// $Id: Ping.java,v 1.7 2005/05/30 16:15:11 belaban Exp $
package org.jgroups.tests;
import org.jgroups.*;
import org.jgroups.protocols.PingRsp;
import org.jgroups.util.Util;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
/**
Determines the initial set of members given a group name and properties and prints them to stdout. Does not
connect to the group, but - using a minimal stack of UPD/PING or TCP/TCPPING - only sends a FIND_INITIAL_MBRS
down the stack (PING or TCPPING has to be present for this to work) and waits for FIND_INITIAL_MBRS_OK. When
received, the results are printed and then the app terminates.<p>
To connect to any group, it is essential that the groupname given (-group) is the same as the one of the group
and the properties are the same as the bottom 2 layers of the group properties, e.g. if the group properties are:
<pre>
TCP(start_port=7800):TCPPING(initial_hosts=daddy.nms.fnc.fujitsu.com[7800];port_range=2;timeout=5000;num_initial_members=3;up_thread=true;down_thread=true):pbcast.STABLE(desired_avg_gossip=200000;down_thread=false;up_thread=false):pbcast.NAKACK(down_thread=true;up_thread=true;gc_lag=100;retransmit_timeout=3000):pbcast.GMS(join_timeout=5000;join_retry_timeout=2000;shun=false;print_local_addr=false;down_thread=true;up_thread=true)
</pre>
,then the stack properties should be:
<pre>
TCP(start_port=7800):TCPPING(initial_hosts=daddy.nms.fnc.fujitsu.com[7800];port_range=2;timeout=5000;num_initial_members=3)
</pre>
@author Bela Ban, June 12 2001
*/
public class Ping implements UpHandler {
Channel channel=null;
boolean print_all_events=false;
public Ping(String props, boolean trace, boolean printall) throws Exception {
print_all_events=printall;
if(trace)
channel=new JChannel(props);
channel.setUpHandler(this);
}
public void go(String groupname) {
try {
channel.connect(groupname);
channel.down(Event.FIND_INITIAL_MBRS_EVT);
}
catch(Exception e) {
System.err.println("Ping.go(): " + e);
System.exit(1);
}
}
/** UpHandler interface */
public void up(Event evt) {
Vector v;
PingRsp rsp;
if(evt.getType() == Event.FIND_INITIAL_MBRS_OK) {
v=(Vector)evt.getArg();
System.out.println("Found " + v.size() + " members");
for(int i=0; i < v.size(); i++) {
rsp=(PingRsp)v.elementAt(i);
System.out.println("Rsp #" + (i + 1) + ": " + rsp);
}
if(v.size() > 0)
verifyCoordinator(v);
System.exit(1);
}
else {
if(print_all_events)
System.out.println(">> " + evt);
}
}
static void verifyCoordinator(Vector rsps) {
Hashtable votes=new Hashtable(); // coord address, list of members who voted for this guy
PingRsp rsp;
Vector v;
Address coord, mbr;
for(int i=0; i < rsps.size(); i++) {
rsp=(PingRsp)rsps.elementAt(i);
coord=rsp.getCoordAddress();
mbr=rsp.getAddress();
v=(Vector)votes.get(coord);
if(v == null) {
v=new Vector();
votes.put(coord, v);
}
if(!v.contains(mbr))
v.addElement(mbr);
}
System.out.println("");
if(votes.size() > 1)
System.err.println("*** Found more than 1 coordinator !");
printVotes(votes);
}
static void printVotes(Hashtable votes) {
Object key;
Vector val;
for(Enumeration e=votes.keys(); e.hasMoreElements();) {
key=e.nextElement();
val=(Vector)votes.get(key);
System.out.println("\n\nCoord: " + key);
System.out.println("Votes: " + val + '\n');
}
}
public static void main(String[] args) {
Ping ping=null;
boolean trace=false;
String groupname=Util.shortName(Util.getHostname());
boolean printall=false;
String props="UDP(mcast_addr=224.0.0.200;mcast_port=7500;ip_ttl=0;" +
"ucast_send_buf_size=30000;ucast_recv_buf_size=60000):" +
"PING(timeout=5000;num_initial_members=30)";
for(int i=0; i < args.length; i++) {
if("-help".equals(args[i])) {
usage();
return;
}
if("-trace".equals(args[i])) {
trace=true;
continue;
}
if("-printall".equals(args[i])) {
printall=true;
continue;
}
if("-group".equals(args[i])) {
groupname=args[++i];
continue;
}
if("-props".equals(args[i])) {
props=args[++i];
continue;
}
usage();
return;
}
try {
ping=new Ping(props, trace, printall);
ping.go(groupname);
}
catch(Exception e) {
System.err.println("Ping.main(): " + e);
System.exit(0);
}
}
static void usage() {
System.out.println("Ping [-help] [-trace] [-group <groupname>] [-props <properties>] [-printall]");
}
}