public function collect($force = false)
    {
        $active = $this->getPersistence()->get(self::class);
        if (!$active || $force) {
            $action = new GetActiveDeliveryExecution();
            $this->propagate($action);
            $active = $action->getNumberOfActiveActions();
            $this->getPersistence()->set(self::class, $active, $this->getOption(self::OPTION_TTL));
        }
        return $active;


    }