[rules-users] How to Access Rule RHS (THEN Part) from JAVA?

[Wolfgang Laun]

You cannot access any variable declared between 'then' and 'end'.
These are local in the same sense as a variable declared in a Java
method.

For passing anything computed in a rule consequence to the embedding
Java program you might

* insert a Fact of some suitable type and retrieve this from the
ksession using API methods, e.g., by running a query, or by calling
Collection<Object> getObjects(ObjectFilter filter) )

* define a global and simply assign to it in the consequence, and
retrieve it using ksession API Object getGlobal( String identifier )

-W


On 13/07/2012, Ravikiran <ravikiran.kakarla at gmail.com> wrote:
> Hi Drools Gurus,
>
> One more newbie here for Drools Guvnor. I have chosen
> "guvnor-distribution-5.3.0.Final" (I could see version as SNAPSHOT 5.4.0
> within Guvnor-->Administration-->About) to start with. After reading
> through
> the complete user manual, I was able to setup and deploy Drools Guvnor war
> in JBoss AS 7.
>
> My intension is to access all the rules that i have created using Guvnor
> web. I have written a java test case to access my Rules which are resided
> in
> a drools Package using REST API. I was successful to access them using
> standard Authentication mechanism with charset*.xml. Even though i was able
> to call fireAllRules with specific rule using "AgendaFilter" provided. But
> i
> was not able to access the values at RHS after a specific rule got fired.
> For Example, i want to access "percent value as 2.5" after the below sample
> rule is successfully executed,
> I have uploaded my model jar to Guvnor containing Person & LoanFormula
> classes.
>
> ---Rule 1 (please do not see the syntax errors)
> WHEN
>  Person age > 25
>  ----
> THEN
>  LoanFormula percent = 2.5
>  ....
>  ....
>
> JAVA Code follows
> ---------------------
> KnowledgeBase kbase = ...
> FactType personType = kbase.getFactType( "org.drools.examples","Person" );
> Object bob = personType.newInstance();
> personType.set( bob, "name","Bob" );
> personType.set( bob,"age",42 );
> StatefulKnowledgeSession ksession = ...
> ksession.insert( bob );
> AgendaFilter filter = new ......("Rule1");
> int count = ksession.fireAllRules(filter);
> String name = personType.get( bob, "name" );
> int age = personType.get( bob, "age" );
>
> It would be great help if some one can show me the sample code for
> accessing
> RHS part of the Rule. Please let me know if you need more details.
>
> thanks
> Kiru
>
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> Sent from the Drools: User forum mailing list archive at Nabble.com.
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