As far as I know you cannot really do this, because Drools is a
Rete-based system, which is an eager evaluation algorithm. This means
the complete conflict set gets cumputed, followed by the selection of
one to fire (match - select - act). I guess the XOR group will then
delete the other rules from the agenda as well. That's my guess of
course, since I don't know much about the internal details of Drools.
And yes, you are right, this could get really inefficient in some cases,
but, in general, this remains limited. If it really starts to become a
performance issue, you should consider using a system based on a lazy
evaluation algorithm...
Yours,
Pé
Sinha, Amitesh wrote:
If the XOR group is used, all conditions are evaluated and only one
consequence is executed. E.g.,
If I have N rules, all N conditions are evaluated before one consequence
is triggered. If the value of N is very high, this is going to degrade
the performance drastically.
<rule-set>
<rule name=" Rule1">
-
-
-
</rule>
<rule name=" Rule2 ">
-
-
-
</rule>
.
.
.
<rule name=" RuleN ">
-
-
-
</rule>
</rule-set>
Is there a way we can use so that when one condition is satisfied, none
of the other conditions are evaluated?
Thanks in advance,
Amitesh
http://www.patni.com
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