Re: [rules-users] unmarshal global variable
Thanks for the response. The first rule table in the spreadsheet
(kinda) looks like this:
RuleTable Constants
NAME CONDITION ACTION ACTION
eval(! productPricer.isConstantsSet($1) )
productPricer.setConstant($1, $2);
productPricer.setConstantsSet($1);
Rule Name Set?
ProductName TRUE "NAME", "Champion CL"
DefaultCost TRUE "COST", "80000"
DefaultPrice TRUE "PRICE", "100000"
DefaultLength TRUE "LENGTH", "53"
Done TRUE TRUE
The first rule generated looks like this:
rule "ProductName"
when
eval(! productPricer.isConstantsSet() )
then
productPricer.setConstant("NAME", "Champion CL");
end
Alex
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: Monday, January 07, 2013 11:22 AM
To: Rules Users List
Subject: Re: [rules-users] unmarshal global variable
The crucial info is: what is in the first table, how do you insert this
data?
Is it a DRL global? A fact? How does the (generated) rule look like?
-W
On 07/01/2013, acormond <acormond(a)greatdanetrailers.com> wrote:
Gentlepeople,
I am fairly new to Drools and have what I hope is a simple question.
I am
attempting to marshal (serialize) a Drools knowledge session and
then
unmarshall it. The marshalling works but the unmarshalling fails with
a
null pointer exception. The error is apparently with unmarshalling
a
global
variable in the session.
The session is created from a spreadsheet (decision table). This
spreadsheet
has two RuleTables. The first of these exists solely so that I can
enter
some
constants into the session, specifically the name and price of the
product
the
spreadsheet is dealing with. The second ruletable is where the rules
are
specified. The exception occurs when unmarshalling the first rule in
the
first
rule table. If, as a test, I eliminate the first rule table, then I
can
successfully marshal and unmarshall the session.
The marshalling is done using the following, simplified, code:
Marshaller marshaller = MarshallerFactory.newMarshaller(kbase);
File droolsSessionFile = new File(MARSHAL_FILE);
foStream = new FileOutputStream(droolsSessionFile);
baos = new ByteArrayOutputStream();
marshaller.marshall(baos, ksession);
baos.writeTo(foStream);
and the unmarshalling is done like this:
Marshaller marshaller =
MarshallerFactory.newMarshaller(pricingProcessor.getKnowledgeBase());
FileInputStream fis = new FileInputStream(MARSHAL_FILE);
StatefulKnowledgeSession ksession = marshaller.unmarshall(fis);
So, where did I go wrong? Perhaps I need to deal with the global
variable
differently, perhaps by putting it in the knowledgeBase before I
unmarshall
the session?
Thank you for any help.
Alex Ormond
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