Drools Rule Matching Behavior - Evaluation of Multiple Objects in a Collection

I am working with a Drools rule in which I have the following pattern matching conditions:

when
$contract: ContractFact()
$entity: EntityFact
$service: ServiceFact(serviceId == $contract.serviceId) from $contract.services
$ec: EvaluationCriteriaFact(
    toCode contains $entity.toCodes,
    fromCode contains $entity.fromCodes,
) from $service.evaluationCriterias

$pricing: Pricing(($entity.Weight >= minWeight && $entity.Weight <= maxWeight)) from 
$ec.pricingscenarios
$priceResult: PricingResultObject()
then
$priceResult.price = $calculatePrice.getTowPriceG($entity.toCodes, ...)
end

My concern is regarding the behavior when one of the EvaluationCriteriaFact instances matches the conditions but fails to match the Pricing conditions ($entity.Weight >= minWeight && $entity.Weight <= maxWeight). In this case, does the Drools engine proceed to check the remaining objects present in the evaluationCriterias list, or does it stop evaluating further?

Solution

The rule will fire once for each object in the list that matches your criteria. Each element in the list will be considered individually.

Here's a simpler example.

rule "example"
when
  Event( $attendees: attendees ) 
  Person( isVegetarian == true, $name: name ) from $attendees
then
  System.out.Println($name + " is attending and requires a vegetarian meal.")
end

If we pass the following object:

{
  attendees: [
    { name: "Alice", isVegetarian: true },
    { name: "Bob", isVegetarian: false },
    { name: "Charlie", isVegetarian: true },
    { name: "Denise" isVegetarian: false }
  ]
}

Then the output would be (in some order):

Alice is attending and requires a vegetarian meal.
Charlie is attending and requires a vegetarian meal.

If you invoked the rules using fireAllRules, that method would return 2 because the same rule matched and executed twice, once for the 'Alice' person, and once for the 'Charlie' person.