[rules-users] unmarshal global variable

[Ormond, Alex C. (GDLP)]

Many thanks to all who responded.

Wolfgang, I assume you provided the answer.  Thank you, I'll give it a
shot.

Yes, the rule works separate of marshalling.  I can believe there's a
better way to get constants into the session from a spreadsheet, but
this is the only way I could get to work.

Yes, I did declare "variables" in the spreadsheet.

Cheers to all,

Alex


-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: Monday, January 07, 2013 12:44 PM
To: Rules Users List
Subject: Re: [rules-users] unmarshal global variable

A DRL global is not marshalled /unmarshalled along with the session.
You'll have to marshal/unmarshal this object separately, and setGlobal
it again in the restored session.
-W

On 07/01/2013, Ormond, Alex C. (GDLP) <ACOrmond at greatdanetrailers.com>
wrote:
> 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 at lists.jboss.org
> [mailto:rules-users-bounces at 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 at 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
>>
>>
>>
>>
>> --
>> View this message in context:
>>
>
http://drools.46999.n3.nabble.com/unmarshal-global-variable-tp4021375.ht
> ml
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
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