org.jgroups.demos.RelayDemo Maven / Gradle / Ivy
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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.demos;
import org.jgroups.*;
import org.jgroups.protocols.relay.*;
import org.jgroups.protocols.relay.Topology;
import org.jgroups.util.ExtendedUUID;
import org.jgroups.util.UUID;
import org.jgroups.util.Util;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
/** Demos RELAY. Create 2 *separate* clusters with RELAY as top protocol. Each RELAY has bridge_props="tcp.xml" (tcp.xml
* needs to be present). Then start 2 instances in the first cluster and 2 instances in the second cluster. They should
* find each other, and typing in a window should send the text to everyone, plus we should get 4 responses.
* @author Bela Ban
*/
public class RelayDemo implements Receiver {
protected static final String SITE_MASTERS="site-masters", SENDTO="sendto";
protected JChannel ch;
protected RELAY relay;
public static void main(String[] args) throws Exception {
String props="udp.xml";
String name=null;
boolean print_route_status=true, nohup=false, use_view_handler=true;
for(int i=0; i < args.length; i++) {
if(args[i].equals("-props")) {
props=args[++i];
continue;
}
if(args[i].equals("-name")) {
name=args[++i];
continue;
}
if(args[i].equals("-print_route_status")) {
print_route_status=Boolean.parseBoolean(args[++i]);
continue;
}
if(args[i].equals("-nohup")) {
nohup=true;
continue;
}
if("-use_view_handler".equals(args[i])) {
use_view_handler=Boolean.parseBoolean(args[++i]);
continue;
}
System.out.println("RelayDemo [-props props] [-name name] [-print_route_status false|true] " +
"[-nohup] [-use_view_handler [true|false]]");
return;
}
RelayDemo demo=new RelayDemo();
demo.start(props, name, print_route_status, nohup, use_view_handler);
}
public void receive(Message msg) {
Address sender=msg.getSrc();
System.out.println("<< " + msg.getObject() + " from " + sender);
Address dst=msg.getDest();
if(dst == null) {
Message rsp=new ObjectMessage(msg.getSrc(), "response");
try {
ch.send(rsp);
}
catch(Exception e) {
e.printStackTrace();
}
}
}
public void viewAccepted(View new_view) {
System.out.printf("Local view: %s\n", new_view);
}
protected void start(String props, String name, boolean print_route_status,
boolean nohup, boolean use_view_handler) throws Exception {
ExtendedUUID.setPrintFunction(UUID::printName);
ch=new JChannel(props).setReceiver(this);
if(name != null)
ch.setName(name);
relay=ch.getProtocolStack().findProtocol(RELAY.class);
if(relay == null)
throw new IllegalStateException(String.format("Protocol %s not found", RELAY.class.getSimpleName()));
String site_name=relay.site();
if(print_route_status)
relay.setRouteStatusListener(new DefaultRouteStatusListener(() -> relay.addr()).verbose(true));
if(use_view_handler)
relay.topo().setViewHandler((s, v) -> {
if(!s.equals(relay.getSite()))
System.out.printf("Global view: %s\n", v);
});
ch.connect(site_name);
if(!nohup) {
eventLoop(ch);
Util.close(ch);
}
}
protected void eventLoop(JChannel ch) {
for(;;) {
try {
String line=Util.readStringFromStdin(": ");
if(line == null)
break;
if(process(line)) // see if we have a command, otherwise pass down
continue;
ObjectMessage msg=new ObjectMessage(null, line);
ch.send(msg);
}
catch(Throwable t) {
t.printStackTrace();
}
}
}
protected boolean process(String line) {
if(line == null || line.isEmpty())
return true;
if(line.equalsIgnoreCase(SITE_MASTERS) || line.equalsIgnoreCase("sm")) {
System.out.printf("site masters in %s: %s\n", relay.site(), relay.siteMasters());
return true;
}
if(line.equalsIgnoreCase("help")) {
help();
return true;
}
if(line.equalsIgnoreCase("mbrs")) {
System.out.printf("%s: local members: %s\n", relay.getAddress(), relay.members());
return true;
}
if(line.equalsIgnoreCase("sites")) {
System.out.printf("configured sites: %s\n", relay.getSites());
return true;
}
if(line.startsWith("topo") && relay instanceof RELAY3) {
System.out.printf("\n%s\n", printTopo(line, "topo", true));
return true;
}
if(line.startsWith("pt") && relay instanceof RELAY3) {
System.out.printf("\n%s\n", printTopo(line, "pt", false));
return true;
}
if(line.startsWith("routes")) {
System.out.printf("%s\n", relay.printRoutes());
return true;
}
if(line.startsWith(SENDTO)) {
sendTo(line);
return true;
}
return false;
}
// sendto dest msg times sleep
protected void sendTo(String line) {
String[] list=line.split("\\s"); // whitespace, ie. " "
long sleep=Long.parseLong(list[list.length-1]);
int times=Integer.parseInt(list[list.length-2]);
String dest=list[1];
List tmp=new ArrayList<>(Arrays.asList(list).subList(2, list.length - 2));
String msg=String.join(" ", tmp);
String[] s=dest.split(":");
String member_name=s[0], site_name=s[1];
Map cache=relay.topo().cache();
View v=cache.get(site_name);
if(v == null)
throw new IllegalArgumentException(String.format("site %s not found in cache", site_name));
Address target=null;
for(Address addr: v) {
SiteUUID sa=(SiteUUID)addr;
if(member_name.equals(sa.getName())) {
target=sa;
break;
}
}
if(target == null)
throw new IllegalArgumentException(String.format("member %s not found in cache", member_name));
try {
for(int i=1; i <= times; i++) {
ch.send(target, String.format("%s [#%d]", msg, i));
Util.sleep(sleep);
}
}
catch(Exception ex) {
System.err.printf("failed sending msg to %s: %s\n", target, ex);
}
}
protected String printTopo(String line, String command, boolean refresh) {
String sub=line.substring(command.length()).trim();
String site=null;
if(sub != null && !sub.isEmpty()) {
String[] tmp=sub.split(" ");
site=tmp.length > 0 && !tmp[0].isEmpty()? tmp[0].trim() : null;
}
Topology topo=relay.topo();
if(refresh) {
topo.removeAll(site != null? List.of(site) : null).refresh(site);
Util.sleep(100);
}
return topo.print(site);
}
protected static void help() {
System.out.println("\ncommands:" +
"\nhelp" +
"\nmbrs: prints the local members" +
"\nsite-masters (sm): prints the site masters of this site" +
"\nsites: prints the configured sites" +
"\ntopo: prints the topology (site masters and local members of all sites)" +
"\npt: prints the cache (no refresh)" +
"\nroutes: prints all routes (if site master)" +
"\nsendto msg (dest example: \"N:net1\")\n");
}
}
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