docs: @Override
      public void handleJoinResponse(JoinRsp join_rsp) {
          View v=join_rsp.getView();
          ViewId tmp_vid=v != null? v.getViewId() : null;
          ViewId my_view=gms.getViewId();
          if(tmp_vid != null && my_view != null && tmp_vid.compareToIDs(my_view) > 0) {
              Digest d=join_rsp.getDigest();
              gms.installView(v, d);
          }
      }