[rules-users] Getting hold of the Evaluator Registry
Edson Tirelli
tirelli at post.com
Thu Jul 16 09:19:59 EDT 2009
There are several places that drools looks for configuration files,
including your home directory. Although, IMO it makes more sense to keep it
confined to the project itself. If you create a dir in your project, like:
src/resources/META-INF
And then configure the eclipse project to use the folde "src/resources"
as a source folder, it will pick it up.
[]s
Edson
2009/7/16 Jaroslaw Kijanowski <kijanowski at gmail.com>
> On Linux, when I created my own accumulate functions, I had to put this
> file in my home directory to have it picked up by Eclipse.
>
> Cheers,
> Jarek
>
> Edson Tirelli wrote:
> >
> > root of your project "classpath", not root of your project.
> >
> > []s
> > Edson
> >
> > 2009/7/15 Asif Iqbal <Asif.Iqbal at infor.com <mailto:Asif.Iqbal at infor.com
> >>
> >
> > Hi Edson,
> >
> >
> >
> > I have gone away and tried the properties method of adding the
> > customEvaluator, which worked fine for the code. But my IDE still
> > does not pick it up. Any ideas?
> >
> >
> >
> > Do I need to place it in a META-INF folder in the root of the
> project?
> >
> >
> >
> > I have the following in the drools.packagebuilder.conf file.
> >
> >
> >
> >
> drools.evaluator.custom=com.infor.audit.bpr.component.validation.impl.drools.CustomComparableEvaluatorsDefinition
> >
> >
> >
> > thanks..
> >
> >
> >
> >
> >
> >
> ------------------------------------------------------------------------
> >
> > *From:* rules-users-bounces at lists.jboss.org
> > <mailto:rules-users-bounces at lists.jboss.org>
> > [mailto:rules-users-bounces at lists.jboss.org
> > <mailto:rules-users-bounces at lists.jboss.org>] *On Behalf Of *Edson
> > Tirelli
> >
> > *Sent:* 15 July 2009 14:57
> > *To:* Rules Users List
> > *Subject:* Re: [rules-users] Getting hold of the Evaluator Registry
> >
> >
> >
> >
> > Yes, you are in the right track, and I understand this is a bit
> > confusing at first. One more reason for people to go to the October
> > Rules Fest 2009 where I will give a presentation on all the ways to
> > extend the engine to solve specific problems. It will be interesting
> > I hope (last year was awesome) and even Charles Forgy will be there
> > doing a presentation on Parallel Rete. :)
> >
> > Meanwhile I will write a tutorial on this, but just to help you
> > there, your approach is correct, except that you don't need to setup
> > the option for each operator. It works like this:
> >
> > * One EvaluatorDefinition class implements support to one or more
> > evaluators, defined by the method public String[] getEvaluatorIds().
> >
> > * All you need to do, then, is wire you class once and the engine
> > will pick-up all the IDs supported by that class. When you have your
> > class wired, you give it a unique string identifier, so that if you
> > ever need to replace it, or remove it, you will use that id.
> > Sometimes we use the operator as the ID, but usually it is something
> > that reminds you of the kind of evaluators that class define. For
> > instance, drools registers the ComparableEvaluatorsDefinition in
> > this way:
> >
> > drools.evaluator.comparable =
> > org.drools.base.evaluators.ComparableEvaluatorsDefinition
> >
> > So in this case, "comparable" is the identifier. Finally, from my
> > previous e-mail you will see that the reason that the eclipse IDE is
> > still giving you errors is that you are using the API to configure
> > the evaluators. Just move the configuration to the configuration
> > file and the IDE will pick it up.
> >
> > []s
> > Edson
> >
> >
> > 2009/7/15 Asif Iqbal <Asif.Iqbal at infor.com
> > <mailto:Asif.Iqbal at infor.com>>
> >
> > Edson,
> >
> >
> >
> > What I have done so far is created a
> > CustomComparableEvaluatorsDefinition, which is exactly the same as
> > the default ComparableEvaluatorsDefinition apart form having support
> > for strings, which I have done by creating
> > StringGreaterOrEqualEvaluators and added that in my custom class,
> > using the addEvaluatorFunction :-
> >
> >
> >
> > addEvaluator( ValueType.SHORT_TYPE,
> > Operator.GREATER, ShortGreaterEvaluator.INSTANCE );
> >
> > addEvaluator( ValueType.SHORT_TYPE,
> > Operator.GREATER_OR_EQUAL, ShortGreaterOrEqualEvaluator.INSTANCE
> );
> >
> > addEvaluator( ValueType.PSHORT_TYPE,
> > Operator.LESS, ShortLessEvaluator.INSTANCE );
> >
> > addEvaluator( ValueType.PSHORT_TYPE,
> > Operator.LESS_OR_EQUAL, ShortLessOrEqualEvaluator.INSTANCE
> );
> >
> > addEvaluator( ValueType.PSHORT_TYPE,
> > Operator.GREATER, ShortGreaterEvaluator.INSTANCE );
> >
> > addEvaluator( ValueType.PSHORT_TYPE,
> > Operator.GREATER_OR_EQUAL, ShortGreaterOrEqualEvaluator.INSTANCE
> );
> >
> > //Custom additions
> >
> > addEvaluator( ValueType.STRING_TYPE,
> > Operator.LESS, StringLessEvaluator.INSTANCE );
> >
> > addEvaluator( ValueType.STRING_TYPE,
> > Operator.LESS_OR_EQUAL, StringLessOrEqualEvaluator.INSTANCE );
> >
> > addEvaluator( ValueType.STRING_TYPE,
> > Operator.GREATER, StringGreaterEvaluator.INSTANCE );
> >
> > addEvaluator( ValueType.STRING_TYPE,
> > Operator.GREATER_OR_EQUAL, StringGreaterOrEqualEvaluator.INSTANCE
> );
> >
> >
> >
> > Now Im am trying to wire it, with the following..
> >
> >
> >
> > CustomComparableEvaluatorsDefinition
> > MyCustomComparable custom = *new*
> > CustomComparableEvaluatorsDefinition();
> >
> > KnowledgeBuilderConfiguration config =
> > KnowledgeBuilderFactory./newKnowledgeBuilderConfiguration/();
> >
> > EvaluatorOption option =
> > EvaluatorOption./get/(_Operator./LESS/.toString()_, custom);
> >
> > EvaluatorOption option2 =
> > EvaluatorOption./get/(_Operator./LESS_OR_EQUAL/.toString()_, custom);
> >
> > EvaluatorOption option3 =
> > EvaluatorOption./get/(_Operator./GREATER/.toString()_, custom);
> >
> > EvaluatorOption option4 =
> > EvaluatorOption./get/(_Operator./GREATER_OR_EQUAL/.toString()_,
> custom);
> >
> >
> >
> > config.setOption(option);
> >
> > config.setOption(option2);
> >
> > config.setOption(option3);
> >
> > config.setOption(option4);
> >
> >
> >
> > Firstly is this the correct approach?....
> >
> >
> >
> > The problem im having is that in my drl files still flag errors,
> > when I do “test” > “test2” , am I missing something?
> >
> >
> >
> > Regards
> >
> >
> >
> >
> ------------------------------------------------------------------------
> >
> > *From:* rules-users-bounces at lists.jboss.org
> > <mailto:rules-users-bounces at lists.jboss.org>
> > [mailto:rules-users-bounces at lists.jboss.org
> > <mailto:rules-users-bounces at lists.jboss.org>] *On Behalf Of *Asif
> Iqbal
> > *Sent:* 15 July 2009 08:20
> > *To:* Rules Users List
> > *Subject:* RE: [rules-users] Getting hold of the Evaluator Registry
> >
> >
> >
> > Edson,
> >
> >
> >
> > Thanks for your replies they have really helped.
> >
> >
> >
> > 1) I am still not sure about creating a new operator, since
> > the ‘>=’ operator already exists it just does not cater for strings,
> > which I want to add. So would creating a new operator cause the
> > existing one to be overrriden when added to the registry?
> >
> >
> >
> > 2) Having looked at the examples and tests you emailed, I am
> > still unsure how to actually wire in the changes, say for example I
> > have replaced the existing ‘>=’ evaluator or created a new evaluator
> > so that ‘>=’ now handles strings. When writing rules will the
> > engine pick this up?.. or do I need to create a new jar by
> > building?.. or do I need to update a configuration file?... im just
> > not sure…
> >
> >
> >
> > 3) Wouldn’t the following also add the evaluator definition by
> > replacing the existing one..
> >
> >
> >
> > _PackageBuilderConfiguration_ pkgb = *_new_*_
> > PackageBuilderConfiguration()_;
> >
> >
> > _pkgb.getEvaluatorRegistry()_._addEvaluatorDefinition_(*new
> > *ComparableEvaluatorsDefinition());
> >
> > _PackageBuilder_ builder = *_new_*_
> > PackageBuilder(pkgb)_;
> >
> >
> >
> > _builder.addPackageFromDrl(source)_;
> >
> > _Package_ pkg = _builder.getPackage()_;
> >
> > // Add the package to a _rulebase_ (deploy the
> > rule package).
> >
> > rules = _RuleBaseFactory./newRuleBase/()_;
> >
> > _rules__.addPackage(pkg)_;
> >
> >
> >
> > Thanks for your help…
> >
> >
> >
> >
> ------------------------------------------------------------------------
> >
> > *From:* rules-users-bounces at lists.jboss.org
> > <mailto:rules-users-bounces at lists.jboss.org>
> > [mailto:rules-users-bounces at lists.jboss.org
> > <mailto:rules-users-bounces at lists.jboss.org>] *On Behalf Of *Edson
> > Tirelli
> > *Sent:* 14 July 2009 23:05
> > *To:* Rules Users List
> > *Subject:* Re: [rules-users] Getting hold of the Evaluator Registry
> >
> >
> >
> >
> > I am working in one example of drools features where I implement
> > a custom evaluator here:
> >
> >
> http://anonsvn.jboss.org/repos/labs/labs/jbossrules/contrib/lotrc/src/main/java/org/drools/examples/lotrc/evaluators/IsAdjacentToEvaluatorDefinition.java
> >
> > I use the configuration file instead of API in the example:
> >
> >
> http://anonsvn.jboss.org/repos/labs/labs/jbossrules/contrib/lotrc/src/main/resources/META-INF/drools.packagebuilder.conf
> >
> > []s
> > Edson
> >
> > 2009/7/14 Edson Tirelli <tirelli at post.com <mailto:tirelli at post.com>>
> >
> >
> > Asif,
> >
> > My recommendation is create a new operator for you instead of
> > overriding existing ones. Although if you really want to replace the
> > existing ones, setting the property or calling the API to register a
> > new operator will override the default.
> >
> > See:
> >
> >
> http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-compiler/src/test/java/org/drools/builder/KnowledgeBuilderConfigurationTest.java
> >
> > Test method:
> >
> > testEvaluatorConfiguration()
> >
> > []s
> > Edson
> >
> > 2009/7/14 Asif Iqbal <Asif.Iqbal at infor.com
> > <mailto:Asif.Iqbal at infor.com>>
> >
> > Hi,
> >
> >
> >
> > What I need to do is modify one of the evaluator classes
> > specifically ‘<=’, so that it can handle strings. Now I know I need
> > to create a class similar to ComparableEvaluatorDefinition. But what
> > I want to do is replace the existing one in the evaluator registry
> > with my implementation which will include the additional String
> > capability.
> >
> >
> >
> > From my understanding that should be all that is required. Unless im
> > missing something… now all I need to know is how do I get hold of
> > the evaluator registry?
> >
> >
> >
> > Cheers
> >
> >
> >
> > I
> >
> >
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org <mailto:rules-users at lists.jboss.org>
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
> >
> >
> > --
> > Edson Tirelli
> > JBoss Drools Core Development
> > JBoss by Red Hat @ www.jboss.com <http://www.jboss.com>
> >
> >
> >
> >
> > --
> > Edson Tirelli
> > JBoss Drools Core Development
> > JBoss by Red Hat @ www.jboss.com <http://www.jboss.com>
> >
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org <mailto:rules-users at lists.jboss.org>
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
> >
> >
> > --
> > Edson Tirelli
> > JBoss Drools Core Development
> > JBoss by Red Hat @ www.jboss.com <http://www.jboss.com>
> >
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org <mailto:rules-users at lists.jboss.org>
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
> >
> >
> > --
> > Edson Tirelli
> > JBoss Drools Core Development
> > JBoss by Red Hat @ www.jboss.com <http://www.jboss.com>
> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> http://lists.jboss.org/mailman/listinfo/rules-users
>
--
Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
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