[rules-users] why loop fire with no-loop is true?

[Salaboy]

The no loop goes inside each rule

- Ing. Mauricio Salatino -

On Nov 29, 2009, at 6:00 AM, Sinboy Zhang <iamsinboy at gmail.com> wrote:

> i expect the result is 530,and define the "no-loop=true" in the  
> rules ,but result is 460,why?
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> --------------------------------------------------------------------
> my java test code:
>
> package org.sample;
>
> import org.drools.KnowledgeBase;
> import org.drools.KnowledgeBaseFactory;
> import org.drools.builder.KnowledgeBuilder;
> import org.drools.builder.KnowledgeBuilderError;
> import org.drools.builder.KnowledgeBuilderErrors;
> import org.drools.builder.KnowledgeBuilderFactory;
> import org.drools.builder.ResourceType;
> import org.drools.io.ResourceFactory;
> import org.drools.logger.KnowledgeRuntimeLogger;
> import org.drools.logger.KnowledgeRuntimeLoggerFactory;
> import org.drools.runtime.StatefulKnowledgeSession;
>
> public class SalesTest {
>  public static final void main(String[] args) {
>   try {
>    // load up the knowledge base
>    KnowledgeBase kbase = readKnowledgeBase();
>    StatefulKnowledgeSession ksession =  
> kbase.newStatefulKnowledgeSession();
>    KnowledgeRuntimeLogger logger =  
> KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "test");
>    // go !
>    Sales message = new Sales();
>    message.setName("sinboy");
>    message.setSales(600);
>    ksession.insert(message);
>    ksession.fireAllRules();
>    //ksession.dispose();
>
>    System.out.println("updated:"+message.getName() 
> +","+message.getSales());
>    logger.close();
>   } catch (Throwable t) {
>    t.printStackTrace();
>   }
>  }
>  private static KnowledgeBase readKnowledgeBase() throws Exception {
>   KnowledgeBuilder kbuilder =  
> KnowledgeBuilderFactory.newKnowledgeBuilder();
>   //kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),  
> ResourceType.DRL);
>   kbuilder.add(ResourceFactory.newUrlResource(" http://127.0.0.1:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/org.sample/LATEST 
> "), ResourceType.PKG);
>   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;
>  }
> }
> the print info is:
> fired1:discount,550
> fired0:discount,530
> fired1:discount,480
> fired0:discount,460
> updated:discount,460
> ---------------------------------------------------------------------
> my java model is :
>
> package org.sample;
> import java.util.Date;
> public class Sales {
>  private String name;
>  private long sales;
>  private Date dateOfSale;
>  private boolean chocolateOnlyCustomer;
>  public String getName() {
>   return name;
>  }
>  public void setName(String name) {
>   this.name = name;
>  }
>  public long getSales() {
>   return sales;
>  }
>  public void setSales(long sales) {
>   this.sales = sales;
>  }
>  public Date getDateOfSale() {
>   return dateOfSale;
>  }
>  public void setDateOfSale(Date dateOfSale) {
>   this.dateOfSale = dateOfSale;
>  }
>  public boolean isChocolateOnlyCustomer() {
>   return chocolateOnlyCustomer;
>  }
>  public void setChocolateOnlyCustomer(boolean choclateOnlyCustomer) {
>   this.chocolateOnlyCustomer = chocolateOnlyCustomer;
>  }
> }
>
> rules:
> dialect "mvel"
> no-loop true
> rule "DiscountRule"
>    salience 9
> when
>       $fact0:Sales(s:sales>100)
> then
>       #Sales fact0=new Sales();
>       #fact0.setSales(s.getSales()-10);
>       #fact0.setName("discount");
>       #insert(fact0);
>
>       modify($fact0){setName("discount")}
>       modify($fact0){setSales(s-20)}
>       System.out.println("fired0:"+$fact0.getName()+
>                                 ","+$fact0.getSales());
> end
> rule "DiscountRule2"
>    salience 18
> when
>       $fact1:Sales(s1:sales>500)
> then
>       modify($fact1){setName("discount")}
>       modify($fact1){setSales(s1-50)}
>       System.out.println("fired1:"+$fact1.getName()+
>                                 ","+$fact1.getSales());
> end
>
>
>
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