sample.dl

package org.jboss.ddoyle.drools.rules

import org.jboss.ddoyle.drools.model.SimpleEvent
import org.kie.api.time.SessionClock

declare SimpleEvent
    @role( event )
    @timestamp( timestamp )
    //There is a bug in Drools which causes disabling event expiration with @expires( -1 ) not to work: https://issues.jboss.org/browse/DROOLS-984
    //So we set expiration to a very large value.
    @expires( 10000d )
end

global org.kie.api.time.SessionClock clock;

/*
 * Rule that retracts the SimpleEvent after 300 seconds (i.e. 300 seconds after its timestamp).
 */
rule "SimpleEvent_retract"
timer (int: 60s)
when
	$s: SimpleEvent(clock.getCurrentTime() after [300s] timestamp)
then
	retract($s);
end

rule "SimpleEventRule"
    when
       $s: SimpleEvent ()
       not SimpleEvent (this != $s, this after[0, 30s] $s)
    then
       System.out.println("No event within 30 seconds of this event: " + $s.getId());
end