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drools

Drools 5.0 - Locally... Global

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

Solution

  • 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.