Sorry to repost again.... But I also realized after sending that if you have
to exclude locations A, B, and C from the else rule, then you do not need
salience, nor activation group, since all the rules are not mutually
exclusive.. This this (much easier too now)
rule 'Rule One'
when
Person (location == 'A', age > 60 )
Then
do_something();
end
rule 'Rule Two'
when
Person (location == 'B', age > 70 )
Then
do_something();
end
rule 'Rule Three'
when
Person (location == 'C', age > 80 )
Then
do_something();
end
rule 'Rule Else'
when
Person (location not in ('A','B','C'), age > 65 )
Then
do_something();
end
--Armand
From: [email protected]
[mailto:[email protected]] On Behalf Of Welsh, Armand
Sent: Wednesday, November 23, 2011 12:50 PM
To: Rules Users List
Subject: Re: [rules-users] multi-factor rule
Oh... I misread the pseudo code. I missed that the if (age>60) is inside the
if(location=="A") rule. This is easy enough to fix. It's would essentially be
the same thing as the otherwise, but in DRL:
rule 'Rule One'
activation-group 'age-test'
salience 300
when
Person (location == 'A', age > 60 )
Then
do_something();
end
rule 'Rule Two'
activation-group 'age-test'
salience 200
when
Person (location == 'B', age > 70 )
Then
do_something();
end
rule 'Rule Three'
activation-group 'age-test'
salience 100
when
Person (location == 'C', age > 80 )
Then
do_something();
end
rule 'Rule Else'
activation-group 'age-test'
when
Person (location not in ('A','B','C'), age > 65 )
Then
do_something();
end
This is a good example why it can be difficult to model rules from procedural
language. With a rule, you are reacting to a given condition, but with
procedural language waterfall logic, you automatically exclude conditions as
you fall through the logic. With rules, there is not waterfall effect. You
have to simulate the waterfall logic with explicit exclusions.
This is best represented with a lot of if() but no else clauses in procedural
language logic.
Not the only rule I modified to make this work was my else rule.
Regards,
Armand
From: [email protected]
[mailto:[email protected]] On Behalf Of Ronald Albury
Sent: Wednesday, November 23, 2011 11:22 AM
To: [email protected]
Subject: Re: [rules-users] multi-factor rule
Armand
I don't think that works if location=='B' and age=68
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