org.apache.activemq.artemis.shaded.org.jgroups.demos.RelayDemo Maven / Gradle / Ivy
package org.apache.activemq.artemis.shaded.org.jgroups.demos;
import org.apache.activemq.artemis.shaded.org.jgroups.*;
import org.apache.activemq.artemis.shaded.org.jgroups.util.Util;
/** 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 {
public static void main(String[] args) throws Exception {
String props="udp.xml";
String name=null;
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;
}
System.out.println("RelayDemo [-props props] [-name name]");
return;
}
final JChannel ch=new JChannel(props);
if(name != null)
ch.setName(name);
ch.setReceiver(new ReceiverAdapter() {
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 Message(msg.getSrc(), null, "this is a response");
try {
ch.send(rsp);
}
catch(Exception e) {
e.printStackTrace();
}
}
}
public void viewAccepted(View new_view) {
System.out.println(print(new_view));
}
});
ch.connect("RelayDemo");
for(;;) {
String line=Util.readStringFromStdin(": ");
ch.send(null, line);
}
}
static String print(View view) {
StringBuilder sb=new StringBuilder();
boolean first=true;
sb.append(view.getClass().getSimpleName() + ": ").append(view.getViewId()).append(": ");
for(Address mbr: view.getMembers()) {
if(first)
first=false;
else
sb.append(", ");
sb.append(mbr);
}
return sb.toString();
}
}