10:41 a.m.
I'm new to the rules syntax and a bit frustrated with trying to learn it. I've
reviewed the docs but keep running into the same issue. I have a parent object,
Message, that contains an Order. An Order has a status that I want to test. So
looking at the documentation and taking my best guess I've created a rule as
follows:
rule "Order not Accepted"
when
$m : Message( state == MessageState.RELEASING, order.requestStatus ==
RequestStatus.ACCEPT )
then
...
end
The problem is that when I start my application I get a compilation error.
Caused by:
org.drools.rule.InvalidRulePackage: [54,54]: unknown:54:54 mismatched token:
[@423,1899:1899='.',<69>,54:54]; expecting type RIGHT_PAREN[54,94]:
unknown:54:94 mismatched token: [@433,1939:1939=')',<37>,54:94]; expecting
type
LEFT_PAREN
at org.drools.rule.Package.checkValidity(Package.java:368)
So what am I missing? I know it has to be something simple with my understanding
of the syntax.
Thanks for the help...
12:48 p.m.
Chris Mathrusse <christopher.mathrusse <at> sybase.com> writes:
Please disregard this post. It was a duplicate.
1:19 p.m.
Chris,
There is quite a few messages in the list archives about the "issues" of
using nested objects.
Best way is always to work with a "relational model" and assert all your
objects to the working memory. One example would be:
rule R1
when
$o : Order( requestStatus == RequestStatus.ACCEPT )
Message( state == MessageState.RELEASING, order == $o )
then
// do something
end
Having said that, if you don't think it is justifiable to assert all
objects into working memory because of just a few rules, you can also use
the "from" CE:
rule R2
when
$m : Message( state == MessageState.RELEASING )
Order( requestStatus == RequestStatus.ACCEPT ) from $m.getOrder()
then
// do something
end
Finally, version 4.0 final will allow you to write the rule the way you
wrote:
rule R3
when
$m : Message( state == MessageState.RELEASING, order.requestStatus ==
RequestStatus.ACCEPT )
then
// do something
end
But it is important to note that the above will automatically generate an
embedded eval() for you, that is exactly the same as doing:
rule R4
when
$m : Message( state == MessageState.RELEASING, eval(
order.getRequestStatus() == RequestStatus.ACCEPT ) )
then
// do something
end
And eval result needs to be constant over time.
BTW, syntaxes used in R1, R2 and R4 are already supported in MR2/trunk.
Syntax used in R3 above will be available in Drools 4.0 final release.
[]s
Edson
2007/6/6, Chris Mathrusse <christopher.mathrusse(a)sybase.com>:
I'm new to the rules syntax and a bit frustrated with trying to learn it.
I've
reviewed the docs but keep running into the same issue. I have a parent
object,
Message, that contains an Order. An Order has a status that I want to
test. So
looking at the documentation and taking my best guess I've created a rule
as
follows:
rule "Order not Accepted"
when
$m : Message( state == MessageState.RELEASING, order.requestStatus ==
RequestStatus.ACCEPT )
then
...
end
The problem is that when I start my application I get a compilation error.
Caused by:
org.drools.rule.InvalidRulePackage: [54,54]: unknown:54:54 mismatched
token:
[@423,1899:1899='.',<69>,54:54]; expecting type RIGHT_PAREN[54,94]:
unknown:54:94 mismatched token: [@433,1939:1939=')',<37>,54:94]; expecting
type
LEFT_PAREN
at org.drools.rule.Package.checkValidity(Package.java:368)
So what am I missing? I know it has to be something simple with my
understanding
of the syntax.
Thanks for the help...
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Edson Tirelli
Software Engineer - JBoss Rules Core Developer
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2 comments
2 participants
participants (2)
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Chris Mathrusse -
Edson Tirelli