apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/component/AdminServiceAddressLocator.java/AdminServiceAddressLocator/init
class AdminServiceAddressLocator:  @PostConstruct
  public void init() {
    allEnvs = portalSettings.getAllEnvs();

    //init restTemplate
    restTemplate = restTemplateFactory.getObject();

    refreshServiceAddressService =
        Executors.newScheduledThreadPool(1, ApolloThreadFactory.create("ServiceLocator", true));

    refreshServiceAddressService.schedule(new RefreshAdminServerAddressTask(), 1, TimeUnit.MILLISECONDS);
  }