Re: [rules-users] endless loop even with "no-loop"
Maybe your actual business needs have a procedural, flow chart like
aspect to them?
You can chain ruleflow groups in Drools Flow...
If your needs are mostly declarative and you'd like to handle a rare
exception with this "fire once" rule, it can be done of course by
tweaking the rule a bit:
One way is to add an attribute to your fact object, or a "marker fact"
for rule 1 to signal itself it need not run ever again:
(Sorry, I don't have an environment to try this right now, can't vouch
for the syntax... Would anyone consider hosting a drools sandbox?)
rule "rule 1"
when
m : Message( status == Message.HELLO)
not IsProcessed(m);
then
System.out.println( "rule 1" );
m.setMessage( "update 1" );
insert (IsProcessed(m));
update( m );
end
On Thu, Mar 24, 2011 at 10:27 AM, James Gu <jxgu(a)cnsh.delphi-tech.com> wrote:
I tried lock-on-active and it is better than no-loop because it can
avoid
activate other rules in a group. Maybe it is too strong for me.
What I want is :
rule 1 change a attribute and it tells other rules (for example, rule 2)
that the fact data is changed. rule 2 change another attribute, but do not
fire rule 1 again because it is already executed. Each rule should be fired
once at most.
Is there anyway to do this?
--
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