[rules-users] Beginner question about Dynamic Beans

[fmarchioni]

> that's strange. From my experience, only those rules that depend on
> the cash property should be fired if the new value triggers an
> activation that wouldn't have been triggered for the old value. Could
> you post the code of your PropertyChangeSupport implementation?
> 
Hi Marcus,
thanks for your reply, well my Bean implementation is:

public class Buyer {
   int age;
   double yearlyIncome;
   double cash;
   
   private final PropertyChangeSupport changes = new PropertyChangeSupport(
this );
   
   public void addPropertyChangeListener(final PropertyChangeListener l) {
	    this.changes.addPropertyChangeListener( l );
	}

	public void removePropertyChangeListener(final PropertyChangeListener l) {
	    this.changes.removePropertyChangeListener( l );
	}

public int getAge() {
	return age;
}
public void setAge(int newAge) {
	int oldAge = this.age;
	this.age = newAge;
	this.changes.firePropertyChange("age", oldAge, newAge);
}
public double getCash() {
	return cash;
}
public void setCash(double newCash) {
	double oldCash = this.cash;
	this.cash = newCash;
             System.out.println("[Buyer ] cash is " + this.cash);
	this.changes.firePropertyChange("cash", oldCash, newCash);
}
public double getYearlyIncome() {
	return yearlyIncome;
}
public void setYearlyIncome(double newYearlyIncome) {
	
	double oldYearlyIncome = this.yearlyIncome;
	this.yearlyIncome = newYearlyIncome;
	this.changes.firePropertyChange("yearlyIncome", oldYearlyIncome,
newYearlyIncome);
	
	 
}
   
}

And my complete Rule file is:

global drools.BankApplication bankApp;

rule "Check Age"
       
  when
     b : Buyer (age <18)
  then
      System.out.println("[Rule.drl] Checking age");
      bankApp.addMessage(Messages.AGE_UNDER_18);
      b.setCash(40000);
end

rule "Check Cash"
       
  when
     b : Buyer (cash <5000)
  then
      System.out.println("[Rule.drl] Checking cash");
      System.out.println("[Rule.drl] cash is " + b.getCash());
      bankApp.addMessage(Messages.CASH_LOW );
end

rule "Check Income"
       
  when
     b : Buyer (yearlyIncome <50000)
  then
      System.out.println("[Rule.drl] Checking income");
      bankApp.addMessage(Messages.INCOME_LOW );
end

And facts are passed to the Working memory this way:

            Buyer buyer = new Buyer();
            BankApplication bankApp = new BankApplication();
            
            buyer.setAge(15);
            buyer.setCash(1000);
            buyer.setYearlyIncome(30000);
            
            workingMemory.setGlobal("bankApp", bankApp);
            workingMemory.insert(buyer,true);
            
            workingMemory.fireAllRules(); 

Looking at the log file:

14:23:47,109 INFO  [STDOUT]      [Buyer ]  Setted cash with 1000.0
14:23:47,109 INFO  [STDOUT] [Rule.drl] Checking income
14:23:47,125 INFO  [STDOUT] [Rule.drl] Checking cash
14:23:47,125 INFO  [STDOUT]      [Rule.drl] cash is 1000.0
14:23:47,125 INFO  [STDOUT] [Rule.drl] Checking age
14:23:47,125 INFO  [STDOUT]      [Buyer ]  Setted cash with 40000.0
14:23:47,125 INFO  [STDOUT] [Rule.drl] Checking income
14:23:47,125 INFO  [STDOUT]      [Rule.drl] Checking age
14:23:47,125 INFO  [STDOUT]      [Buyer ]Setted cash with 40000.0

I can see that the Rule "income" has been invoked twice: why if it doesn't
use the cash attribute in it ?
Thanks a lot for your time
Francesco

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