/**
  * Counts the number of items which still need to be processed
  *
  * @author Timo Schmidt <*****@*****.**>
  * @param void
  * @return int
  */
 public function countItemsToProcess()
 {
     $queueRepository = new tx_crawler_domain_queue_repository();
     return $queueRepository->countNonExecutedItemsByProcess($this);
 }