Drools 5.0 - Locally... Global

Question

Hello,

I'd like to declare a global variable that is scoped to only my rules file. For example: variable $reUseMe is only declared once.

rule 1

$reUseMe : POJO(val = 1) //other conditions

rule 2

$reUseMe > val

Answer 1

I'll just insert it into the working memory. Was trying not to do this.

Answer 2

you can refer to globals in LHS via eval:

global SomeType variable

rule ... when ... eval(variable > something)

Answer 3

There are no scoped global variables, but in some cases rule inheritance helps.

rule "Rule 1"
  when
    $reUseMe :POJO( val == 1 )
  then
end

rule "Rule 2" extends "Rule 1"
  when
    # You can use the variables from Rule 1
    POJO( val > $reUseMe.val ) 
  then
end

Only LHS is added. RHS from Rule 1 is ignored in Rule 2.