// $Id: LOOPBACK.java,v 1.16 2005/08/26 12:26:33 belaban Exp $
package org.jgroups.protocols;
import org.jgroups.Address;
import org.jgroups.Event;
import org.jgroups.Message;
import org.jgroups.stack.IpAddress;
import org.jgroups.stack.Protocol;
import org.jgroups.util.Util;
/**
Makes copies of outgoing messages, swaps sender and receiver and sends the message back up the stack.
*/
public class LOOPBACK extends Protocol {
private Address local_addr=null;
private String group_addr=null;
public LOOPBACK() {
}
public String toString() {
return "Protocol LOOPBACK(local address: " + local_addr + ')';
}
/*------------------------------ Protocol interface ------------------------------ */
public String getName() {
return "LOOPBACK";
}
public void init() throws Exception {
// local_addr=new IpAddress("localhost", 10000) { // fake address
// public String toString() {
// return "<fake>";
// }
// };
//local_addr=new org.jgroups.stack.IpAddress("localhost", 10000); // fake address
local_addr = new IpAddress(12345);
}
public void start() throws Exception {
passUp(new Event(Event.SET_LOCAL_ADDRESS, local_addr));
}
/**
* Caller by the layer above this layer. Usually we just put this Message
* into the send queue and let one or more worker threads handle it. A worker thread
* then removes the Message from the send queue, performs a conversion and adds the
* modified Message to the send queue of the layer below it, by calling Down).
*/
public void down(Event evt) {
if(trace)
log.trace("event is " + evt + ", group_addr=" + group_addr +
", time is " + System.currentTimeMillis() + ", hdrs: " + Util.printEvent(evt));
switch(evt.getType()) {
case Event.MSG:
Message msg=(Message)evt.getArg();
Message rsp=msg.copy();
if(rsp.getSrc() == null)
rsp.setSrc(local_addr);
//dest_addr=msg.getDest();
//rsp.setDest(local_addr);
//rsp.setSrc(dest_addr != null ? dest_addr : local_addr);
up(new Event(Event.MSG, rsp));
break;
case Event.GET_LOCAL_ADDRESS: // return local address -> Event(SET_LOCAL_ADDRESS, local)
passUp(new Event(Event.SET_LOCAL_ADDRESS, local_addr));
break;
case Event.CONNECT:
group_addr=(String)evt.getArg();
passUp(new Event(Event.CONNECT_OK));
break;
case Event.DISCONNECT:
passUp(new Event(Event.DISCONNECT_OK));
break;
case Event.PERF:
passUp(evt);
break;
}
}
/*--------------------------- End of Protocol interface -------------------------- */
}