private void monitorDnsChange(final SingleServerConfig cfg) {
monitorFuture =
GlobalEventExecutor.INSTANCE.scheduleWithFixedDelay(
new Runnable() {
@Override
public void run() {
try {
InetAddress master = currentMaster.get();
InetAddress now = InetAddress.getByName(cfg.getAddress().getHost());
if (!now.getHostAddress().equals(master.getHostAddress())) {
log.info(
"Detected DNS change. {} has changed from {} to {}",
cfg.getAddress().getHost(),
master.getHostAddress(),
now.getHostAddress());
if (currentMaster.compareAndSet(master, now)) {
changeMaster(
MAX_SLOT, cfg.getAddress().getHost(), cfg.getAddress().getPort());
log.info("Master has been changed");
}
}
} catch (Exception e) {
log.error(e.getMessage(), e);
}
}
},
cfg.getDnsMonitoringInterval(),
cfg.getDnsMonitoringInterval(),
TimeUnit.MILLISECONDS);
}
