Drools 6.5 Pseudo Clock - drools

Question

I have some difficulties to do Drools run in pseudo clock.
I configure my engine in stream Mode, and choose the kind of clock I use thru realMode property.
Date refDate = new Date(System.currentTimeMillis());
boolean realMode = false;
SessionPseudoClock clock = null;
KieServices ks = KieServices.Factory.get();
KieSessionConfiguration config = KieServices.Factory.get().newKieSessionConfiguration();
if(realMode) {
config.setOption( ClockTypeOption.get("realtime") );
} else {
config.setOption( ClockTypeOption.get("pseudo") );
}
KieContainer kc = ks.getKieClasspathContainer();
KieSession ksession = kc.newKieSession("cep-rules",config);
KieRuntimeLogger logger = ks.getLoggers().newFileLogger( ksession, "./out/helloworld" );
addNewLogLine (ksession, "GDE" , 0);
addNewLogLine (ksession, "GDE" , 11);
addNewLogLine (ksession, "GDE" , 3);
addNewLogLine (ksession, "GDE" , 8);
logger.close();
ksession.dispose();
The code of AddNewLogLine Function
if( realMode) {
try {
Thread.sleep(delaiInSeconds*1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
if (clock==null) {
clock = ksession.getSessionClock();
}
clock.advanceTime( delaiInSeconds, TimeUnit.SECONDS );
}
delai += delaiInSeconds;
LogItem logLine = new LogItem();
logLine.setEventDate(new Date (refDate.getTime()+(delai*1000)));
logLine.setMessage("Message number " + count);
logLine.setSourceSystemName(sourceSystemName);
System.out.println(logLine);
ksession.insert( logLine );
ksession.fireAllRules();
I leave appart some extra code that is not relevant for my problema.
The rule :
declare LogItem
#role (event)
#timestamp( eventDate )
end
rule "LogInserted"
dialect "mvel"
when
l : LogItem ( )
then
System.out.println ("New Log inside from " + l.getSourceSystemName() );
end
rule "Nb Log SameSystem"
dialect "mvel"
when
accumulate( LogItem ( sourceSystemName == "GDE") over window:time(10s) ; $cnt: count(1); $cnt == 2 )
then
System.out.println ("2 Logs in engine" );
end
The objective : Detect two logs line in a window of 10 seconds.
The first and seconds are not (11s) and the 2 following lines, yes.
In real mode it works fine. Here is the result :
LogItem { message : Message number 1, date : 28/03/2017 11:17:26, sourceSystemName : GDE }
New Log inside from GDE
LogItem { message : Message number 2, date : 28/03/2017 11:17:37, sourceSystemName : GDE }
New Log inside from GDE
LogItem { message : Message number 3, date : 28/03/2017 11:17:40, sourceSystemName : GDE }
New Log inside from GDE
2 Logs in engine
LogItem { message : Message number 4, date : 28/03/2017 11:17:48, sourceSystemName : GDE }
New Log inside from GDE
2 Logs in engine
In pseudo clock mode it doesn't work. Because the 4 lines are inserted in the same time, so the 2 first activate the rule. So the Pseudo clock isn't used.
Here is the result :
LogItem { message : Message number 1, date : 28/03/2017 11:17:26, sourceSystemName : GDE }
New Log inside from GDE
LogItem { message : Message number 2, date : 28/03/2017 11:17:37, sourceSystemName : GDE }
New Log inside from GDE
2 Logs in engine
LogItem { message : Message number 3, date : 28/03/2017 11:17:40, sourceSystemName : GDE }
New Log inside from GDE
LogItem { message : Message number 4, date : 28/03/2017 11:17:48, sourceSystemName : GDE }
New Log inside from GDE
I suppose it's because I don't manage de pseudo clock. But I'm not able to find where I'm wrong.
Anybody ?
Thanks in advance;

Answer 1

I think your problem is due to incorrect manipulation of the pseudo-clock. Also, for best results, run the session in a thread of its own which executes fireUntilHalt:
Runnable fireUntilHaltRunnable = new Runnable() {
public void run() {
// System.out.println( "fireUntilHalt" );
kSession.fireUntilHalt()
}
};
Thread fireUntilHaltThread = new Thread(fireUntilHaltRunnable);
Facts are inserted from another thread. If you are running tests with the pseudo-clock, make sure the pseudo-clock is set to the timestamp of the event if you are using events that contain the timestamp as a field:
private void advance( Date eventDate ){
long currentTime = clock.getCurrentTime();
long eventTime = eventDate.getTime();
clock.advanceTime( eventTime - currentTime, TimeUnit.MILLISECONDS );
}
Do this before you insert the next fact. There is no need to sleep between inserts.