@Override
  public void compose(IComposer msg) {
    msg.writeInt(roomId);
    msg.writeInt(playersWithRights.size());

    for (Integer id : playersWithRights) {
      msg.writeInt(id);

      String username = PlayerDao.getUsernameByPlayerId(id);
      msg.writeString(username != null ? username : "******");
    }
  }