public int prepare(Xid xid) throws XAException {

    // flush data on disk here

    System.out.println("XAResourceManager.prepare(Xid=" + xid + "), th_id=" + th_id);

    try {

      log.flush();

      log.close();

    } catch (IOException e) {

      throw new XAException("Unable to flush data to the log file <" +

          log.getFilename() + ">.");

    }

    return XAResource.XA_OK;

  }

thanks for the cool library