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 !

     *                  which case we won't create any protocols, but still have a separate fork-stack inserted.
     * @return The bottom-most protocol of the new stack, or the existing stack (if present)
     */
    public Protocol createForkStack(String fork_stack_id, final ProtocolStack stack, boolean replace_existing,
                                    List<Protocol> protocols) throws Exception {
        Protocol bottom;
        if((bottom=get(fork_stack_id)) != null && !replace_existing) {
            log.warn("fork-stack %s is already present, won't replace it", fork_stack_id);
            return bottom;
        }


        Protocol current=stack;                          // top
        if(protocols != null && !protocols.isEmpty()) {
            for(int i=protocols.size()-1; i >= 0; i--) {
                Protocol prot=protocols.get(i);
                current.setDownProtocol(prot);
                prot.setUpProtocol(current);
                current=prot;
            }
        }


        bottom=new ForkProtocol(fork_stack_id); // bottom

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        transport.registerProbeHandler(this);
    }


    public void start() throws Exception {
        if(impl != null) impl.start();
        Protocol state_transfer_prot=stack.findProtocol(STATE_TRANSFER.class, StreamingStateTransfer.class);
        if(state_transfer_prot != null) {
            log.debug("%s: found state transfer protocol %s, setting install_view_locally_first to true",
                      local_addr, state_transfer_prot.getClass().getSimpleName());
            install_view_locally_first=true;
        }
    }

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    protected void passMessageUp(Message msg, AsciiString cluster_name, boolean perform_cluster_name_matching,
                                 boolean multicast, boolean discard_own_mcast) {
        if(log.isTraceEnabled())
            log.trace("%s: received %s, headers are %s", local_addr, msg, msg.printHeaders());


        final Protocol tmp_prot=isSingleton()? up_prots.get(cluster_name) : up_prot;
        if(tmp_prot == null)
            return;
        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 && this.cluster_name != null && !this.cluster_name.equals(cluster_name)) {
            if(log_discard_msgs && log.isWarnEnabled()) {
                Address sender=msg.getSrc();
                if(suppress_log_different_cluster != null)
                    suppress_log_different_cluster.log(SuppressLog.Level.warn, sender,
                                                       suppress_time_different_cluster_warnings,
                                                       cluster_name,this.cluster_name, sender);
                else
                    log.warn(Util.getMessage("MsgDroppedDiffCluster"), cluster_name,this.cluster_name, sender);
            }
            return;
        }


        if(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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    protected void passBatchUp(MessageBatch batch, boolean perform_cluster_name_matching, boolean discard_own_mcast) {
        if(log.isTraceEnabled())
            log.trace("%s: received message batch of %d messages from %s", local_addr, batch.size(), batch.sender());


        AsciiString ch_name=batch.clusterName();
        final Protocol tmp_prot=isSingleton()? up_prots.get(ch_name) : up_prot;
        if(tmp_prot == null)
            return;


        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 && cluster_name != null && !cluster_name.equals(ch_name)) {
            if(log_discard_msgs && log.isWarnEnabled()) {
                Address sender=batch.sender();
                if(suppress_log_different_cluster != null)
                    suppress_log_different_cluster.log(SuppressLog.Level.warn, sender,
                                                       suppress_time_different_cluster_warnings,
                                                       ch_name,cluster_name, sender);
                else
                    log.warn(Util.getMessage("BatchDroppedDiffCluster"), ch_name,cluster_name, sender);
            }
            return;
        }


        if(batch.multicast() && discard_own_mcast) {
            Address local=is_protocol_adapter? ((ProtocolAdapter)tmp_prot).getAddress() : local_addr;
            if(local != null && local.equals(batch.sender()))
                return;
        }
        tmp_prot.up(batch);
    }

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    }


    public void init() throws Exception {
        super.init();
        if(start_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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        if(fork_channel_id == null) throw new IllegalArgumentException("fork_channel_id cannot be null");


        this.main_channel=main_channel;
        this.fork_channel_id=fork_channel_id;


        Protocol bottom_prot=null;
        synchronized(ForkChannel.class) { // To prevent multiple concurrent FORK creations https://issues.jboss.org/browse/JGRP-1842
            FORK fork=getFORK(main_channel, position, neighbor, create_fork_if_absent);
            bottom_prot=fork.get(fork_stack_id);
            if(bottom_prot == null) // Create the fork-stack if absent
                bottom_prot=fork.createForkStack(fork_stack_id, new ForkProtocolStack(), false,

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    }


    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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            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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    }
    
    
    private static void addDiscardProtocol(JChannel ch) throws Exception {
        ProtocolStack stack=ch.getProtocolStack();
        Protocol transport=stack.getTransport();
        DISCARD discard=new DISCARD();
        discard.setProtocolStack(ch.getProtocolStack());
        discard.start();
        stack.insertProtocol(discard, ProtocolStack.ABOVE, transport.getName());
    }

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