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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 attributeauto-focus. auto-focusmeans 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.
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