private void randomDomainNamePos() {
   Random rand = new Random();
   List<String> domainList = this.diamondConfigure.getDomainNameList();
   if (!domainList.isEmpty()) {
     this.domainNamePos.set(rand.nextInt(domainList.size()));
   }
 }
  /**
   * Sends an IQ packet to the Clearspace external component and returns the IQ packet returned by
   * CS or <tt>null</tt> if no answer was received before the specified timeout.
   *
   * @param packet IQ packet to send.
   * @param timeout milliseconds to wait before timing out.
   * @return IQ packet returned by Clearspace responsing the packet we sent.
   */
  public IQ query(final IQ packet, int timeout) {
    // Complain if FROM is empty
    if (packet.getFrom() == null) {
      throw new IllegalStateException("IQ packets with no FROM cannot be sent to Clearspace");
    }
    // If CS is not connected then return null
    if (clearspaces.isEmpty()) {
      return null;
    }
    // Set the target address to the IQ packet. Roate list so we distribute load
    String component;
    synchronized (clearspaces) {
      component = clearspaces.get(0);
      Collections.rotate(clearspaces, 1);
    }
    packet.setTo(component);
    final LinkedBlockingQueue<IQ> answer = new LinkedBlockingQueue<IQ>(8);
    final IQRouter router = XMPPServer.getInstance().getIQRouter();
    router.addIQResultListener(
        packet.getID(),
        new IQResultListener() {
          public void receivedAnswer(IQ packet) {
            answer.offer(packet);
          }

          public void answerTimeout(String packetId) {
            Log.warn("No answer from Clearspace was received for IQ stanza: " + packet);
          }
        });
    XMPPServer.getInstance().getIQRouter().route(packet);
    IQ reply = null;
    try {
      reply = answer.poll(timeout, TimeUnit.MILLISECONDS);
    } catch (InterruptedException e) {
      // Ignore
    }
    return reply;
  }