public InetSocketAddress next(long spinDelay) { currentIndex = ++currentIndex % serverAddresses.size(); if (currentIndex == lastIndex && spinDelay > 0) { try { Thread.sleep(spinDelay); } catch (InterruptedException e) { LOG.warn("Unexpected exception", e); } } else if (lastIndex == -1) { // We don't want to sleep on the first ever connect attempt. lastIndex = 0; } InetSocketAddress curAddr = serverAddresses.get(currentIndex); try { String curHostString = getHostString(curAddr); List<InetAddress> resolvedAddresses = new ArrayList<InetAddress>(Arrays.asList(this.resolver.getAllByName(curHostString))); if (resolvedAddresses.isEmpty()) { return curAddr; } Collections.shuffle(resolvedAddresses); return new InetSocketAddress(resolvedAddresses.get(0), curAddr.getPort()); } catch (UnknownHostException e) { return curAddr; } }