Salience is considered bad form for two reasons: first, because it's
considered bad form, in general, to try to force the engine to fire
rules in a particular order; and second, it negatively impacts
performance. The truth is, though, if it's the most sensible or
elegant alternative in a particular application, there's really no
reason not to use it.
If you want to not fire any rules in module B until all rules in
module A have had a chance to fire, then rather than putting the focus
statements into a rule, you probably want to put them into the same
code that calls "run" -- i.e.,
(focus A)
(run)
(focus B)
(run)
On Oct 12, 2009, at 3:44 PM, Felix Chan wrote:
Hi,
I have a general question how to control execution using modules.
I have business rules that apply at the country (US) level, and
rules that apply at state level. What I would like to do is to apply
country-level rules first and then state-level rules second. The
state-level rules will overwrite some of the facts that were
modified or asserted as a result of the country-level rules.
I do NOT want to have any state-level rules applied before country-
level rules have a chance to fire.
I can group all the country-level rules in module COUNTRY and state-
level rules in module STATE. I understand that I can put (focus
STATE) on the RHS to move from one module to another to control
execution flow.
Question: What should I do to ensure that I will switch to the STATE
module only after ALL APPLICABLE country-level rules have been
applied (fired)?
I can use salience, but the book says that it's bad form. So I am
wondering if I should module.
Thanks.
Felix
---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences, Sandia National Laboratories
PO Box 969, MS 9012, Livermore, CA 94550
http://www.jessrules.com
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