Clarification regarding .drl file
by Sarath Kumar Daruru
Hi,
I'm new to Drools engine. I'm developing small application related to Insurance domain. I've defined my own rules to process the policy.
I have defined 5 rules in my application. I have small question here regarding rules file. Below is my drl file
rule "1 Policy Validation"
salience 1
when
Claims($claimPolicyID : policyID != "abc1234" && message == "A",$claimPolicyID1 : policyID );
$c : Claims (message == "A");
then
modify( $c ) {
setMessage("Entered wrong Ploicy Number "+$claimPolicyID1+" \n")
}
end
rule "2 Claims Validation"
salience 2
when
Claims($claimAmt : amount >=10000 && message =="B");
$c : Claims (message =="B");
then
modify( $c ) {
setMessage( "You are entered more than policy allocated amount. Plese enter correct amount \n" )
}
end
rule "3 Hospital Days Validation"
salience 3
when
Claims($claimHospitalDays : claimsHospitalStayeddays > 10 && message == "C");
$c : Claims (message =="C");
then
modify( $c ) {
setMessage( "You entered more nithgs than the maximum permitted "+ $claimHospitalDays +" days, this is more nights than the maximum permitted by the policy \n")
}
End
Problem: All rules are firing once I will give workingMemory.fireAllRules();
Here my doubt is how can I exit from rule file once my rule1 fire or rule 2 fire. I don't want to file all rules in .drl file. Once the rule is satisfy then I need to exit from .drl file.
Can you please give me the solution?
Ahead Together,
Sarath Kumar Daruru
Associate Technical Lead - (TEG) | BlueAlly (A Megasoft Division)
Megasoft Limited| 6-3-1192/2/1| Kundanbagh| Begumpet| Hyderabad-16|
Phone: +91 40 4033 0000 Extension 8175
Mobile: +91 994 999 3152
Email: sarathd(a)blueally.com<mailto:sarathd@blueally.com>
17 years
Drools API improvement sugestion
by Zoltan Farkas
Based on current implementation, the following methods I think should
throw a exception, something like:
ResourceNotFoundException
org.drools.compiler.PackageBuilder.addKnowledgeResource()
org.drools.builder.impl.KnowledgeBuilderImpl.add()
another option might be to verify the validity of a Resource object at
creation time and make ResourceFactory factory methods throw
ResourceNotFoundException.
I believe the case of a "not found resource" the user of the api should
be "ecouraged" to handle.
Another case that might be needed to be handled could be
InvalidResource?
Let me know what you guys think
Regards
--zoly
17 years
Automatic handling of relationships
by Mark Proctor
I thought of a simple, yet powerful idea, anyone want to give this ago?
It will be the start of making ontologies more sanily usable for java
developers.
Person
@relation(name="OwnerPetRelation", verb="IsOwnerOf")
Set<Pet> pets;
Pet
@relation(name="OwnerPetRelation", verb="IsOwnedByf")
Person owner;
IsOwnerOf and IsOwnedBy do not live on the classpath. The engine detects
those annotations and generates them as internal classes. Or actually it
can be one class, where it's able to use the two keywords to reference
that class in either direction. When you insert your Persons and Pets,
the relations are automatically inserted too (assuming there are rules
that use them). This allows people to more naturally explore the
relational aspect of their data, without having to create and insert the
relations themselves. Once a Relation is being maintained by the engine,
any updates to the underlying collection will result in relations being
added and removed.
If we build in relation inferrence, to avoid the extra binding, it would
mean that by simply annotating their classes people can do the following
(Assuming Cat is a type of Pet):
When
Person( location == London ) IsOwnerOf() Cat( color == "Tabby")
....
The above will get all my london people and their tabby cats. The simply
placement of the IsOwnerOf() pattern, would be nice if () was optioal,
would constrain the Cat to those related to the Owner. i.e. the short
hand equivalent of:
$p : Person( location == London ) IsOwnerOf( owner == $p, $c : Cat )
Cat( this == $c, color == "Tabby")
I think that's powerful and provides for a hyrbid OO and Relational
modelling approaches, asthey can still use graph notation:
person.pets[0].color == "tabby"
This also solves the question that people always ask, how do I insert my
collection. With that in place there would still be plenty more to do,
like constraints, but it would be a start to improving Drools'
relationahip programming "out of the box" capabilities. So who's game?
Mark
17 years
drools-process-enterprise - JPAPersisterManager should take EntityManagerFactory as an input parameter
by Michal Bali
Hi Kris,
The JPAPersisterManager is currently creating a new EntityManagerFactory.
It should probably also take an EntityManagerFactory as an input. This is
necessary if you already have an EntityManagerFactory in your application
you want to reuse it. Two EntityManagerFactories mean two transactional
resources that have to be managed by a distributed transaction and that is
unnecessary.
If you want I should be able to provide the patch. It should be a simple
constructor change :).
I hope I am not starting to bother you with my issues, I might have a few
more :)
Thank you.
Best Regards,
Michal
17 years
