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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging 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.Address;
import org.jgroups.View;
import org.jgroups.logging.Log;
import org.jgroups.util.Util;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentSkipListSet;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * Base class for all relayers
 * @author Bela Ban
 * @since  5.2.17
 */

public abstract class Relayer {
    protected final RELAY                   relay;
    protected final Log                     log;
    /** Flag set when stop() is called. Since a Relayer should not be used after stop() has been called, a new
     * instance needs to be created */
    protected volatile boolean              done;
    protected boolean                       stats;
    /** The routing table. Site IDs are the keys (e.g. "sfo", and list of routes are the values */
    protected final Map> routes=new ConcurrentHashMap<>(5);
    protected final Set    forward_routes=new ConcurrentSkipListSet<>();

    public Relayer(RELAY relay, Log log) {
        this.relay=relay;
        this.log=log;
        this.stats=relay.statsEnabled();
    }

    public abstract void         stop();
    public RELAY                 relay() {return relay;}
    public Log                   log()   {return log;}
    public boolean               done()  {return done;}
    protected abstract View      getBridgeView(String cluster_name);
    protected Route              getRoute(String site) { return getRoute(site, null);}
    public String                toString()     {return String.format("%d routes", routes.size());}
    public int                   getNumRoutes() {return routes.size();}

    protected synchronized Route getRoute(String site, Address sender) {
        List list=routes.get(site);
        if(list == null || list.isEmpty())
            return null;
        if(list.size() == 1)
            return list.get(0);
        return relay.site_master_picker.pickRoute(site, list, sender);
    }

    protected synchronized List getRoutes(String ... excluded_sites) {
        List retval=new ArrayList<>(routes.size());
        for(List list: routes.values()) {
            for(Route route: list) {
                if(route != null && !isExcluded(route, excluded_sites)) {
                    retval.add(route);
                    break;
                }
            }
        }
        return retval;
    }

    protected synchronized void addRoutes(String site, List new_routes) {
        this.routes.put(site, new_routes);
    }

    protected synchronized boolean hasRouteTo(String r) {
        return routes.containsKey(r);
    }

    protected synchronized void removeRoute(String site) {
        routes.remove(site);
    }

    /** Gets routes for a given site. The result is the real value, which can be modified, so make a copy! */
    protected synchronized List getRoutes(String site) {
        return routes.get(site);
    }

    protected synchronized String printRoutes() {
        StringBuilder sb=new StringBuilder();
        for(Map.Entry> entry: routes.entrySet()) {
            List list=entry.getValue();
            if(list != null && !list.isEmpty())
                sb.append(entry.getKey() + " --> ").append(Util.print(list)).append("\n");
        }
        for(ForwardingRoute fr: this.forward_routes) {
            sb.append(String.format("%s --> %s [fwd]\n", fr.to(), fr.gateway()));
        }
        return sb.toString();
    }

    /** Returns a Route matching any of the ForwardingRoutes, or null if none matches */
    protected synchronized Route getForwardingRouteMatching(String site, Address sender) {
        if(site == null)
            return null;
        for(ForwardingRoute fr: forward_routes) {
            if(fr.matches(site)) {
                Route r=getRoute(fr.gateway(), sender);
                if(r != null)
                    return r;
            }
        }
        return null;
    }

    protected Collection getSiteNames() {
        return Stream.concat(Stream.of(relay.site()), routes.keySet().stream())
          .collect(Collectors.toSet());
    }

    protected static boolean isExcluded(Route route, String... excluded_sites) {
        if(excluded_sites == null)
            return false;
        String site=((SiteUUID)route.site_master).getSite();
        for(String excluded_site: excluded_sites)
            if(site.equals(excluded_site))
                return true;
        return false;
    }

}