Data Modeling for medical expert system
by Dirk Conzelmann
Hi everybody,
I am using Drools as a part of my Bachelor Thesis.
My job is to build an expert system for medical diagnoses.
My Question:
Is there a best practice known in modeling a variable
list of questions and answers in Drools?
Up to now I modeled the list of questions implementing
Java Classes and Enums for each question/answer pair.
But to be able to change those options easyly I need
a higher abstraction level than simple Java Classes and Enums.
Could someone show me an example how to implement this?
I hope I have explained my question understandable :)
--
Dirk Conzelmann
IT-Services
Telefon: +49.179.2237995
Email: info(a)dirk-conzelmann.de
Web: www.dirk-conzelmann.de
14 years, 10 months
Security test cases for Drools
by kapokfly
Not sure if anyone can share their experiences what kind of test cases on
Drools security should be developed and ensured?
As the rule is just a piece of codes in String format which can be hooked
into JVM, we can assume that might open some holes and necessary security
test cases need to be designed against.
Anyone can share their experiences on this?
Thanks...
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14 years, 10 months
rule does not fire at first event
by ukriegel
Hi there,
we use drools fusion 5.3. Final.
In a drl-file, a fact and an event and the following rules are declared
package ... etc
declare ActivityState
@role(fact)
state : StateType
end
rule "set initial state"
dialect "java"
salience 100
when not (exists KFActivityState())
then
ActivityState $actState = new ActivityState();
$actState.setState(StateType.STANDBY);
insert($actState);
System.out.println("ActivityState inserted "+ new Date());
end
declare Command
@role (event)
end
rule "request information"
dialect "java"
when Command(commandType == CommandType.REQUEST_INFORMATION) from
entry-point "XXX"
$s: ActivityState(state == ComponentStateType.ACTIVE||state ==
ComponentStateType.PASSIVE||state == ComponentStateType.STANDBY)
then
System.out.println("Send Report");
end
The rule request information doesn't fire with the first command event, but
from the second one it fires always.
What's wrong with my code?
Thanks in advance
Ulrich
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14 years, 10 months
Re: [rules-users] Where in DB does Guvnor store "description" of rules?
by GPatel＠tsys.com
Take a look at the guvnor rest api
----- Original Message -----
From: Praveen [praveen.sanju(a)gmail.com]
Sent: 11/08/2011 02:11 AM PST
To: rules-users(a)lists.jboss.org
Subject: [rules-users] Where in DB does Guvnor store "description" of rules?
Hi,
Our application expects rule name and its description to be displayed in the
UI and both of
these are to be retrieved from DB.
We are aware that Guvnor stores rules in DB, not sure of the description
part.
If someone could throw light on how to get description/comments (that was
entered through Guvnor)
in UI would be great.
Initially we had the idea of parsing comments in drl.
However we saw that the description entered through Guvnor while writing a
rule does not show up in the generated source code.
TIA.
Regards,
Praveen.
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14 years, 10 months
variables confusion Java/MVEL
by elsdestickere
Hi,
I'm confused about when en where to use Java or MVEL in a rule.
In the example below I want to replace "
openRes.getMasterExemplaar().getBruikbareExemplaren()" with a variable.
RHD: works with JAva expression:
List<Exemplaar> bruikEx =
openRes.getMasterExemplaar().getBruikbareExemplaren();
but I prefer to create the variable in the LHS, but Java doesn't work here.
Should this be a MVEL expression or should JAVA allways be possible?
rule "GarandeerReservaties"
when
garRes : GarandeerReservatieTaak();
openRes : Reservatie() from
repFact.getReservatieRepository().findVandaagOpenstaandeReservaties();
List<Exemplaar> bruikEx
=openRes.getMasterExemplaar().getBruikbareExemplaren();
eval(Reservatie.getVandaagOpenstaandeReservaties().size() > 0 &&
openRes.getMasterExemplaar().getBruikbareExemplaren().size() != 0)
then
//List<Exemplaar> bruikEx =
openRes.getMasterExemplaar().getBruikbareExemplaren();
bruikEx.get(0).setStatus(ExemplaarStatus.MOMENTEEL_GERESERVEERD);
openRes.setStatus(ReservatieStatus.GEGARANDEERD);
System.out.println( "Drools "+drools.getRule().getName()+": ocr:
"+openRes.getAantalVandaagOpenstaandeConcurReservaties() + " bruikex: "
+bruikEx.size() );
end
(written in Dutch, but I think it will be ok to understand)
br,
Els
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14 years, 10 months
Enumerations for nested classes
by gab
Hi all,
I have a problem with data enumeration for nested classes in BRLs.
I have two classes, Promotion and Program. Promotion has a property named
"program" of type Program, which has a string property called "code".
I did a couple of enumeration in this way:
[Program.code] = ['ABC=First Program','XYZ=Second Program']
[Promotion.program.code] = ['ABC=First Program','XYZ=Second Program']
With decision table they work as expected, but in BRL rules only the first
works (the one with no nested classes), while in the other case the
drop-down list doesn't appear and it's shown only a free editable field.
How can it be? Should I write something in a different way? Is it a bug?
I'm using version 5.2.
Thanks in advance.
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14 years, 10 months
How to write Drools rule basing on a changed property?
by kapokfly
Requirement:
1)
Rule
When
Person.address.address1 is changed
THEN
2) Ideally we should have 2 objects, 1 for the old person instance, the
other for the new person instance so contextually the LHS equals to
oldPerson.address.address1 != newPerson.address.address1.
A properties change listener might not be the best solution as it might span
multiple calls and the property change could be done on the web layer which
is out of the JBoss Drools knowledge session.
Ivan
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14 years, 10 months
Rule Flow: Diverge/Converge Issue with one-to-many paths being exected
by dcrissman
Drools Version: 5.1 (We are looking into upgrading, but not an option at this
time)
I have need of a rule flow that will allow a diverge on one-to-many paths
and then converge and continue on only once the paths that were executed
have all finish.
Say I have path A, B, & C. The constraints on the diverge node indicate that
A & C should be executed simultaneously, but B should not. Then the converge
node should wait for A and C to finish, but not care about B as it was not
executed by the diverge.
Initial attempt was to use Diverge(OR) and Converge(AND). The problem is
that the Converge (I think) waits on B indefinitely and so the process exits
out with no error message.
It looks like n-of-m is kind of what I want, except I have no way to know
how many paths the Diverge kicked off.
Any thoughts on how this could be done?
Much Appreciated!
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14 years, 10 months
