// $Id: WANPING.java,v 1.11 2006/04/23 12:52:54 belaban Exp $
package org.jgroups.protocols;
import org.jgroups.Event;
import org.jgroups.Message;
import org.jgroups.util.List;
import java.util.Enumeration;
import java.util.Properties;
import java.util.StringTokenizer;
/**
* Similar to TCPPING, except that the initial host list is specified as a list of logical pipe names.
*/
public class WANPING extends Discovery {
int port_range=5; // number of ports to be probed for initial membership
List initial_hosts=null; // hosts to be contacted for the initial membership
public String getName() {
return "WANPING";
}
public boolean setProperties(Properties props) {
String str;
str=props.getProperty("port_range"); // if member cannot be contacted on base port,
if(str != null) { // how many times can we increment the port
port_range=Integer.parseInt(str);
props.remove("port_range");
}
str=props.getProperty("initial_hosts");
if(str != null) {
props.remove("initial_hosts");
initial_hosts=createInitialHosts(str);
if(log.isInfoEnabled()) log.info("initial_hosts: " + initial_hosts);
}
if(initial_hosts == null || initial_hosts.size() == 0) {
log.error("WANPING.setProperties(): hosts to contact for initial membership " +
"not specified. Cannot determine coordinator !");
return false;
}
return super.setProperties(props);
}
public void sendGetMembersRequest() {
Message msg, copy;
PingHeader hdr;
String h;
hdr=new PingHeader(PingHeader.GET_MBRS_REQ, null);
msg=new Message(null);
msg.putHeader(getName(), hdr);
for(Enumeration en=initial_hosts.elements(); en.hasMoreElements();) {
h=(String)en.nextElement();
copy=msg.copy();
copy.setDest(new WanPipeAddress(h));
passDown(new Event(Event.MSG, copy));
}
}
/* -------------------------- Private methods ---------------------------- */
/**
* Input is "pipe1,pipe2". Return List of Strings
*/
private List createInitialHosts(String l) {
List tmp=new List();
StringTokenizer tok=new StringTokenizer(l, ",");
String t;
while(tok.hasMoreTokens()) {
try {
t=tok.nextToken();
tmp.add(t.trim());
}
catch(NumberFormatException e) {
log.error("WANPING.createInitialHosts(): " + e);
}
}
return tmp;
}
}