11:04 a.m.
Hello,
Recently I read/cam across couple of posts regarding Custom operators and
Accumulators in Drools 6.x.
I seems that I can import them as functions and use them directly without
having to declare them in the configurationBuilder etc.
Can some on Elaborate on this one please?
Do I still extend the Evaluator class? Is there any syntax changes?
Thanks in advance!
Matt'M
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2:55 p.m.
Matt,
Accumulate functions can now be imported as described in the
documentation:
http://docs.jboss.org/drools/release/6.0.1.Final/drools-docs/html_single/...
for "import accumulate")
AFAIK, there are no changes on how evaluators are used in Drools 6.0,
but we do want to make them simpler to use, so we might also add an
import-like statement as we did for accumulate functions in the future.
Edson
On Wed, Mar 5, 2014 at 12:04 PM, mattmadhavan <mmadhavan(a)facs.org> wrote:
Hello,
Recently I read/cam across couple of posts regarding Custom operators and
Accumulators in Drools 6.x.
I seems that I can import them as functions and use them directly without
having to declare them in the configurationBuilder etc.
Can some on Elaborate on this one please?
Do I still extend the Evaluator class? Is there any syntax changes?
Thanks in advance!
Matt'M
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Edson Tirelli
Principal Software Engineer
Red Hat Business Systems and Intelligence Group
5:13 p.m.
Hello,
I am still suck on Drools 5.4/5.5 since I have issues with Custom
operators/Evaluators in 5.6.
I am not able to move to Drools 6.x because the spring configuration is
screwed up. There is no option to configure Custom operator/Evaluators in
kie-spring.
Looks like I just cannot move to 6.x because most of my rules are highly
dependent on the Custom operator/evaluator I created!
I am mighty confused.
Any ideas?
Thanks
Matt
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4:24 p.m.
you no longer need to declare custom accumulators, instead they are specified via imports.
See docs, notice the “import” bit.
http://docs.jboss.org/drools/release/6.0.1.Final/drools-docs/html/DroolsL...
7.8.3.7.4.1. Accumulate CE (preferred syntax)
….
The code for the function is very simple, as we could expect, as all the "dirty"
integration work is done by the engine. Finally, to use the function in the rules, the
author can import it using the "import accumulate" statement:
import accumulate <class_name> <function_name>
For instance, if one implements the class some.package.VarianceFunction function that
implements thevariance function and wants to use it in the rules, he would do the
following:
Example 7.77. Example of importing and using the custom "variance" accumulate
function
import accumulate some.package.VarianceFunction variance
rule "Calculate Variance"
when
accumulate( Test( $s : score ), $v : variance( $s ) )
then
// the variance of the test scores is $v
end
On 5 Mar 2014, at 23:13, mattmadhavan <mmadhavan(a)facs.org> wrote:
Hello,
I am still suck on Drools 5.4/5.5 since I have issues with Custom
operators/Evaluators in 5.6.
I am not able to move to Drools 6.x because the spring configuration is
screwed up. There is no option to configure Custom operator/Evaluators in
kie-spring.
Looks like I just cannot move to 6.x because most of my rules are highly
dependent on the Custom operator/evaluator I created!
I am mighty confused.
Any ideas?
Thanks
Matt
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4:41 p.m.
Hi Mark,
My apologies if I am not clear with my question. I am looking for a way to
create and use my own custom evaluator. (I know its similar to custom
evaluator) I have a written a custom eval operator called *inlist* that
will look to see if the left hand is in a range of values as follows: This
function again encapsulates a very powerful RegEx utility method my
co-worker created:
when
customer:Customer (cancerType == "THYROID" && age *inlist *(10-20,
30-
45, 50, 52, 57-60)
then
.........................
Note that this works only for Drools 5.3, I could not make it to work for
5.6 due to API compatibility.
And I have no idea how to implement this in Drools 6.x. (I used to spring to
configure this)
I doubt I am the only one out there who has a need to write a Custom
evaluator.
Another question is if I follow the sane syntax as the custom accumulator -
can I use the function on the right hand side. How do I get my operands etc.
I appreciate your help in advance!
Any ideas please?
Thanks
Matt'M
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6:34 p.m.
Hello Mark et all,
I referred the source of the class (FOr API etc) of the built-in evaluator
below :
*org.drools.core.base.evaluators.MatchesEvaluatorsDefinition*
and* drools.packagebuilder.conf*
It was a breeze, took me less than 10 minutes!
As Mark Proctor mentioned, lots of plumbing has been taken care of in 6.1
and actually this port was really nice and easy.
I was able to port my old *inlist*operator from Drools 5.3 to 6.1
Now I am willing to recommend my client to use Drools 6.x for our forth
coming major initiative. We have a custom in-house built Rule Engine which I
am trying to replace with Drools. The "Custom Evaluator" is a major thing
for as as all its really powerful and all the analysts need this.
Without this *inlist<.b> operator I am not going anywhere with Drools with
my client.* We will be processing in excess of 30 million FACTS*, (Stateless
Session) using Drools when I am done converting the project to use Drools!
Thanks for all
Matt'M
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4:09 p.m.
Hello,
Do you have any more information on the Custom Evaluators/Operators for
Drools 6.1?
Any information will be appreciated.
Thanks
Matt
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mattmadhavan