[rules-dev] Knowledge Composition and Parts

[Mark Proctor]

Nimesh Muley wrote:
> Hi,
>
> To load a resource from DB would someone need to provide a custom implementation of Resource (meant for DB lookup) and then use it in the KnowledgeBuilder? Can this definition be later extended to load a resource from a repository once repository concept is there during execution time (similar / same as what is available at definition time)?
>   
This might be possible, I'll bear it in mind as an enhancements for 5.1.
> Should resource configuration at Resource level (part) or at KnowledgeBuilder? As per my understanding of the definition below, it seems more apt at KnowledgeBuilder level.
>   
If you look at the javadocs for drools-api ResourceConfiguration is 
specific to what you are loading, for instance with decision tables (the 
only place where it is currently used) it provides the binary type, XLS 
or CSV, and optionally the worksheet name.

Mark
> Regards,
> - Nimesh
>
>
> -----Original Message-----
> From: rules-dev-bounces at lists.jboss.org [mailto:rules-dev-bounces at lists.jboss.org] On Behalf Of Mark Proctor
> Sent: Thursday, November 27, 2008 12:01 PM
> To: Rules Dev List
> Subject: [rules-dev] Knowledge Composition and Parts
>
> I'm in the process of doing the final changes to drools-api. Having done
> the spring work, not yet committed, I liked their resource framework, so
> decided to copy this for Drools. So we now have:
> KnowledgeBuilder.add( Resource, KnowledgeType, ResourceConfiguration );
>
> Where we support the following Resource sources:
> FileSystemResource, ClassPathResource, UrlResource ByteArrayResource,
> ReaderResource, EncodedResource and InputStreamResource
>
> In use it'll look like:
> kbuilder.add( ResourceFactory.newClassPathResource( "somefile.drl",
> classLoader ), KnowledgeType.DRL )
>
> I do not yet do knowledge type inference from the .ext - I think I'll
> leave that till after 5.0, if I do it at all.
>
> So kbuilder.addResource( URL, ...) and kbuilder.addResource( Reader, ...
> ) from M3 no longer exist and are as above.
>
> What I'm adding now is the ability to provide an xml file that is a
> configuration of resources to load. The term Configuration is
> overloaded, and we use this more to provide the directives for
> knowledgebuilder and knowledgebase. So I was thinking Composition and
> Part - for Knowledge Composition and Knowledge Part, from dictionary.com
> on "composition":
> "the act of combining parts or elements to form a whole."
> "the composition of "aircraft" from "air" and "craft."
>
> My reasoning for this is a composition will contain rules, processes,
> decision tables, dsls etc. "The KnowlegeBase is a composition of
> Knowlege Parts".
>
> The XML would look like:
> <composition>
> <part resource="classpath://........" type="DRL">
>
> <part resource="file://........">
> <decisiontable-configuration type="XLS" worksheet-name="blah" />
> </part>
> </composition>
>
> I have not added a resource type attribute, as we will assume it must
> start with protocol. classpath will use ClassPathResource, file will use
> FileSystemResource and anything will be a UrlResource. This would be a
> special KnowlegeType. I may later make the type optional, once we can
> infer the type from the .ext.
> kbuilder.addResource( ResourceFactory.newFileResource(
> "/data/my-knowledge.xml" ), KnowledgeType.COMPOSITION );
>
> What do people think?
>
> Mark
>
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