Re: [rules-users] Use only first matching rule
Georgy,
one (simple) way to achieve this is to assert a "stop"-fact on the
right-hand-side
of the executing rule (e.g. by setting an appropriate attribute) AND
querying that attribute on the LHS of every rule.
Example (pseudo-code)
rule 1
when (business-conditions...)
st: StopFact ( done == false )
then
st.setDone( true ); // make ALL other rules fail
// all other actions...
end
IMHO this is expressive in a way that the "single-rule-only" approach
is clearly visible in all rules...
But: Don't forget to set the StopFact to "not-done" after evaluation...
regards from Cologne,
Gernot
Am 30.10.2007 um 08:21 schrieb nechukin:
Hi,
I'm looking into the Drools engine for our application, and looks
like it's
satisfies the reqirements. The only thing I haven't found still is a
following conflict management model:
If rule_1 (with highest salience) is applicable, STOP applying another
rules.
So the essence is that only 1 or 0 rules should be applied for the
particular entity, not 2 or more.
I'm sure this is supported by engine. Where to look? Tried to scan
ConflictResolving section, but look like it is only about the rules
application order, not more...
Thanks,
Georgy
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