/**
  * {@inheritdoc}
  */
 public function onSuccess()
 {
     $cookie = new AnnouncementCookie();
     $repo = new AnnouncementIniRepository();
     $query = $repo->findActive();
     $filter = array();
     foreach ($cookie->getAcknowledged() as $hash) {
         $filter[] = Filter::expression('hash', '=', $hash);
     }
     $query->addFilter(Filter::matchAny($filter));
     $acknowledged = array();
     foreach ($query as $row) {
         $acknowledged[] = $row->hash;
     }
     $acknowledged[] = $this->getElement('hash')->getValue();
     $cookie->setAcknowledged($acknowledged);
     $this->getResponse()->setCookie($cookie);
     return true;
 }