[rules-users] DRL authoring help

[Krishnan]

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_smitha at 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 at 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 at 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 at 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 at 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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> >
> > --
> > Sivaramakrishna Iyer Krishnan (Anand)
> >
> > Never assume the obvious is true.
> > - William Safire _______________________________________________
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> --
> Sivaramakrishna Iyer Krishnan (Anand)
>
> Never assume the obvious is true.
> - William Safire _______________________________________________
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-- 
Sivaramakrishna Iyer Krishnan (Anand)

Never assume the obvious is true.
- William Safire
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