[rules-users] Knowledge Base and Guvnor
Dean Whisnant
dean at basys.com
Thu Jan 6 15:01:14 EST 2011
A bit of a follow-up on this:
When I build the package inside of Guvnor it shows me the following on the package build screen:
Last Modified:
Wednesday, January 05, 2011 12:22:25 PM
Last contributor:
admin
Date created:
Wednesday, January 05, 2011 12:15:42 PM
Show package source:
Show package source
URL for package documentation:
http://vmjboss:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/A_RDR_v9/LATEST/documentation.pdf
[cid:image001.gif at 01CBADB2.904201E0]
URL for package source:
http://vmjboss:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/A_RDR_v9/LATEST.drl
[cid:image001.gif at 01CBADB2.904201E0]
URL for package binary:
http://vmjboss:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/A_RDR_v9/LATEST
[cid:image001.gif at 01CBADB2.904201E0]
URL for running tests:
http://vmjboss:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/A_RDR_v9/LATEST/SCENARIOS
[cid:image001.gif at 01CBADB2.904201E0]
Change Set:
http://vmjboss:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/A_RDR_v9/LATEST/ChangeSet.xml
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Status:
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In the example below you showed how I could use the .drl, but is there an advantage for me to directly use the package here? Or say I create a package snapshot and it gives me the following url
http://vmjboss:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/A_RDR_v9/20110106
Does using this package decrease the runtime inside of my app because Guvnor has pre-built the tables?
If so, based on the example below, how would I implement using something like this package snapshot? Would it be as simple as:
final String STANDARD_URL= http://vmjboss:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/A_RDR_v9/20110106;
and then
kbuilder.add( standardUrlResource, ResourceType.PKG);
leaving all other lines the same?
Thank you!
Dean Whisnant
From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Michael Anstis
Sent: Tuesday, January 04, 2011 3:31 AM
To: Rules Users List
Subject: Re: [rules-users] Knowledge Base and Guvnor
Hi,
You should be able to use the URL syntax with KnowledgeBuilder as follows:-
final String STANDARD_URL = "http://your-guvnor-instance-host/org.drools.guvnor.Guvnor/package/standard/LATEST.drl";
final String CUSTOMER_URL="http://your-guvnor-instance-host/org.drools.guvnor.Guvnor/package/customer/LATEST.drl";
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
UrlResource standardUrlResource = (UrlResource)ResourceFactory.newUrlResource(STANDARD_URL);
standardUrlResource.setBasicAuthentication("enabled");
standardUrlResource.setUsername("xyz");
standardUrlResource.setPassword("abc");
UrlResource customerUrlResource = (UrlResource)ResourceFactory.newUrlResource(CUSTOMER_URL);
customerUrlResource.setBasicAuthentication("enabled");
customerUrlResource.setUsername("xyz");
customerUrlResource.setPassword("abc");
kbuilder.add( standardUrlResource, ResourceType.DRL);
kbuilder.add( customerUrlResource, ResourceType.DRL);
assertFalse( kbuilder.hasErrors() );
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
I don't think you'd need to (or want to) create two KnowledgeBases: You could ensure "standard" rules are applied first by any of Drools' agenda controls; i.e. salience, agenda-group or ruleflow; plus sharing a single KnowledgeBase ensures rules in both packages that share patterns are optimissed in the RETE network.
Use of ChangeSet could make things a little simpler too (rather than the individual UrlResources).
Cheers,
Mike
On 3 January 2011 20:03, Dean Whisnant <dean at basys.com<mailto:dean at basys.com>> wrote:
Hi all, thank you for all the help in the past.
I'm to a point in my project of implementing Guvnor built packages into my java code that calls drools.
In the past I used the simple solution of building the knowledge agent on a .drl file as follows:
//Setup the knowledge session for drools
private static KnowledgeBase readKnowledgeBase() throws Exception {
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory
.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("Standard837P.drl"),
ResourceType.DRL);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError error : errors) {
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse knowledge.");
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
return kbase;
}
A little background before the question. My project includes one set of rules that are standard business logic, we'll call that STANDARD for now and one set of rules that any one of my 45 customers could have created, we'll call CUSTOMER, on our common guvnor server. My java code knows which customer is running the app, so determining which two packages I want to fire is simple. The part that is not as straight forward for me is how I then I migrate using the guvnor urls in my above code.
I thought it would be as easy as to replace "Standard837P.drl" above with the STANDARD url and create a second add that would use the CUSTOMER url.
I also want all of my STANDARD rules applied before my CUSTOMER rules are applied. This got me thinking that I need to have two independent knowledge bases running so that I fire all in the first and then fire all in the second.
Backing up a bit again, my application looks through an incoming file inserting facts into the knowledge base for one medical claim line item, fires rules, writes out results to a database, and then moves on to the next claim line item in the file.
1) What would the syntax need to be to implement the STANDARD and CUSTOMER urls?
2) Would I need to create two independent knowledge bases?
3) DO you see any performance issues in this arrangement?
Thank you!
Dean
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