Guvnor and drools implementation - questions
by ioda100
Hi,
i have a few questions :
1) my facts are in fact java Maps, is there an easy way to deal with them in
guvnor? it's not like in the example where facts are objects and we give
guvnor the Pojo model to know what we can do with it
for example i have :
$m : Map((this["attribute1_of_the_map"] == "test1"))
How to deal with the map and have a prepopulated list of properties of the
map? And to store it in the variable $m. Without using the "free from drl"
where we have to write it by hand.
2) how to deal with global constant with guvnor?
i have something like :
WorkingMemory wm = drools.getWorkingMemory();
wm.setGlobal("resultValue", "OK");
Is it a direct way to play with global constant in Guvnor? Without using the
"free from drl" where we have to write it by hand.
3) for stopping firing rules after one rule fire successfully, do you know
if there is an option to do that?
For now i insert a boolean in the session and the first condition in all my
rules is that this boolean is there. When a rule fires successfully, i
retract it. I suppose there is a bettre way to do it?
Thanks in advance for your help
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15 years, 1 month
EvalConditionNode cannot be cast to org.drools.reteoo.RightTupleSink
by nanic23
We are seeing this exception when trying to complete flows in wait state.
This happens after we deploy a newer release of our application.
Context:
1. we start several process that go to wait state
2. we make bug fixes to our application and deploy a new version
3. we try to resume the existing flows that are in wait state.
4. we get this exceptions when trying to load existing session
NOTE: drools version is the same so I don't think this is a serialization
incompatibility issue.
Exception:
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedConstructorAccessor622.newInstance(Unknown Source)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at
org.drools.persistence.jpa.impl.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:95)
... 202 more
Caused by: java.lang.RuntimeException: Unable to load session snapshot
at
org.drools.persistence.session.JPASessionMarshallingHelper.loadSnapshot(JPASessionMarshallingHelper.java:96)
at
org.drools.persistence.session.SingleSessionCommandService.initKsession(SingleSessionCommandService.java:202)
at
org.drools.persistence.session.SingleSessionCommandService.(SingleSessionCommandService.java:165)
... 206 more
Caused by: java.lang.ClassCastException: org.drools.reteoo.EvalConditionNode
cannot be cast to org.drools.reteoo.RightTupleSink
at
org.drools.marshalling.impl.InputMarshaller.readRightTuple(InputMarshaller.java:401)
at
org.drools.marshalling.impl.InputMarshaller.readRightTuples(InputMarshaller.java:391)
at
org.drools.marshalling.impl.InputMarshaller.readFactHandles(InputMarshaller.java:326)
at
org.drools.marshalling.impl.InputMarshaller.readSession(InputMarshaller.java:205)
at
org.drools.marshalling.impl.DefaultMarshaller.unmarshall(DefaultMarshaller.java:91)
at
org.drools.persistence.session.JPASessionMarshallingHelper.loadSnapshot(JPASessionMarshallingHelper.java:91)
... 208 more
Thanks,
Nick
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15 years, 1 month
Drools command line interface
by Diego López León
Hi ppl,
in my spare time I've been working on a tool that may be of interest
to some of you.
I call it Drools Shell.
"The aim of this project is to provide a simple command line interface
to test rules allowing you to insert, modify and retract facts. You
also have commands to query the state of the stateful knowledge
session running behind the shell." (quoted from README.md)
You can clone it from github
https://github.com/diega/drools-shell
Take a look at the fancy readme below that page. If you'd like to
help, there are some items already loaded in the issues section.
Any feedback is welcome :)
--
diego
15 years, 1 month
Is it possible to Iteriate over a list of string values ?
by groovenarula
Hello all,
In one of my use cases, I need to insert a variable collections of facts
into working memory in order to be able to test for those values later :
So I was wondering if there's a way to do something like this
when
$vals : String() from [ "A 12345", "B 45678", "C 8695" ]
then
insert ( new Fact ( $vals ) );
With the intention that the rule will fire 3 times and insert the 3 new
facts with the values " A 12345" and "B 45678" and "C 8695".
Is this possible using rules or do I have to resort to using functions. The
problem I'm trying to overcome is to see if there's a way to get the "A
12345", "B 45678", "C 8695" from a single cell of a spreadsheet.
Thanks in advance,
G
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15 years, 1 month
New to Drools. Is it possible to test inverse conditions?
by Manuel Ortiz
- Dear all:
My name is Manuel Ortiz, a very beginner in Drools, and have a question
related to Multi Restriction on Condition Elements.
In
http://downloads.jboss.com/drools/docs/5.1.1.34858.FINAL/drools-expert/ht...,
it can be found the following example:
*Example 4.52. Multi Restriction*
// Simple multi restriction using a single &&
Person( age > 30 && < 40 )
// Complex multi restriction using groupings of multi restrictions
Person( age ( (> 30 && < 40) ||
(> 20 && < 25) ) )
// Mixing muti restrictions with constraint connectives
Person( age > 30 && < 40 || location == "london" )
I need to test a multi restriction in a rule and the opposite restriction in
another. The multi restriction will be given by the user, and the
application will build rules which test both the original restriction and
the opposite. I would like to know if it is possible to write a Drools rule
which evals the opposite conditions based on the original, something like
Person( !(age > 30 && < 40) )
or I have to rebuild the multi restriction, something like
Person( age <= 30 || >= 40 )
Thank you in advance for your time.
Kind regards,
Manuel Ortiz
15 years, 1 month
maven-drools-plugin, anyone?
by Ansgar Konermann
Hi,
I prepared a tiny drools compiler plugin for Maven 3. It currently
contains the smallest feature-set which is potentially useful for my
colleagues at work, so up to now it's no more than a starting point for
my team. Nevertheless, I invite you to take a look at it, comment on it
and suggest features _you_ would like to see in the plugin in one of its
future releases.
There's some inital documentation here:
http://passion.forco.de/content/maven-drools-plugin
Looking forward to your comments.
Best regards
Ansgar
15 years, 1 month
join gateway
by Salina Fung/UFL - ICIL
Please give me some example to illustrate the difference between
'XOR', 'Discriminator', 'n of m'?
And my understanding of 'And' should be waiting for ALL incoming branches are completed
before move to the next node, is it correct? So, if I have 2 incoming branches are
from 2 human task, and the out-going branch is to an END node, if only one human
task is finished, the process will not be ended, until the second one is completed by user.
Is it correct?
Thanks
Salina
15 years, 1 month
Need Help writing then part in DSLR
by Saleem Lakhani
Hi,
This is what used to work in Drools 3: Sample from DSL:
[then]A validation error has occurred=ValErrTO valErrTO = new
ValErrTO(); java.util.HashMap variableMap = new java.util.HashMap();
[then]- The standard error level is "{standard_error_level}"=int
stdErrLevel={standard_error_level}; valErrTO.setErrorCode(stdErrLevel);
With Drools 5.2.1 it gives me the following error:
No modify was found to add the modifier to: - The standard error level
is "400"
How do I write the above 2 statements again in Drools 5.2.1, NOTE: I
need to write this in DSL.
Sample DSLR:
rule "Your First Rule"
when
There is a Coverage with
then
#actions
A validation error has occurred
- The standard error level is "400"
end
Thanks,
saleem
15 years, 1 month
New Questions about drools
by Carlos Santiago Moreno
Hi There! I have been reading some more about Drools, Guvnor, and JBPM5, and
I have a few new doubts, that I couldn't get solved from the documentation I
read. And here they are:
1) When rules are entered through the UI are they immediately added to the
rule base?
2) Does the edit UI require code to define new entities and associated
metadata?
3) What would our interface look like if we called it as a service for only
rule evaluation?
4) What is the rule scoping mechanism. That is, how do I say "evaluate this
set of information against
ruleset Q"?
5) I'm concerned about the "then" clause. It looks like it is always code.
If our "then" always consists of
assignments to some set of variables or parameters, what does the person
writing rules see?
6) Can I define a new workflow and connect it into some dispatcher for
invokation without writing any code and without stopping or upgrading the
app?
Thanks for your help.
Carlos S. Moreno
15 years, 1 month
not sure if this is a bug of drools or my bad usage...
by Simon Chen
Hi all,
An interesting finding:
I have three simple rules:
rule "A2B"
when
A()
then
insertLogical(new B());
end
rule "B2C"
when
B()
then
insertLogical(new C());
end
rule "C2B"
when
C()
then
insertLogical(new B());
end
Basically, once we have an A(), we'll logically insert a B(). Once we
have a B(), we'll logically insert a C(). Once we have a C(), we'll
logically insert a B().
So, I first insert an A(), print all the objects. Retract A(), and
print all the objects. Here's what I got:
com.sample.B@42
com.sample.C@43
com.sample.A@548997d1
after retract!
com.sample.B@42
com.sample.C@43
So, B() and C(), which should be logically depend on A(), somehow are
not retracted. The problem I see is the truth maintenance system allow
B() and C() to depend on each other, thus not affected by losing A().
Is this a bug or my bad usage?
Thanks.
-Simon
15 years, 1 month
