Inside eval() you write plain java code, where == is the identity
operator. When you write constraints, you are using DRL language where ==
calls .equals() method behind the scenes.
[]s
Edson
2009/8/3 Shah, Malay <Malay.Shah(a)morganstanley.com>
Minor correction in the rule:
The eval block is:
eval(lastCapacity *=**=* null && entityOid == parentOid && msgType ==
"8")
instead of
eval(lastCapacity *!**= *null && entityOid == parentOid && msgType ==
"8")
Any help is much appreciated.
Thanks
Malay Shah
------------------------------
*From:* Shah, Malay (IDEAS)
*Sent:* Monday, August 03, 2009 4:18 PM
*To:* rules-users(a)lists.jboss.org
*Subject:* Question on eval block
Hi,
I am trying to use eval block in one of the rules and am a bit confused
about it. The rule is something like this:
rule "LastCapacity"
when
e: Execution(lastCapacity:lastCapacity,parentOid:parentOid)
eo:
ExecutionOrder(entityOid:entityOid,msgType:msgType,execType:execType)
* eval(lastCapacity * *!**= null && entityOid == parentOid && msgType
== "8")*
then
..................
end
where Execution and ExecutionOrder are 2 objects that are linked by an ID.
I expect eval to return true for certain sets of objects that I send. But,
the above rule exits without running the consequence. On the other hand,
when I write the rule as:
rule "LastCapacity"
when
e: Execution(lastCapacity:*lastCapacity==null*,parentOid:parentOid)
eo: ExecutionOrder(entityOid:*entityOid == parentOid*, *msgType == "8"
*)
then
.............................
end
the rule triggers the consequence for same set of objects. I thought that
if the expression in eval block comes out to be true, the consequence will
be triggered. Am I missing something obvious here?
Thanks
Malay Shah
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Edson Tirelli
JBoss Drools Core Development
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