class ConfigObserver {

    public ConfigObserver onStringValue(String key, String defaultValue, ConfigValueListener<String> listener) {
        return onSingleConfigValue(key, Function.identity(), defaultValue, listener);
    }

    public  ConfigObserver(String applicationName);
    public  ConfigObserver(File configDirectory, String applicationName);
    public  ConfigObserver(File configDirectory, String applicationName, List<String> profiles);
    public  ConfigObserver(ConfigLoader configLoader);

}