Examples of org.jgroups.stack.ProtocolStack

org.jgroups.stack.ProtocolStack
A ProtocolStack manages a number of protocols layered above each other. It creates all protocol classes, initializes them and, when ready, starts all of them, beginning with the bottom most protocol. It also dispatches messages received from the stack to registered objects (e.g. channel, GMP) and sends messages sent by those objects down the stack.
The ProtocolStack makes use of the Configurator to setup and initialize stacks, and to destroy them again when not needed anymore @author Bela Ban

     */
    public static void shutdown(Channel ch) throws Exception {
        DISCARD discard=new DISCARD();
        discard.setLocalAddress(ch.getAddress());
        discard.setDiscardAll(true);
        ProtocolStack stack=ch.getProtocolStack();
        TP transport=stack.getTransport();
        stack.insertProtocol(discard,ProtocolStack.ABOVE,transport.getClass());


        //abruptly shutdown FD_SOCK just as in real life when member gets killed non gracefully
        FD_SOCK fd=(FD_SOCK)ch.getProtocolStack().findProtocol(FD_SOCK.class);
        if(fd != null)
            fd.stopServerSocket(false);


        View view=ch.getView();
        if(view != null) {
            ViewId vid=view.getViewId();
            List<Address> members=Arrays.asList(ch.getAddress());


            ViewId new_vid=new ViewId(ch.getAddress(),vid.getId() + 1);
            View new_view=new View(new_vid,members);


            // inject view in which the shut down member is the only element
            GMS gms=(GMS)stack.findProtocol(GMS.class);
            gms.installView(new_view);
        }
        Util.close(ch);
    }

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    }




    public static JChannel createChannel(Protocol... prots) throws Exception {
        JChannel ch=new JChannel(false);
        ProtocolStack stack=new ProtocolStack();
        ch.setProtocolStack(stack);
        for(Protocol prot : prots) {
            stack.addProtocol(prot);
            prot.setProtocolStack(stack);
        }
        stack.init();
        return ch;
    }

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        for(Map.Entry<String,List<ProtocolConfiguration>> entry: protocols.entrySet()) {
            String fork_stack_id=entry.getKey();
            if(get(fork_stack_id) != null && !replace_existing)
                continue;


            ProtocolStack  fork_prot_stack=new ForkProtocolStack();
            List<Protocol> prots=createProtocols(fork_prot_stack,entry.getValue());
            createForkStack(fork_stack_id, fork_prot_stack, replace_existing, prots);
        }
    }

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     * the MBean server
     * @param channel
     * @param prefix
     */
    public static void registerProtocols(MBeanServer server, org.jgroups.JChannel channel, String prefix) throws Exception {
        ProtocolStack stack=channel.getProtocolStack();
        Vector protocols=stack.getProtocols();
        org.jgroups.stack.Protocol prot;
        org.jgroups.jmx.Protocol p=null;
        for(int i=0; i < protocols.size(); i++) {
            prot=(org.jgroups.stack.Protocol)protocols.get(i);
            try {

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            server.registerMBean(p, prot_name);
        }
    }


    public static void unregisterProtocols(MBeanServer server, org.jgroups.JChannel channel, String channel_name) {
        ProtocolStack stack=channel.getProtocolStack();
        Vector protocols=stack.getProtocols();
        org.jgroups.stack.Protocol prot;
        ObjectName prot_name=null;
        for(int i=0; i < protocols.size(); i++) {
            prot=(org.jgroups.stack.Protocol)protocols.get(i);
            try {

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    /**
     * Returns a pretty-printed form of all the protocols. If include_properties
     * is set, the properties for each protocol will also be printed.
     */
    public String printProtocolSpec(boolean include_properties) {
        ProtocolStack ps=getProtocolStack();
        return ps != null? ps.printProtocolSpec(include_properties) : null;
    }

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        try {
            mq.reset();


            // new stack is created on open() - bela June 12 2003
            prot_stack=new ProtocolStack(this, props);
            prot_stack.setup();
            closed=false;
        }
        catch(Exception e) {
            throw new ChannelException("failed to open channel" , e);

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    protected final void init(ProtocolStackConfigurator configurator) throws ChannelException {
        if(log.isInfoEnabled())
            log.info("JGroups version: " + Version.description);
        ConfiguratorFactory.substituteVariables(configurator); // replace vars with system props
        props=configurator.getProtocolStackString();
        prot_stack=new ProtocolStack(this, props);
        try {
            prot_stack.setup(); // Setup protocol stack (creates protocol, calls init() on them)
        }
        catch(Throwable e) {
            throw new ChannelException("unable to setup the protocol stack: " + e.getMessage(), e);

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    }




    protected static FORK getFORK(Channel ch, int position, Class<? extends Protocol> neighbor,
                                  boolean create_fork_if_absent) throws Exception {
        ProtocolStack stack=ch.getProtocolStack();
        FORK fork=(FORK)stack.findProtocol(FORK.class);
        if(fork == null) {
            if(!create_fork_if_absent)
                throw new IllegalArgumentException("FORK not found in main stack");
            fork=new FORK();
            stack.insertProtocol(fork, position, neighbor);
        }
        return fork;
    }

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        return socket_factory;
    }


    public void setSocketFactory(SocketFactory factory) {
        socket_factory=factory;
        ProtocolStack stack=getProtocolStack();
        Protocol prot=stack != null? stack.getTopProtocol() : null;
        if(prot != null)
            prot.setSocketFactory(factory);
    }

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