/**
* 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;
}
