code: protected function getLimitFor($actionName, $blockType, $entityId)
      {
          $limit = $this->storage->getLimitFor($actionName, $blockType, $entityId);
          if ($limit === null) {
              $limit = array("ts" => 0, "cnt" => 0);
          }
          return $limit;
      }
docs: Retrieves a limit array for a given action,type,id
  
  @param string $actionName Action id (e.g. "login")
  @param string $blockType Block type (e.g. "ip")
  @param string $entityId Entity identifier
  @return array Limit data array