Excuse me if you already understand but there is a
difference between rule patterns being evaluated and their consequence
running.
Rules LHS are evaluated when objects are inserted into
working memory whereas the consequence fires when you call
fireAllRules();
The rules whose activations are executed are those in the
given Agenda Group; thereafter those not in any agenda group execute. So if all
rules are in an Agenda Group you should be OK.
Of course they don't prevent all rule patterns from
being checked as objects are inserted into WM (which has a performance impact)
but this is what the RETE network was designed to
optimise.
You could try another configuration (but I think
Agenda Groups are probably the preference by design). This gives complete
isolation - but I haven't tried it so it might not even be possible
;-)
global WorkingMemory
wm;
global RuleBase
rbX;
rule "Group X"
when
Fact( attribute == "condition1"
)
then
wm = rbX.newStatefulSession();
wm.fireAllRules();
end
rule "Group Y"
when
Fact( attribute == "condition2"
)
then
wm = rbY.newStatefulSession();
wm.fireAllRules();
end
Good luck.
Mike
Sent: 01 February 2008 15:07
To: Rules Users
List
Subject: Re: [rules-users] Grouping rules
Thanks for responding
Yes, I did consider agenda
groups, but I thought agenda groups only ordered execution in a particular
fashion, so if Rule "pick group X" fires then it would make sure that rules in
Agenda Group X fire first before the remaining but the remaining would fire
eventually. Is my understanding correct ?
I am looking for a solution
for completely isolating a rule set conditioned on an object
attribute.
On Feb 1, 2008 12:46 AM, Anstis, Michael (M.) <
manstis1@ford.com> wrote:
What
about Agenda Groups?
Rule "pick group X"
when
Fact( attribute = "condition1"
)
then
drools.setFocus("Group
X")
end
Rule "pick group Y"
when
Fact( attribute = "condition2"
)
then
drools.setFocus("Group
Y")
end
Rule "Group X1"
Agenda Group "Group X"
when
Smurf(
)
then
// Do
something
end
Rule "Group X2"
Agenda Group "Group X"
when
Smurfette(
)
then
// Something
else
end
etc
Hi,
I am building a system where I would need
to fire different sets of rules based on some attribute in the fact
object.
Here are someways which I thought of, I was
wondering if there was something better than that.
1) I could do
this by creating different sessions based on the data attrbute (different
sessions would have different rule packages based on the
attribute)
or
2) Have all the rules fire (all the different
sets of rules) irrespective of the attribute and have them insert fact new
objects into the working memory. In the second round of rules, collect the
(newly made) fact objects based on the attribute and take that
action.
Thanks
Jai
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