[rules-users] Help with LHS part of the Rule

[new2drools]

I am using Drools 5.

In the LHS part of a rule, is it possible to call a method, in a class
instance (that has been inserted into the working memory) which expects two
parameters, and returns a boolean?

For example, how can I invoke the following method in LHS (in a DRL file)
part of the rule?

public class BusinessService {

   public boolean isValidSomething(String param1, String param2) {
      return true;
   }

}

The only way I could do this was:

$bService : BusinessService()

$retValue : Boolean() from $bService.isValidSomething("param1", "param2")

The problem I am running into is, by using the above syntax, I am forced to
use 'eval', when I have to use some conditional logic. My understanding is
that using 'eval' will result in sub-optimal performance.

Another question I have is related to conditional logic in the rule
language. When I capture the return values (as shown above) in variables, I
am not able to use the following syntax...

$date1 : Date() from Object1.getBeginDate()

$date2 : Date() from Object2.getCancelDate()

(Object1 and Object2 are different object's)

(($retValue == Boolean.FALSE) && ($date1 > $date2))

I have to do the following:

eval (($retValue == Bollean.FALSE) && ($date1.getTime() > $date2.getTime()))

I am not sure if I am using the rule language correctly. So, please bear
with me, if I making some obvious mistakes.

Any help, would be highly appreciated.

Thanks!


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