[rules-users] Implementaion of Rule Flow in Guvnor

[Jaroslaw Kijanowski]

Hi Ambika,
  your rules in the first rule flow group "MasterHud" set a new value on 
a fact's field.
Then you expect that your rules in the second rule flow group fire.
The rule engine has no idea that some facts' fields changed until you 
let the engine know via update();

Open your MasterHud decision table and edit the action column (check the 
'Update engine with changes:' check box), build the package and enjoy.

Cheers,
  Jarek

Ambika Goel wrote:
> Hi All,
> 
>  
> 
> I have attached the Guvnor repository and the java code that I am using 
> to run a ruleflow.
> 
>  
> 
> The two tables /‘MasterHud’/ and /‘FeeCalc’/ are decision tables made in 
> Guvnor.
> 
>     * /MasterHud/ decision table is used to get the /hudLineNumber/
>       based on /lienPosition/ and /productType/.
>     * /FeeCalc/ table is used to get the fee based on /hudLineNumber/.
> 
>  
> 
> I have created a ruleflow ‘/Fee.rf’/ which connects these two tables.
> 
> Below is the code I use to call /Fee.rf/:
> 
>  
> 
> public static void  main(String args[]){
> 
>                         try{
> 
>                                     KnowledgeBase kbase = 
> readKnowledgeBase();
> 
>                                     StatefulKnowledgeSession ksession = 
> kbase.newStatefulKnowledgeSession();
> 
>                                    
> 
>                                     LoanDetail l = new LoanDetail();
> 
>                                     l.setLienPosition("Second Lien");
> 
>                                     l.setProductType("ABC");
> 
>                                     ksession.insert(l);
> 
>                                    
> 
>                                     ksession.startProcess("hudRule");
> 
>                                     ksession.fireAllRules();
> 
>                                    
> 
>                                     System.out.println("Hud Line Number: 
> " +l.getHudLineNumber());
> 
>                                     System.out.println("Fee: " +l.getFee());
> 
>                                    
> 
>                             ksession.dispose();  
> 
>                         }catch(Throwable t){
> 
>                                     t.printStackTrace();
> 
>                         }
> 
>             }
> 
>             private static KnowledgeBase readKnowledgeBase()throws 
> Exception{
> 
>                         KnowledgeBuilder kbuilder = 
> KnowledgeBuilderFactory.newKnowledgeBuilder();
> 
>                         kbuilder.add( 
> ResourceFactory.newUrlResource("http://localhost:8080/guvnor/org.drools.guvnor.Guvnor/package/com.example/LATEST"),ResourceType.PKG);
> 
>                         
> kbuilder.add(ResourceFactory.newClassPathResource("Fee.rf", Test.class), 
> ResourceType.DRF);
> 
>                         KnowledgeBuilderErrors errors = 
> kbuilder.getErrors();
> 
>                         if(errors.size()>0){
> 
>                                     for(KnowledgeBuilderError error : 
> errors){
> 
>                                                 System.err.println(error);
> 
>                                     }
> 
>                                     throw new 
> IllegalArgumentException("Could not parse knowledge.");
> 
>                         }
> 
>                        
> 
>                         KnowledgeBase kbase = 
> KnowledgeBaseFactory.newKnowledgeBase();
> 
>                         
> kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
> 
>                         return kbase;
> 
>             }
> 
>  
> 
> *When I run this code, I get the Hud Line Number as **801** but the fee 
> displayed is **0.0***
> 
> *The expected output is Hud Line Number as **801 **but the fee displayed 
> as **450.*
> 
> * *
> 
> *There is no exception but I don’t get the desired output.*
> 
>  
> 
>  
> 
> ------------------------------------------------------------------------
> 
> *From:* Ambika Goel
> *Sent:* Monday, October 12, 2009 1:09 PM
> *To:* 'rules-users at lists.jboss.org'
> *Subject:* Implementaion of Rule Flow in Guvnor
> 
>  
> 
> I am using the following code to add to knowledge builder and run it:
> 
>  
> 
> knowledgeBuilder.add(ResourceFactory.newClassPathResource(“QueueFlow.rf”, 
> GuvnorTest.class), ResourceType.DRF) // ruleflow
> 
> knowledgeBuilder.add(ResourceFactory.newUrlResource(“http://...”), 
> ResourceType.PKG) // guvnor package
> 
>  
> 
>  My rule flow is connection of two tables. I set a property in action of 
> one decision table and use it as a condition in another decision table 
> to get the desired result.
> 
>  
> 
> If I run the above code, I don’t get any exception but the output is 
> ‘null’.
> 
> 
> ------------------------------------------------------------------------
> 
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