On 6/18/07, Smitha Bhat <bhat_smitha@yahoo.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");

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 < krishiyer@gmail.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_smitha@yahoo.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,

Smitha

Krishnan < krishiyer@gmail.com > wrote:

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 < bhat_smitha@yahoo.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,
     id,
     symbolCode,
     lonDouble,
     latDouble,
     elevDouble,
     reportDate,
     this);
    workingMemory.assertObject ( posIn );
    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

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Never assume the obvious is true.
- William Safire _______________________________________________
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