public function moveListOfArtifactsBefore(array $list_of_artifact_ids, $successor_id, $context_id, $project_id)
 {
     $ranks_before_move = $this->getGlobalRanks($list_of_artifact_ids);
     $this->priority_dao->moveListOfArtifactsBefore($list_of_artifact_ids, $successor_id);
     $this->logPriorityChangesWhenMovingListOfArtifactsBefore($list_of_artifact_ids, $ranks_before_move, $successor_id, $context_id, $project_id);
 }