abstract sclass DynTable extends DynModule {
  transient JTable table;

  JTable visualize() {
    ret table = dataToTable_uneditable(sexyTable(), calc());
  }
  void unvisualize2() { table = null; }
  
  void update() {
    lock lock;
    if (table != null) dataToTable_uneditable(table, calc());
  }

  // should cache results if they are expensive to make
  abstract L<Map> calc();
}