Drools - Multiple rules fire even though they all belong to the same activation group

Question

I have a set of rules as follows:

rule "Default Margin By Grade"
ruleflow-group "MarginByGrade"
enabled false
when
    $mg : MarginByGrade()
    $u  : PriceUnit( resale==null, trimGrade memberOf $mg.grades  )
then    
end

rule "Grade Margin By Group, Style" extends "Default Margin By Grade"
activation-group "Margin By Grade"
salience 500
when
    MarginByGrade(this == $mg, $u.model memberOf $mg.models,  $u.style memberOf $mg.styles)
then
    System.out.println("Found match : " + $mg);
end

rule "Grade Margin By Style" extends "Default Margin By Grade"
activation-group "Margin By Grade"
salience 100
when
    MarginByGrade(this == $mg, models == null, $u.style memberOf $mg.styles)
then
    System.out.println("Found match : " + $mg);
end

rule "Grade Margin By Group" extends "Default Margin By Grade"
activation-group "Margin By Grade"
salience 50
when
    MarginByGrade(this == $mg, prefixes memberOf prefixes, styles == null)
then
    System.out.println("Found match : " + $mg);
end

rule "Margin by Grade" extends "Default Margin By Grade"
salience 5
activation-group "Margin By Grade"
when
    MarginByGrade(this == $mg, prefixes == null, styles == null)
then
    System.out.println("Found match : " + $mg);
end

The rules are triggered based on a Rule Flow (hence the 'ruleflow-group' attribute. My requirement is that once the rule with the highest salience fires, the rules with the lower salience should not fire. Yet when I run provide a fact that activates multiple rules, all activated rules get fired:

Start Process: Mon Sep 19 15:58:39 EDT 2011
Found match : MarginByGrade( prefixes=null, styles=null, grades=[C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S], margin=26.0000 )
Found match : MarginByGrade( prefixes=[015, 215], styles=[572], grades=[A, B, D], margin=25.5000 )
Found match : MarginByGrade( prefixes=[015, 010], styles=[515, 215, 572], grades=[C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S], margin=24.5000 )
015572  D 015572  D933079 FN 175->null
Dispose Session: Mon Sep 19 15:58:39 EDT 2011

What am I doing wrong? I'm using Drools Expert 5.2.0-Final.

Answer 1

Well you are using activation-group and not ruleflow-group right?.. The activation-group will cause that only one rule get executed and as you mention the one with higher salience will be executed if it is activated. Cheers