private static final class EurekaInstanceInfoUtil {

        private static final AttributeKey<InstanceInfo> INSTANCE_INFO = AttributeKey.valueOf(
                EurekaInstanceInfoUtil.class, "INSTANCE_INFO");

        @Nullable
        static InstanceInfo get(Endpoint endpoint) {
            requireNonNull(endpoint, "endpoint");
            return endpoint.attr(INSTANCE_INFO);
        }

        static Endpoint with(Endpoint endpoint, InstanceInfo instanceInfo) {
            requireNonNull(endpoint, "endpoint");
            requireNonNull(instanceInfo, "instanceInfo");
            return endpoint.withAttr(INSTANCE_INFO, instanceInfo);
        }
    }

    private static Endpoint endpoint(InstanceInfo instanceInfo, boolean secureVip) {
        final String hostname = instanceInfo.getHostName();
        final PortWrapper portWrapper = instanceInfo.getPort();
        final int port;
        if (secureVip || !portWrapper.isEnabled()) {
            port = instanceInfo.getSecurePort().getPort();
        } else {
            port = portWrapper.getPort();
        }

        assert hostname != null;
        Endpoint endpoint = Endpoint.of(hostname, port);
        final String ipAddr = instanceInfo.getIpAddr();
        if (ipAddr != null && hostname != ipAddr) {
            endpoint = endpoint.withIpAddr(ipAddr);
        }
        return EurekaInstanceInfoUtil.with(endpoint, instanceInfo);
    }