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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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package org.jgroups.protocols.relay;

import org.jgroups.*;
import org.jgroups.logging.Log;
import org.jgroups.stack.AddressGenerator;
import org.jgroups.util.Util;

import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * Class which joins the bridge cluster and send and receives messages to/from other sites. Also generates
 * sitesUp()/sitesDown() notifications from view changes
 * @author Bela Ban
 * @since  5.2.17
 */
public class Bridge implements Receiver {
    protected final JChannel channel;
    protected final Relayer3 rel;
    protected final RELAY    relay;
    protected final Log      log;
    protected final String   cluster_name;
    protected       View     view;


    protected Bridge(final JChannel ch, final Relayer3 r, final String cluster_name,
                     String channel_name, AddressGenerator addr_generator) throws Exception {
        this.channel=ch;
        this.cluster_name=cluster_name;
        this.rel=r;
        this.relay=rel.relay();
        this.log=rel.log();
        channel.setName(channel_name).setReceiver(this).addAddressGenerator(addr_generator);
    }

    protected void start() throws Exception {
        channel.connect(cluster_name);
        log.info("%s: joined bridge cluster '%s'", channel.getAddress(), cluster_name);
    }

    protected void stop() {
        log.info("%s: leaving bridge cluster '%s'", channel.getAddress(), channel.getClusterName());
        Util.close(channel);
    }

    public void receive(Message msg) {
        relay.handleRelayMessage(msg);
    }

    /** The view contains a list of SiteUUIDs. Adjust the routing table based on the SiteUUIDs and site */
    public void viewAccepted(View new_view) {
        View                      old_view=this.view;
        Map> sites=Util.getSites(new_view, relay.site());
        List              removed_routes=removedRoutes(old_view, new_view);
        Set               up=new HashSet<>(), down=new HashSet<>(removed_routes);

        this.view=new_view;
        // add new routes to routing table:
        for(String r: sites.keySet()) {
            if(!rel.containsRoute(r))
                up.add(r);
        }
        log.trace("[Relayer " + channel.getAddress() + "] view: " + new_view);
        for(Map.Entry> entry: sites.entrySet()) {
            String        key=entry.getKey();
            List val=entry.getValue();
            List   existing=rel.getRoutes(key);
            List   newRoutes=existing != null? new ArrayList<>(existing) : new ArrayList<>();

            // Remove routes not in the view anymore:
            newRoutes.removeIf(r -> !val.contains(r.siteMaster()));

            // Add routes that aren't yet in the routing table:
            val.stream().filter(addr -> !contains(newRoutes, addr))
              .forEach(addr -> newRoutes.add(new Route(addr, channel, relay, log).stats(relay.statsEnabled())));

            if(newRoutes.isEmpty()) {
                rel.removeRoute(key);
                down.add(key);
            }
            else
                rel.addRoutes(key, newRoutes);
        }

        // remove all routes which were dropped between the old and new view:
        if(!removed_routes.isEmpty() && log.isTraceEnabled())
            log.trace("%s: removing routes %s from routing table", channel.getAddress(), removed_routes);
        // removed_routes.forEach(rel.routes.keySet()::remove);
        removed_routes.forEach(rel::removeRoute);

        if(!down.isEmpty())
            relay.sitesChange(true, down);
        if(!up.isEmpty())
            relay.sitesChange(false, up);
    }

    @Override
    public String toString() {
        return String.format("bridge %s", cluster_name);
    }

    protected static boolean contains(List routes, Address addr) {
        return routes.stream().anyMatch(route -> route.siteMaster().equals(addr));
    }

    /** Returns a list of routes that were in old_view, but are no longer in new_view */
    protected static List removedRoutes(View old_view, View new_view) {
        List l=new ArrayList<>();
        if(old_view == null)
            return l;
        List old_routes=Stream.of(old_view.getMembersRaw()).filter(a -> a instanceof SiteUUID)
          .map(s -> ((SiteUUID)s).getSite()).collect(Collectors.toList());
        List new_routes=Stream.of(new_view.getMembersRaw()).filter(a -> a instanceof SiteUUID)
          .map(s -> ((SiteUUID)s).getSite()).collect(Collectors.toList());
        old_routes.removeAll(new_routes);
        return old_routes;
    }


}