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 !

        stack.insertProtocol(discard, ProtocolStack.ABOVE, transport.getName());
    }
    
    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();
            mping.setProperties(new Properties());
            mping.setProtocolStack(ch.getProtocolStack());
            stack.insertProtocol(mping, ProtocolStack.ABOVE, transport.getName());
            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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            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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    }


    void runServer() throws Exception {
        System.setProperty("jgroups.bind_addr", host);
        if(port > 0) {
            Protocol transport=ch.getProtocolStack().getTransport();
            if(transport instanceof TP) {
                ((TP)transport).setBindPort(port);
            }
        }
        ch.connect(null); // this makes it a unicast channel

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            e.printStackTrace();
        }


        if(protStack.length > 1) {
            for(int i=0; i < protStack.length; i++) {
                Protocol p1=protStack[i];
                p1.setProtocolStack(prot_stack);
                Protocol p2=i+1 >= protStack.length? null : protStack[i+1];
                if(p2 != null) {
                    p1.setDownProtocol(p2);
                    p2.setUpProtocol(p1);
                }
            }
        }
    }

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    }


    public String dumpStats() {
        StringBuilder sb=new StringBuilder();
        for(int i=0; i < protStack.length; i++) {
            Protocol p1=protStack[i];
            sb.append(p1.getName()).append(":\n").append(p1.dumpStats()).append("\n");
        }
        return sb.toString();
    }

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            bottom.up(view_evt);
            top.down(view_evt);
        }


        for(int i=0; i < protStack.length; i++) {
            Protocol p=protStack[i];
            p.setProtocolStack(prot_stack);
        }


        for(int i=0; i < protStack.length; i++) {
            Protocol p=protStack[i];
            p.init();
        }


        for(int i=0; i < protStack.length; i++) {
            Protocol p=protStack[i];
            p.start();
        }




        send_thread=new Thread() {
            public void run() {

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        // top.setUpProtocol(harness);
    }


    public Vector<Protocol> getProtocols() {
        Vector<Protocol> retval=new Vector<Protocol>();
        Protocol tmp=top;
        while(tmp != null) {
            retval.add(tmp);
            tmp=tmp.getDownProtocol();
        }
        return retval;
    }

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    public Protocol getTop() {
        return top;
    }


    public void start() throws Exception {
        Protocol p;
        if(harness != null) {
            p=harness;
            while(p != null) {
                p.start();
                p=p.getDownProtocol();
            }
        }
        else if(top != null) {
            p=top;
            while(p != null) {
                p.start();
                p=p.getDownProtocol();
            }
        }
    }

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            }
        }
    }


    public void stop() {
        Protocol p;
        if(harness != null) {
            List<Protocol> protocols=new LinkedList<Protocol>();
            p=harness;
            while(p != null) {
                protocols.add(p);
                p.stop();
                p=p.getDownProtocol();
            }
            Configurator.destroyProtocolStack(protocols);
        }
        else if(top != null) {
            p=top;
            List<Protocol> protocols=new LinkedList<Protocol>();
            while(p != null) {
                protocols.add(p);
                p.stop();
                p=p.getDownProtocol();
            }
            Configurator.destroyProtocolStack(protocols);
        }
    }

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        }
    }




    private final Protocol getBottomProtocol(Protocol top) {
        Protocol tmp;


        if(top == null)
            return null;


        tmp=top;
        while(tmp.getDownProtocol() != null)
            tmp=tmp.getDownProtocol();
        return tmp;
    }

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