public function loadGroup($groupId)
{
$cache = $this->cache->getItem('objectstategroup', $groupId);
$group = $cache->get();
if ($cache->isMiss()) {
$this->logger->logCall(__METHOD__, array('groupId' => $groupId));
$cache->set($group = $this->persistenceHandler->objectStateHandler()->loadGroup($groupId))->save();
}
return $group;
}