class BenchmarkProgressPrinter implements RouteMetricSet.ProgressCallback {

    @Override
    public void done(RouteMetricSet metrics) {
        try {
		    output.println("# Time used, num ok, num error, min latency, max latency, average latency");
            printMetrics(output, metrics);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public  BenchmarkProgressPrinter(Timer timer, PrintStream output);

}