20.10. Salience State Example: Agenda Group Rules "B to C"

rule "B to C"
      agenda-group "B to C"
      auto-focus true       
  when
      State(name == "B", state == State.FINISHED )      
      c : State(name == "C", state == State.NOTRUN )
  then
      System.out.println(c.getName() + " finished" );
      c.setState( State.FINISHED );
      kcontext.getKnowledgeRuntime().getAgenda().getAgendaGroup( "B to D" ).setFocus();
end
Result: 
rule "B to D"
      agenda-group "B to D"
  when
      State(name == "B", state == State.FINISHED )      
      d : State(name == "D", state == State.NOTRUN )
  then
      System.out.println(d.getName() + " finished" );
      d.setState( State.FINISHED );
end
  • By default, all rules are in the agenda group "MAIN".
  • The "agenda-group" attribute lets you specify a different agenda group for the rule. Initially, a Working Memory has its focus on the Agenda group "MAIN".
  • A group's rules will only fire when the group receives the focus. This can be achieved either by using the method setFocus() or the rule attribute auto-focus.
  • auto-focus means that the rule automatically sets the focus to its agenda group when the rule is matched and activated. It is this "auto-focus" that enables rule "B to C" to fire before "B to D".
  • The rule "B to C" calls setFocus() on the agenda group "B to D", allowing its active rules to fire, which allows the rule "B to D" to fire.
Report a bug