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 !

                           "[-size <msg size (in bytes)]");
    }


    void start(String props, int num_msgs, int size) throws Exception {
        Message msg;
        Protocol transport;
        byte[] buf=new byte[size];
        Address local_addr;
        NakAckHeader hdr;


        ch=new JChannel(props);
        ch.connect("demo");
        local_addr=ch.getLocalAddress();
        Vector members=new Vector();
        members.add(local_addr);
        view=new View(local_addr, 0, members);
        ch.down(new Event(Event.BECOME_SERVER));
        ch.down(new Event(Event.VIEW_CHANGE, view));
        tp=PERF_TP.getInstance();


        Vector protocols=ch.getProtocolStack().getProtocols();
        transport=(Protocol)protocols.lastElement();




        System.out.println("sending " + num_msgs + " up the stack");


        tp.setExpectedMessages(num_msgs); // this starts the time
        for(int i=0; i < num_msgs; i++) {
            msg=new Message(null, local_addr, buf);
            hdr=new NakAckHeader(NakAckHeader.MSG, i);
            msg.putHeader("NAKACK", hdr);
            transport.up(new Event(Event.MSG, msg));
            if(i % 10000 == 0) {
                System.out.println("passed up " + i + " messages");
            }
        }
        synchronized(tp) {

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    }


    private static void disableBundling(JChannel ch) {
        System.out.println("Disabling message bundling (as this would increase latency)");
        ProtocolStack stack=ch.getProtocolStack();
        Protocol transport=stack.getTransport();
        Properties props=new Properties();
        props.setProperty("enable_bundling", "false");
        transport.setProperties(props);
    }

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            return;
        }


        String ch_name=hdr.channel_name;
        if(singleton_name != null) {
            Protocol tmp_prot=up_prots.get(ch_name);
            if(tmp_prot != null) {
                Event evt=new Event(Event.MSG, msg);
                if(log.isTraceEnabled()) {
                    StringBuilder sb=new StringBuilder("message is ").append(msg).append(", headers are ").append(msg.printHeaders());
                    log.trace(sb);
                }
                tmp_prot.up(evt);
            }
            else {
                // we discard messages for a group we don't have. If we had a scenario with channel C1 and A,B on it,
                // and channel C2 and only A on it (asymmetric setup), then C2 would always log warnings that B was
                // not found (Jan 25 2008 (bela))

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        else {
            for(Map.Entry<String,Protocol> entry: up_prots.entrySet()) {
                String tmp=entry.getKey();
                if(tmp.startsWith(Global.DUMMY))
                    continue;
                Protocol prot=entry.getValue();
                prot.up(new Event(Event.SET_LOCAL_ADDRESS, local_addr));
            }
        }
    }

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                           "[-size <msg size (in bytes)] [-file_name <filename>] [-write] [-read]");
    }


    void start(String props, int num_msgs, int size, String file_name, boolean write) throws Exception {
        Message msg;
        Protocol transport;
        byte[] buf=new byte[size];
        Address local_addr;
        View    view;


        if(file_name != null) {
            if(write)
                out=new DataOutputStream(new FileOutputStream(file_name));
            else
                in=new DataInputStream(new FileInputStream(file_name));
        }


        ch=new JChannel(props);
        ch.setReceiver(new ExtendedReceiverAdapter());
        ch.connect("demo");
        tp=PERF_TP.getInstance();
        local_addr=ch.getLocalAddress();
        Vector members=new Vector();
        members.add(local_addr);
        view=new View(local_addr, 0, members);
        ch.down(new Event(Event.BECOME_SERVER));
        ch.down(new Event(Event.VIEW_CHANGE, view));


        if(write) {
            tp.setExpectedMessages(num_msgs);
            for(int i=0; i < num_msgs; i++) {
                msg=new Message(null, local_addr, buf);
                ch.send(msg);
                if(out != null)
                    msg.writeTo(out);
                if(i % 1000 == 0)
                    System.out.println("sent " + i + " messages");
            }
        }
        else {
            List msgs=new LinkedList();
            Vector protocols=ch.getProtocolStack().getProtocols();
            transport=(Protocol)protocols.lastElement();
            int i=0;
            while(true) {
                msg=new Message();
                try {
                    msg.readFrom(in);
                    msgs.add(msg);
                }
                catch(EOFException eof) {
                    break;
                }
            }


            num_msgs=msgs.size();
            System.out.println("read " + num_msgs + " msgs from file");
            tp.setExpectedMessages(msgs.size()); // this starts the time
            for(Iterator it=msgs.iterator(); it.hasNext();) {
                msg=(Message)it.next();
                i++;
                transport.up(new Event(Event.MSG, msg));
                if(i % 10000 == 0) {
                    System.out.println("passed up " + i + " messages");
                }
            }
        }

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            return;
        }


        String ch_name=hdr.channel_name;
        if(singleton_name != null) {
            Protocol tmp_prot=up_prots.get(ch_name);
            if(tmp_prot != null) {
                Event evt=new Event(Event.MSG, msg);
                if(log.isTraceEnabled()) {
                    StringBuilder sb=new StringBuilder("message is ").append(msg).append(", headers are ").append(msg.printHeaders());
                    log.trace(sb);
                }
                tmp_prot.up(evt);
            }
            else {
                // we discard messages for a group we don't have. If we had a scenario with channel C1 and A,B on it,
                // and channel C2 and only A on it (asymmetric setup), then C2 would always log warnings that B was
                // not found (Jan 25 2008 (bela))

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        else {
            for(Map.Entry<String,Protocol> entry: up_prots.entrySet()) {
                String tmp=entry.getKey();
                if(tmp.startsWith(Global.DUMMY))
                    continue;
                Protocol prot=entry.getValue();
                prot.up(new Event(Event.SET_LOCAL_ADDRESS, local_addr));
            }
        }
    }

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        v=new View(a1, 1, members);
        s=new Simulator();
        s.setLocalAddress(a1);
        s.setView(v);
        s.addMember(a1);
        Protocol frag=createProtocol();
        System.out.println("protocol to be tested: " + frag);
        Properties props=new Properties();
        props.setProperty("frag_size", "512");
        frag.setPropertiesInternal(props);
        Protocol[] stack=new Protocol[]{frag};
        s.setProtocolStack(stack);
        s.start();
    }

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    }
    
    protected JChannel createChannel() throws ChannelException {
        JChannel ret = new JChannel(CHANNEL_CONFIG);
        ret.setOpt(Channel.BLOCK, Boolean.TRUE);
        Protocol flush = ret.getProtocolStack().findProtocol("FLUSH");
        if(flush != null){
            Properties p = new Properties();
            p.setProperty("timeout", "0");
            flush.setProperties(p);


            // send timeout up and down the stack, so other protocols can use
            // the same value too
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("flush_timeout", new Long(0));
            flush.getUpProtocol().up(new Event(Event.CONFIG, map));
            flush.getDownProtocol().down(new Event(Event.CONFIG, map));
        }
        return ret;
    }

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        System.out.println(">> rsps:\n" + rsps);
        assertEquals(2, rsps.size());


        ProtocolStack stack=c1.getProtocolStack();
        stack.removeProtocol("VERIFY_SUSPECT");
        Protocol transport=stack.getTransport();
        System.out.println(">> suspecting C2:");
        transport.up(new Event(Event.SUSPECT, c2.getLocalAddress()));


        System.out.println(">> shunning C2:");
        
        //always up EXIT on underlying JChannel as that is what happens
        //in real scenarios

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