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org.jgroups.demos.RelayDemo Maven / Gradle / Ivy
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");
}
}
