protected function getCacheKeyForStoredVariable(array $row, $variable)
{
$table = $this->getTableName($row);
$field = $this->getFieldName($row);
$uid = TRUE === isset($row['uid']) ? $row['uid'] : uniqid();
return $table . $this->getListType() . $this->getContentObjectType() . md5(serialize($row[$field])) . $uid . $variable . get_class($this);
}