I am working on an application that tells how much insulin should be given to
a patient with different glucose values. I have a decision object that
contains the current value of glucose and the rules alter the decision
object to include advice or explanations.
Since the decision object is modified, I have to have some kind of state
object so that rules do not loop; I have created a state object that has a
series of boolean fields which are checked. However, this feels like I am
circumventing the whole idea of an inference engine. So I have made an
alternative helper class that contains inner classes that can be inserted as
facts.
Here is a sample rule with the first method:
[code]
rule "Detect mild hypoglycemia"
when
decision : GlucoseDecision( serumGlucoseConcentration < 80,
serumGlucoseConcentration >= 60 )
decisionState : GlucoseDecisionState(currentGlucoseBelowRange
== true,
mildHypoglycemia == false)
then
decisionState.setMildHypoglycemia(true);
decision.explain("The patient has mild hypoglycemia (serum
glucose is " +
decision.getSerumGlucoseConcentration() +"
mg/dL).");
end
[/code]
Here is the same rule using the second approach:
[code]
rule "Detect mild hypoglycemia"
when
decision : GlucoseDecision( serumGlucoseConcentration < 80,
serumGlucoseConcentration >= 60 )
currentGlucoseBelowRange()
not(mildHypoglycemia())
then
insert(new mildHypoglycemia());
decision.explain("The patient has mild hypoglycemia (serum
glucose is " +
decision.getSerumGlucoseConcentration() +"
mg/dL).");
end
[/code]
My question is whether one or the other of these approaches is a better
practice? Using facts would make my rules trace more sensible, I think, but
perhaps it is much less efficient. Comments are appreciated. Thank you.
- Mike
--
View this message in context:
http://www.nabble.com/Best-%28better%29-practices-question-tp20742140p20742140.html
Sent from the drools - user mailing list archive at Nabble.com.
_______________________________________________
rules-users mailing list
[email protected]
https://lists.jboss.org/mailman/listinfo/rules-users
