Re: [drools-user] Data Sharing in rules attached fiel

[Mark Proctor]

Amit,

This isn't a Drools problem its java, please see the FAQ and immutable 
objects.

Integer a = new Integer(1);
Integer b = a;
a == b (true)
Integer a = new Integer(1);
a == n (false)

Mark


Amit Jain wrote:
Opps the file has not attached. 

<?xml version="1.0"?>

<rule-set name="GetRanking"
          xmlns="http://drools.org/rules";
          xmlns:java="http://drools.org/semantics/java";
          xmlns:xs="http://www.w3.org/2001/XMLSchema-instance";
          xs:schemaLocation="http://drools.org/rules rules.xsd
                             http://drools.org/semantics/java java.xsd">

 <application-data identifier="count">
   java.lang.Integer
 </application-data>


<rule name="Rule 1" salience="100">
<parameter identifier="str">
  <class>java.lang.String</class>
</parameter>
<java:condition>true</java:condition>
  <java:consequence>
 if(count == null){
  count = new Integer(0);
 }
  System.out.println(count.intValue());
  </java:consequence>
</rule>

<rule name="Rule 2" salience="90">
  
<parameter identifier="str">
  <class>java.lang.String</class>
</parameter>
  <java:condition>true</java:condition>
  <java:consequence>
 if(count != null){
  System.out.println(count.intValue());
 }
  System.out.println(count);
  </java:consequence>
</rule>
</rule-set>
  ----- Original Message ----- 
  From: Amit Jain 
  To: user@drools.codehaus.org 
  Sent: Wednesday, November 16, 2005 2:39 PM
  Subject: Re: [drools-user] Data Sharing in rules


  Thanks for ur reply Mark but I am not getting the expected result. I have 
attached a demo rule file to test application data.
  Please have a look at the attached demo rule file where I have used 
application data. I changed the value of count(global variable)  to Integer(0) 
in Rule 1 and I am getting null in Rule 2.

  here is the outcome when the rules are fired.
  0
  null

  Please see where am I making mistake. 

  With Regards

  Amit





  ----- Original Message ----- 
  From: "Mark Proctor" <[EMAIL PROTECTED]>
  To: <user@drools.codehaus.org>
  Sent: Wednesday, November 16, 2005 1:13 PM
  Subject: Re: [drools-user] Data Sharing in rules


  > application data is global - you might be having problems with immutable 
  > objects.
  > Amit Jain wrote:
  > > HI!
  > >
  > > I need a variable which i want to use in all my rules. If i change the 
value
  > > of this variable it should be vissible in other rules as well. Is it
  > > possible to do something like that in rule file. I tried to use 
application
  > > data but the value its changed in one rule is nto vissible in other.
  > >
  > > With Regards
  > > Amit
  > >
  > >
  > >
  > >
  > >   
  >