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);
}
public SingleConnectionManager(SingleServerConfig cfg, Config config) {
MasterSlaveServersConfig newconfig = new MasterSlaveServersConfig();
String addr = cfg.getAddress().getHost() + ":" + cfg.getAddress().getPort();
newconfig.setRetryAttempts(cfg.getRetryAttempts());
newconfig.setRetryInterval(cfg.getRetryInterval());
newconfig.setTimeout(cfg.getTimeout());
newconfig.setPingTimeout(cfg.getPingTimeout());
newconfig.setPassword(cfg.getPassword());
newconfig.setDatabase(cfg.getDatabase());
newconfig.setClientName(cfg.getClientName());
newconfig.setMasterAddress(addr);
newconfig.setMasterConnectionPoolSize(cfg.getConnectionPoolSize());
newconfig.setSubscriptionsPerConnection(cfg.getSubscriptionsPerConnection());
newconfig.setSlaveSubscriptionConnectionPoolSize(cfg.getSubscriptionConnectionPoolSize());
init(newconfig, config);
if (cfg.isDnsMonitoring()) {
try {
this.currentMaster.set(InetAddress.getByName(cfg.getAddress().getHost()));
} catch (UnknownHostException e) {
throw new RedisConnectionException("Unknown host", e);
}
log.debug("DNS monitoring enabled; Current master set to {}", currentMaster.get());
monitorDnsChange(cfg);
}
}