), num);
                ((TP) transport).setBindPort(ports.get(0));
                ((TP) 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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