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 !

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

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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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            return;
        }


        String ch_name=hdr.channel_name;
        if(isSingleton()) {
            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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        Util.checkBufferSize(getName() + ".recv_buf_size", recv_buf_size);
        Util.checkBufferSize(getName() + ".send_buf_size", send_buf_size);
       
        if(!isSingleton() && bind_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.isDebugEnabled())

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         log.debug("Fixed oob pool thread factory for " + tp);
      }
      
      Map<ThreadFactory, Protocol> factories= new HashMap<ThreadFactory, Protocol>();
      Protocol tmp=tp.getUpProtocol();
      while(tmp != null) {
        ThreadFactory f=tmp.getThreadFactory();
         if(f != null && !factories.containsKey(f))
         {
            factories.put(f, tmp);
         }
         tmp=tmp.getUpProtocol();
      }
      
      for (Map.Entry<ThreadFactory, Protocol> entry : factories.entrySet())
      {
         fixThreadManager(entry.getKey(), threadDecorator, entry.getValue().getClass().getSimpleName() + ".getThreadFactory()");

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                ForkHeader hdr=(ForkHeader)msg.getHeader(id);
                if(hdr == null)
                    break;
                if(hdr.fork_stack_id == null)
                    throw new IllegalArgumentException("header has a null fork_stack_id");
                Protocol bottom_prot=get(hdr.fork_stack_id);
                return bottom_prot != null? bottom_prot.up(evt) : null;


            case Event.VIEW_CHANGE:
                for(Protocol bottom: fork_stacks.values())
                    bottom.up(evt);
                break;

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        // Now pass fork messages up, batched by fork-stack-id
        for(Map.Entry<String,List<Message>> entry: map.entrySet()) {
            String fork_stack_id=entry.getKey();
            List<Message> list=entry.getValue();
            Protocol bottom_prot=get(fork_stack_id);
            if(bottom_prot == null)
                continue;
            MessageBatch mb=new MessageBatch(batch.dest(), batch.sender(), batch.clusterName(), batch.multicast(), list);
            try {
                bottom_prot.up(mb);
            }
            catch(Throwable t) {
                log.error("failed passing up batch", t);
            }
        }

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