Drools 6 - StatelessKieSession - EventListener

Question

I have a simple rule file

rule 'rule name 1'
  when
     $i: Test(param1 < 20)
  then
     $i.setStatus('Param1 has invalid value');
end

rule 'rule name 2'
      when
         $i: Test(param1 > 20)
      then
         $i.setStatus('Param2 has invalid value');
    end

rule 'rule name 3'
      when
         $i: Test(param1 == 100)
      then
         $i.setStatus('Param3 has invalid value');
    end

I use StatelessKieSession to execute a data object on the rules above.

Qn 1: What is the simplest way to trigger a method/listener after executing ALL the rules or How do we know all the rules have been executed?

Qn 2: If we can add a listener to the StatelessKieSession object is there a way to pass an object to the listener?

By ALL rules you mean "all of the rules defined in the DRL were executed at least one" or "all the rules that could have been executed were actually executed"? — Esteban Aliverti
@Esteban, I was referring to "all the rules that could have been executed were actually executed" — Jay

laune laune · Accepted Answer · 2016-08-04T08:34:30

You can obtain all rule names by inspecting the KieBase - see the API documentation.

You can set up a listener according to the API. The method that's called when a rule fires will let you register just that in a Map or similar.

Since a Listener is an object with a certain interface it can have an arbitrary constructor and/or additional methods which will let you pass arbitrary data to that Listener.

Drools 6 - StatelessKieSession - EventListener

1 Answers