public static Commit<SetUser> local(SUser user) {
   SetUser res = new SetUser();
   res.user = user;
   return ConsensusUtil.localCommit(res);
 }
 public static Commit<DeleteUser> local(String userName) {
   DeleteUser res = new DeleteUser();
   res.userName = userName;
   return ConsensusUtil.localCommit(res);
 }