public function setSubscriber($subscriber)
    {
        $this->_subscriber = $subscriber;

        if ($subscriber->persisted()) {
            $this->actorId = $this->_subscriber->id;
        } else {
            $this->set('actorId', PHP_INT_MAX);
        }

        $this->getRepository()->getSpace()->setSaveOrder($this, $this->_subscriber);

        return $this;
    }