private <T> T get(String key, Function<String, T> transform, T defaultValue) {
        String value = registryParameters.get(key);
        if (value != null) {
            return transform.apply(value);
        }
        return defaultValue;
    }
the properties of polaris registry

@author <a href=mailto:bner666@gmail.com>ZhangLibin</a>
registry/registry-polaris/src/main/java/com/alipay/sofa/rpc/registry/polaris/PolarisRegistryProperties.java