public class LoggerFunction implements Function<String, Void> {
    @Override
    public Void process(String input, Context context) {
        Logger LOG = context.getLogger();
        if (input.length() <= 100) {
            LOG.info("This string has a length of {}", input);
        } else {
            LOG.warn("This string is getting too long! It has {} characters", input);
        }
    }
}