Why is a flat object recommended?
by Christie, Blair
In the documents this is dicussed briefly:
"). Object models can often have complex relationships and hierarchies
in them - for rules you will want to simplify and flatten the model
where possible, and let the rule engine infer relationships (as it
provides future flexibility."
What does it mean that the rule engine can infer relationships?
Are there performance reasons for having a flat model?
Cheers,
Blair
16 years, 6 months
MySQL and Derby issues with Guvnor
by Sumant Kumar
Hi ,
I have changed the defualt Derby DB to MySQL DB for the JacRabbit in Guvnor. I see this below exception when I try to bring up the JBOSS AS and Guvnor.
Any idea what is the issue
2009-07-30 16:58:09,499 INFO [STDOUT] (main) ERROR 30-07 16:58:09,499 (BundleDbPersistenceManager.java:storeBundle:1270) failed to write bundle: cafebabe-cafe-babe-cafe-babecafebabe
ERROR 23505: The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'SQL090729054055150' defined on 'DEFAULT_BUNDLE'.
Is there a way to get rid of JacRabbit and use more robust Implemenentation of JCR.
16 years, 7 months
impossible to dispose tomcat devloader when i reload context (drools keep reference)...
by Emmanuel GREFFET (France)
Hello
I'm Emmanuel from France. (sorry for my English)
We use drools 4.0.7 in a hospital application.
We load drools and our programs (services) with tomcat Devloader (5.5.9)
We use drools in statefullsession (retract and insert facts by rules in a
ruleFlow).
everything is perfect for us, except a little problem of "dispose" with
tomcat due to drools.
Through the Tomcat console when we try to restart our webapp, tomcat can't
dispose the old Devloader
(in Eclipse we can see that many drools class use class attribute
ClassLoader without any dispose ???)
In production, we used different webapps in a Tomcat, so we can't easely
stop Tomcat, so until we stop tomcat, the reload of the webapps is longer
and longer ... (many devloader(s) can't dispose)...
anyone has had this problem ?
Thank you.
Emmanuel
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16 years, 7 months
Problems with ruleflow
by Femke De Backere
Hi,
I have a problem with an easy Rule flow project (source code included
in this mail). The only thing that should happen is the execution of a
rule flowgroup, but my application ends before executing the group...
Does anybody see the problems? I tried every possible adaptation and
based this problem on a similar, working feverapplication... But is
still doesn't work and I really can't find the problem.
Thx,
Femke
16 years, 7 months
Advice on organizing rules
by glasscat
I'm using drools 5.0.1.
I've written the following rules to retrieve objects from the working
memory. Questions:
1) whether there is a better way to organize the rules. For instance the
rule "checkvalidresponse" right now checks for both successful retrieval and
unsuccessful retrieval. Should I split it to 2?
2) When I do drools.update(response) in the "default" rule, it seems to be
in endless loop.
3) The response value set in "retrieve" rule is not updated when rule
"checkvalidresponse" is triggered. Do I need to do drools.update(response)
in the "default" rule?
4) Should I set the response code in the "retrieve" rule and remove the
"checkvalidresponse" rule?
Thanks
rule "default"
dialect "java"
agenda-group "retrieve"
salience 50
when
Request(sfid : ProductIdentifier)
trdata : Data(Identifier == sfid)
response : Response(product == null)
ServiceResponse(responseCode == 0) from
response.getServiceResponse()
then
response.setProduct(trdata.getProduct());
// should I set response code here or let "checkvalidresponse"
handle it?
// do I need to update here?
// drools.update(response);
end
# Shoud I split this to 2? 1) check for successful query and 2) check for
unsuccessful query?
rule "checkvalidresponse"
dialect "java"
agenda-group "retrieve"
salience 20
when
Request()
response : Response()
sres : ServiceResponse(responseCode == 0) from
response.getServiceResponse()
then
String rname = drools.getRule().getName();
System.out.println("Rule: \"" + rname + "\" triggered");
Product prod = response.getProduct();
// Check if a valid Product found
if ( prod == null ) {
sres.setResponseCode(9);
sres.setResponseMessage("Product not found");
sres.setExceptionCode(9999);
sres.setExceptionMessage("");
} else {
sres.setResponseCode(0);
sres.setResponseMessage("The operation completed
successfully");
sres.setExceptionCode(0);
sres.setExceptionMessage("");
}
response.setServiceResponse(sres);
drools.update(response);
end
# Credentials
# The only valid credential: User Id: User Password: Password
#
rule "checkcred"
dialect "java"
salience 50
when
request : Request()
response : Response()
cred : Credentials(userName != "User" || password != "Password")
from request.getCredentials()
sres : ServiceResponse(responseCode == 0) from
response.getServiceResponse()
then
String rname = drools.getRule().getName();
System.out.println("Rule: \"" + rname + "\" triggered");
sres.setResponseCode(9);
sres.setResponseMessage("Invalid credentials");
sres.setExceptionCode(9000);
sres.setExceptionMessage("");
response.setServiceResponse(sres);
drools.update(response);
end
# Transaction context
# Valid channel: channel01 or channel02
#
rule "checktrctx"
dialect "java"
salience 40
when
request: Request()
response: Response()
ctx : TransactionContext(channel != "channel01" && channel !=
"channel02") from request.getTransactionContext()
sres : ServiceResponse(responseCode == 0) from
response.getServiceResponse()
then
String rname = drools.getRule().getName();
System.out.println("Rule: \"" + rname + "\" triggered");
System.out.println("Invalid transaction context: " +
ctx.getChannel());
sres.setResponseCode(9);
sres.setResponseMessage("Invalid transaction context");
sres.setExceptionCode(9001);
sres.setExceptionMessage("");
res.setResponse(sres);
drools.update(res);
end
rule "requestgood"
dialect "java"
salience 1
when
Request()
response : Response(product == null)
ServiceResponse(responseCode == 0) from
response.getServiceResponse()
then
String rname = drools.getRule().getName();
System.out.println("Rule: \"" + rname + "\" triggered");
System.out.println("Request is good");
drools.setFocus("retrieve");
end
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16 years, 7 months
How to Enrich Facts with Data from a Database
by Ken Archer
I would like to append values to facts in working memory with
values from a database before rules processing. The Fusion documentation
says, “one of the most common use cases for rules is event data enrichment”,
but no documentation seems to explain how this is done whether we’re talking
about events or just plain old facts. And the RHS syntax seems to be
limited to working with data already in working memory. How can I enrich
facts with data from another system? Thanks in advance.
Ken Archer
Telogical Systems
16 years, 7 months
Problem Sharing rules between Rule Flow group
by surya_n2007
Using 4.0.7 version
Our requirement is we need to share rules between different projects. So we
have grouped the rules into ruleflow group say Group A has 2 rules, GroupB
has 4 rules.Shared GroupB i.e 4 rules in different projects X,Y. Now the
business requirement changed for project Y in GroupB one of the rule doesnt
satisfied.
Solution : Divide the rule flow groupB into GroupB 3 rules ,Group C 1 rule
but we need to test both the projects we dont want to do that .
Please let me know any other solution ? Can a rule be part of different rule
flow groups as shown below.
rule "Rule3" ruleflow-group "GroupB,Group X"
Cheers
Surya.
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16 years, 7 months
How to define an Enumeration when using "Guided Editor" in Eclipse?
by data data
Hi all
Probably a simple question, but I did not find any hint on this topic.
I am using drools 5.0 in eclipse. There I started to write "business rules"
with the "guided editor". Now I like to introduce some enumeration for some
attributes in my model. In the web based version "Guvnor" is this no big
deal, there you have the option to add new "enumerations". But how can you
achieve the same thing in eclipse? I studied the "package" file syntax, but
there I found no such option (or it is not documented).
Any suggestions and hints?
Many thanks for your help in advance.
regards
Mark
16 years, 7 months
