List Info

Thread: Re: DRL authoring help
Re: DRL authoring help
country flaguser name
United States		 2007-06-18 11:01:17 

  


  

    
Hi Krishnan,
  
I need the class itself to be global as I might have to access other functions of it as I go along in the effort. 
  
I cannot seem to be able to call the methods of this global class. I have also added a snippet of the code.
  
 
  
Thanks
  
 Smitha
  
Here is my drl
  
 
  
 
  
drl=
  
package test.tools.rulesengine
  
import test.tools.rulesengine.Utilities;
  
global test.tools.rulesengine.Utilities util;
  
rule "Rule1"
  
when
  
$Position1 : PosReport()
  
eval($Position1.getName() == "POS_0_1")
  
then
  
  
util.setColor($Position1, "red");
  
end
  
 
  
 
  
 
  
try {
     builder.addPackageFromDrl(new StringReader( drl)
 );
     ;
    
      if(firstCall){
   ;     ruleBase = RuleBaseFactory.newRuleBase();
    ;    ruleBase.addPackage( builder.getPackage() );
     ;   workingMemory = ruleBase.newWorkingMemory();
        Utilities util = new Utilities();
        workingMemory.setGlobal("util", util);
  
             
        firstCall = false;
      }else
           ruleBase.addPackage( builder.getPackage() );
     ;//workingMemory = ruleBase.newWorkingMemory();
    } catch (DroolsParserException e1)
 {
     // TODO Auto-generated catch block
     e1.printStackTrace();
    } catch (IOException e1) {
     // TODO Auto-generated catch block
     e1.printStackTrace();
    } catch (Exception e1) {
     // TODO Auto-generated catch block
     e1.printStackTrace();
    }
  


Krishnan <krishiyergmail.com&gt; wrote:
  

Hi Smitha, 

They way I understand, in the then clause you would like to call a static function from some class. So, then you can add that to the import and access it directly. It does not have to be global. However, if for some reason you do need to add it as a global,, let me know.
 

send that when part of the rule again. 

-Krishnan. 

  
On 6/18/07, Smitha Bhat < bhat_smithayahoo.com">bhat_smithayahoo.com > wrote:  
  
Hi Krishnan,
  
I need the functionality of being able to call methods of a global class in the 'then' piece of the drl. I had defined the drl file as: 
  
 
  
package test.tools.rulesengine
  
import test.tools.rulesengine.Utilities;
  
global test.tools.rulesengine.Utilities util;
  
 
  
rule "Rule1"................. 
  
 
  
When I debug the 'when' piece, I see that the method to check the name is being called, but tfter that, the global util's class method is not called. Any pointers would be
 helpful.
  
 
  
Thanks,
    
  
Hi Smitha, 

Rewrite the rule as follows :- 

  
rule "Rule1"
  
when
  
$Position1 : Position ( name matches "POS-RPT_0_1" ) 
then 
  
$Position.setColor("red");
  
end

Note : You had something called util, unless it is a global, it will not work. 

-Krishnan. 

 
 
On 6/18/07, Smitha Bhat <yahoo.com" target=_blank> bhat_smithayahoo.com> wrote:   
  
Hi,
  
I am new to JBoss rules. I have a .drl as given below: 
  
 
  
rule "Rule1"
  
when 
  
$Position1 : Position()
  
eval($Position1.getName() contains "POS-RPT_0_1")
  
then
  
  
util.setColor($Position1, "red");
  
end
  
 
  
Before firing the rules, I assert my object as 
  
 
  
posIn = new Position(name,
   ; &nbsp;id,
 ; &nbsp; &nbsp;symbolCode,
 &nbsp;   ;lonDouble,
 &nbsp; &nbsp; latDouble,
&nbsp; &nbsp;  elevDouble,
&nbsp; &nbsp; &nbsp;reportDate,
   ; &nbsp;this);
&nbsp; &nbsp; workingMemory.assertObject ( posIn );
 &nbsp;  workingMemory.fireAllRules(); 
  
 
  
I get the following error.
  
 
 
 
org.drools.rule.InvalidRulePackage: Rule Compilation error The left-hand side of an assignment must be a variable Syntax error on token "contains", invalid AssignmentOperator 
  
at org.drools.rule.Package.checkValidity(Unknown Source)
  
at org.drools.common.AbstractRuleBase.addPackage(Unknown Source)
  
 
  
What is wrong with my drl? I have a Utilities class that I have defined as global. 
  
 
  
Thanks
  
 
  
  
  Looking for a deal? Find great prices on flights and hotels with Yahoo! FareChase.   

_______________________________________________
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-- 
Sivaramakrishna Iyer Krishnan (Anand) 

Never assume the obvious is true. 
- William Safire _______________________________________________ 
rules-users mailing list
lists.jboss.org" target=_blank>rules-userslists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users

  
  
  Need a vacation? Get
 great deals to amazing places on Yahoo! Travel.   

_______________________________________________
rules-users mailing list
lists.jboss.org">rules-userslists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users 




-- 
Sivaramakrishna Iyer Krishnan (Anand) 

Never assume the obvious is true. 
- William Safire _______________________________________________
rules-users mailing list
rules-userslists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users

 ;
      
Get the Yahoo! toolbar and be alerted to new email wherever you're surfing. 

  

  
  
   
     
    

  

    Re:  DRL authoring help
  


  

     user name

     2007-06-18 11:34:45
  


  

    

  


  

    hi smitha, 

how do you know that setColor() is not getting called ?. Is it because you have a break point inside this method. 
Let me try this experiment and get back to you about whether it is working for me or not. Also, which version of 

drools are you using ?

-Krishnan. 

On 6/18/07, Smitha Bhat < bhat_smithayahoo.com">bhat_smithayahoo.com> wrote:

Hi Krishnan,
  
I need the class itself to be global as I might have to access other functions of it as I go along in the effort. 

  
I cannot seem to be able to call the methods of this global class. I have also added a snippet of the code.
  
 
  
Thanks
  
 Smitha
  
Here is my drl
  
 
  

 
  
drl=
  
package test.tools.rulesengine
  
import test.tools.rulesengine.Utilities;
  
global test.tools.rulesengine.Utilities util;
  

rule "Rule1"
  
when
  
$Position1 : PosReport()
  
eval($Position1.getName() == "POS_0_1")


  
then
  
  
util.setColor($Position1, "red&quot;);

  
end
  
 
  
   
 
  
try {
 &nbsp; &nbsp; builder.addPackageFromDrl
(new StringReader( drl)
 );
 &nbsp;   ;
 &nbsp;  
 &nbsp; &nbsp;  if(firstCall){
   ; &nbsp;   ruleBase = RuleBaseFactory.newRuleBase();
&nbsp;   ; &nbsp;  ruleBase.addPackage( builder.getPackage() );
 &nbsp;   ;   workingMemory = ruleBase.newWorkingMemory();
&nbsp; &nbsp; &nbsp;   Utilities util = new Utilities();

   ; &nbsp;   workingMemory.setGlobal(&quot;util&quot;, util);
  
 &nbsp; &nbsp; &nbsp;  &nbsp; &nbsp;  
 &nbsp; &nbsp; &nbsp;  firstCall = false;
&nbsp; &nbsp;  &nbsp;}else
&nbsp; &nbsp; &nbsp;    &nbsp; ruleBase.addPackage( builder.getPackage() );
 &nbsp;   ;//workingMemory = ruleBase.newWorkingMemory
();
&nbsp;   ;} catch (DroolsParserException e1)
 {
 &nbsp; &nbsp; // TODO Auto-generated catch block
&nbsp; &nbsp; &nbsp;e1.printStackTrace();
 &nbsp;  } catch (IOException e1) {
 &nbsp; &nbsp; // TODO Auto-generated catch block
&nbsp; &nbsp; &nbsp;e1.printStackTrace();
 &nbsp;  } catch (Exception e1) {
 &nbsp; &nbsp; // TODO Auto-generated catch block

&nbsp; &nbsp;  e1.printStackTrace();
 ; &nbsp; }
  


Krishnan < krishiyergmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
krishiyergmail.com> wrote:
  

Hi Smitha, 


They way I understand, in the then clause you would like to call a static function from some class. So, then you can add that to the import and access it directly. It does not have to be global. However, if for some reason you do need to add it as a global,, let me know.
 

send that when part of the rule again. 

-Krishnan. 

  
On 6/18/07, Smitha Bhat < bhat_smithayahoo.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
bhat_smithayahoo.com > wrote:  
  
Hi Krishnan,
  
I need the functionality of being able to call methods of a global class in the 'then&#39; piece of the drl. I had defined the drl file as: 

  
 
  
package test.tools.rulesengine
  
import test.tools.rulesengine.Utilities;
  
global test.tools.rulesengine.Utilities util;
  
 
  
rule "Rule1"................. 

  
 
  
When I debug the 'when&#39; piece, I see that the method to check the name is being called, but tfter that, the global util's class method is not called. Any pointers would be
 helpful.
  
 
  
Thanks,
  
Smitha  


Krishnan < krishiyergmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)"> krishiyergmail.com

> wrote:
  
  
Hi Smitha, 

Rewrite the rule as follows :- 

  

rule "Rule1"
  
when
  
$Position1 : Position ( name matches "POS-RPT_0_1&quot; ) 
then 


  
$Position.setColor(&quot;red&quot;);
  
end

Note : You had something called util, unless it is a global, it will not work. 


-Krishnan. 

 
 
On 6/18/07, Smitha Bhat < bhat_smithayahoo.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)"> bhat_smithayahoo.com

> wrote:   
  
Hi,
  
I am new to JBoss rules. I have a .drl as given below: 

  
 
  
rule "Rule1"
  
when 
  
$Position1 : Position()

  
eval($Position1.getName() contains "POS-RPT_0_1&quot;)
  
then
  

  
util.setColor($Position1, "red&quot;);
  
end
  
 

  
Before firing the rules, I assert my object as 
  
 
  
posIn = new Position(name,

&nbsp; &nbsp; &nbsp;id,
&nbsp; &nbsp; &nbsp;symbolCode,
 ; &nbsp; &nbsp;lonDouble,
 &nbsp; &nbsp; latDouble,
  ; &nbsp; elevDouble,
&nbsp; &nbsp;  reportDate,
&nbsp; &nbsp; &nbsp;this);
  ; &nbsp;workingMemory.assertObject ( posIn );
 &nbsp;  workingMemory.fireAllRules(); 

  
 
  
I get the following error.
  
 

 
 
org.drools.rule.InvalidRulePackage: Rule Compilation error The left-hand side of an assignment must be a variable Syntax error on token "contains", invalid AssignmentOperator 

  
at org.drools.rule.Package.checkValidity(Unknown Source)

  
at org.drools.common.AbstractRuleBase.addPackage(Unknown Source)
  

 
  
What is wrong with my drl? I have a Utilities class that I have defined as global. 

  
 
  

Thanks
  
 
  
  
  Looking for a deal? 
Find great prices on flights and hotels with Yahoo! FareChase.   

_______________________________________________
rules-users mailing list
 rules-userslists.jboss.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
rules-userslists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users 





-- 
Sivaramakrishna Iyer Krishnan (Anand) 

Never assume the obvious is true. 
- William Safire _______________________________________________ 

rules-users mailing list
 rules-userslists.jboss.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">rules-userslists.jboss.org

https://lists.jboss.org/mailman/listinfo/rules-users

  
  
  Need a vacation? 
Get
 great deals to amazing places on Yahoo! Travel.   

_______________________________________________
rules-users mailing list
 rules-userslists.jboss.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
rules-userslists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users 





-- 
Sivaramakrishna Iyer Krishnan (Anand) 

Never assume the obvious is true. 
- William Safire _______________________________________________

rules-users mailing list
 rules-userslists.jboss.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">rules-userslists.jboss.org

https://lists.jboss.org/mailman/listinfo/rules-users

 
      
Get the Yahoo! toolbar and 
be alerted to new email wherever you're surfing. 

_______________________________________________
rules-users mailing list
lists.jboss.org">
rules-userslists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users





-- 
Sivaramakrishna Iyer Krishnan (Anand) 

Never assume the obvious is true. 
- William Safire


  

  
  
   
     
    

  

    Re:  DRL authoring help
  


  

     country flaguser name
United Kingdom		
     2007-06-18 11:29:34
  


  

    

  


  

    
class instances are globals, classes themselves aren't.



Mark

Smitha Bhat wrote:

web60316.mail.yahoo.com"
 type="cite">
  
Hi Krishnan,

  
I need the class itself to be global as I might have to access
other functions of it as I go along in the effort. 

  
I cannot seem to be able to call the methods of this global
class. I have also added a snippet of the code.

  
 

  
Thanks

  
 Smitha

  
Here is my drl

  
 

  
 

  
drl=

   
  
package test.tools.rulesengine

   
  
import test.tools.rulesengine.Utilities;

   
  
global test.tools.rulesengine.Utilities util;

   
  
rule "Rule1"


   
  
when

   
  
$Position1 : PosReport()

   
  
eval($Position1.getName() == "POS_0_1")

   
  
then

    
  
util.setColor($Position1, "red");


   
  
end

   
  
 

   
  
 

  
 

  
try {

   ; &nbsp;builder.addPackageFromDrl(new StringReader( drl) );

 ; &nbsp; &nbsp;

 ; &nbsp; 

 &nbsp;   ; if(firstCall){

&nbsp; &nbsp; &nbsp;   ruleBase = RuleBaseFactory.newRuleBase();


 &nbsp; &nbsp; &nbsp;  ruleBase.addPackage( builder.getPackage() );

 ; &nbsp; &nbsp;   workingMemory = ruleBase.newWorkingMemory();

&nbsp;   ; &nbsp;  Utilities util = new Utilities();

   ; &nbsp;   workingMemory.setGlobal("util", util);

  
 &nbsp; &nbsp; &nbsp;  &nbsp; &nbsp;  

 &nbsp;   ;   firstCall = false;

&nbsp;    &nbsp;}else

&nbsp;   ; &nbsp;   &nbsp; ruleBase.addPackage( builder.getPackage() );

 ; &nbsp; &nbsp;//workingMemory = ruleBase.newWorkingMemory();

&nbsp;   ;} catch (DroolsParserException e1) {

   ; &nbsp;// TODO Auto-generated catch block

&nbsp; &nbsp;  e1.printStackTrace();

&nbsp; &nbsp; } catch (IOException e1) {

   ; &nbsp;// TODO Auto-generated catch block

&nbsp; &nbsp;  e1.printStackTrace();

&nbsp; &nbsp; } catch (Exception e1) {

   ; &nbsp;// TODO Auto-generated catch block

&nbsp; &nbsp;  e1.printStackTrace();

&nbsp; &nbsp; }

  
  


Hi Smitha, 

    

They way I understand, in the then clause you would like to call a
static function from some class. So, then you can add that to the
import and access it directly. It does not have to be global. However,
if for some reason you do need to add it as a global,, let me know. 

    

send that when part of the rule again. 

    

-Krishnan. 

    

    
On 6/18/07, Smitha Bhat <yahoo.com">bhat_smithayahoo.com >
wrote:
    

      
Hi Krishnan,

      
I need the functionality of being able to call methods of a
global class in the 'then' piece of the drl. I had defined the drl file
as: 

      
 

      
package test.tools.rulesengine

      
import test.tools.rulesengine.Utilities;

      
global test.tools.rulesengine.Utilities util;

      
 

      
rule "Rule1"................. 

      
 

      
When I debug the 'when' piece, I see that the method to
check the name is being called, but tfter that, the global util's class
method is not called. Any pointers would be helpful.


      
 

      
Thanks,


      
      

        
Hi Smitha, 

        

Rewrite the rule as follows :- 

        

        
rule "Rule1"


        
when

        
$Position1 : Position ( name matches
"POS-RPT_0_1" ) 

then 

        

        
$Position.setColor("red");

        
        
end

        

Note : You had something called util, unless it is a global, it will
not work. 

        

        

-Krishnan. 

        

        
On 6/18/07, Smitha Bhat <yahoo.com" target="_blank">
bhat_smithayahoo.com> wrote:
        

          
Hi,

          
I am new to JBoss rules. I have a .drl as given below: 

          
 

          
rule "Rule1"


          
when 

          
$Position1 : Position()

          
eval($Position1.getName() contains
"POS-RPT_0_1")

          
then

          
util.setColor($Position1, "red");


          
end

          
 

          
Before firing the rules, I assert my
object as 

          
 

          
posIn = new Position(name,

&nbsp; &nbsp; &nbsp;id,

&nbsp;   ; symbolCode,

&nbsp;   ; lonDouble,

&nbsp; &nbsp;  latDouble,

&nbsp; &nbsp; &nbsp;elevDouble,

&nbsp; &nbsp; &nbsp;reportDate,

&nbsp; &nbsp; &nbsp;this);

 &nbsp; &nbsp;workingMemory.assertObject ( posIn );

 ; &nbsp; workingMemory.fireAllRules(); 

          
 

          
I get the following error.

          
 

          
          
org.drools.rule.InvalidRulePackage: Rule Compilation
error The left-hand side of an assignment must be a variable Syntax
error on token "contains", invalid AssignmentOperator 

          
          
at
org.drools.rule.Package.checkValidity(Unknown Source)

          
at
org.drools.common.AbstractRuleBase.addPackage(Unknown Source)

          
 

          
What is
wrong with my drl? I have a Utilities class that I have defined as
global. 

          
 

          
Thanks


          
          
 

          
          
 Looking for a deal? Find great prices on flights and hotels with
Yahoo! FareChase. 

_______________________________________________

rules-users mailing list

          lists.jboss.org" target="_blank">rules-userslists.jboss.org

          https://lists.jboss.org/mailman/listinfo/rules-users 

          

        

        

        

        

        

-- 

Sivaramakrishna Iyer Krishnan (Anand) 

        

Never assume the obvious is true. 

        

- William Safire _______________________________________________ 

rules-users mailing list

        lists.jboss.org" target="_blank">rules-userslists.jboss.org

        https://lists.jboss.org/mailman/listinfo/rules-users

        

      

      
 Need a vacation? Get great deals to amazing places on Yahoo!
Travel. 

_______________________________________________

rules-users mailing list

      lists.jboss.org">rules-userslists.jboss.org

      https://lists.jboss.org/mailman/listinfo/rules-users 

      

    

    

    

    

    

-- 

Sivaramakrishna Iyer Krishnan (Anand) 

    

Never assume the obvious is true. 

- William Safire _______________________________________________

rules-users mailing list

lists.jboss.org">rules-userslists.jboss.org

https://lists.jboss.org/mailman/listinfo/rules-users

  

  

  
 

  
Get the Yahoo! toolbar and be
alerted to new email wherever you're surfing.
  

_______________________________________________
rules-users mailing list
lists.jboss.org">rules-userslists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users

  






  

  
  
   
     
    






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