private function countUsers(MassMailQueue $entry)
{
if ($entry->getType() === MassMailQueue::TYPE_PREVIEW) {
return 1;
}
$query = $this->em->getConnection()->createQueryBuilder();
$query->select('COUNT(*)')->from('User', 'u');
$filter = Filter::fromArray($entry->getFilterSpec(), $this->em);
$this->applyQueryFilter($query, $filter);
return $query->execute()->fetchColumn();
}
