cartChanged example

// filter rules which matches to current scope                 $rules = $rules->filterMatchingRules($cart, $context);

                // update matching rules in context                 $context->setRuleIds($rules->getIds());

                // calculate cart again                 $cart = $this->processor->process($cart, $context, $behaviorContext);

                // check if the cart changed, in this case we have to recalculate the cart again                 $recalculate = $this->cartChanged($cart, $compare);

                // check if rules changed for the last calculated cart, in this case we have to recalculate                 $ruleCompare = $all->filterMatchingRules($cart, $context);

                if (!$rules->equals($ruleCompare)) {
                    $recalculate = true;
                    $rules = $ruleCompare;
                }

                ++$iteration;
            } while ($recalculate);