Scott,
My advice is to make your Regions explicit instead of using modules for
this purpose.
You could create a Region class (in Java), create instances of these
objects and definstance them as needed. Your rules could then pattern
match against these Region objects.
This is essentially making explicit something that would happen
implicitly via modules, with the added advantage of being able to
define/control all the behavior related to the Regions w/o relying on
Jess' rule firing mechanisms.
I did a similar thing with state machines. Initially, I wanted to use
modules because they were there but other pieces of Java code needed to
have access to the current state, etc. and I found having these defined
as Java objects made that integration easier. Your mileage may vary
depending on how Java centric your application is.
Of course you could use deftemplates instead of POJOs because the
explicit vs. implicit design still applies.
Good luck!
alan
Krasnigor, Scott L (N-AST) wrote:
Hi all,
Quick question. I have a set of rules that I use as a template. I plan
on having a user be able to define a region in space. Based on the
values entered, the app will modify the set of rules in the template and
save it as a new set of rules based on the region defined and then load
those rules into a running engine thread. There can be multiple sets of
regions defined and associated rules applied. Once a fact is asserted,
the rules determine if the data associated with the fact are in a
defined region. I need to be able to distinguish between the different
rule sets (regions) in an engine. I was thinking of creating modules
based on the different regions. Is this the most efficient way to do
this? How would I make sure that once a fact is asserted (or modified),
it gets evaluated for all the regions (modules) defined? Thanks.
Scott
Scott L. Krasnigor
Principal Engineer/Scientist
Atlantic Science & Technology
Lockheed Martin - MS2
' 856-359-3094
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