code: def getServices(self):
          
          try:
              conn = self.dbi.connection()
              result = self.serviceslist.execute(conn)
              return result
          except Exception as ex:
              msg = (("%s DBSServicesRegistry/getServices." + 
                      " %s\n. Exception trace: \n %s") %
                     (DBSEXCEPTIONS['dbsException-3'], ex,
                      traceback.format_exc()))
              self.logger.exception(msg )
              raise Exception ("dbsException-3", msg )
          finally:
              conn.close()
docs: Simple method that returs list of all know DBS instances, instances known to this registry