static String mkStreamIdNamePrefix(String jobId,String opletId){
  return String.format(ID_PREFIX + JOB_OPLET_FMT,jobId,opletId);
}

static String mkStreamIdNamePrefix ( String jobId , String opletId ) { return String . format ( ID_PREFIX + JOB_OPLET_FMT , jobId , opletId ) ; }
create a prefix of a streamid based name
