org.jgroups.protocols.DISCARD_PAYLOAD Maven / Gradle / Ivy
package org.jgroups.protocols;
import org.jgroups.Event;
import org.jgroups.Message;
import org.jgroups.annotations.Property;
import org.jgroups.annotations.Unsupported;
import org.jgroups.stack.Protocol;
/**
* Discards a message whose sequence number (in the payload, as a Long) matches seqno 2 times,
* before passing it down. Used for unit testing
* of OOB messages
* @author Bela Ban
*/
@Unsupported
public class DISCARD_PAYLOAD extends Protocol {
@Property protected long seqno=3; // drop 3
@Property protected long duplicate=4; // duplicate 4 (one time)
protected int num_discards=0;
public DISCARD_PAYLOAD() {
}
public Object down(Event evt) {
if(evt.getType() == Event.MSG) {
Message msg=(Message)evt.getArg();
if(msg.getLength() > 0) {
try {
Long payload=(Long)msg.getObject();
if(payload != null) {
if(payload == seqno) {
synchronized(this) {
if(num_discards < 3) {
num_discards++;
return null;
}
}
}
if(payload == duplicate) { // inject a duplicate message
super.down(evt); // pass it down, will passed down a second time by the default down_prot.down(evt)
}
}
}
catch(Throwable t) {
;
}
}
}
return down_prot.down(evt);
}
}