sample.drl

package org.jboss.ddoyle.drools.rules

import org.jboss.ddoyle.drools.model.SimpleEvent

declare SimpleEvent
    @role( event )
    @timestamp( timestamp )
    @expires( 120s )
end

rule "rule_1"
    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

rule "rule_2"
    when
       $s: SimpleEvent ()
       not SimpleEvent (this != $s, timestamp after[0, 30s] $s.timestamp)
       
       
    then
       System.out.println("With timestamp in temporal operators: No event within 30 seconds of this event: " + $s.getId());
end