http://metrics.dropwizard.io/metrics-core: Metrics is a Java library which gives you unparalleled insight into what your code does in production. Metrics provides a powerful toolkit of ways to measure the behavior of critical components in your production environment.
  • Coda Hale
  • Ryan Tenney
  • Artem Prigoda 
package com.codahale.metrics;

import java.io.File;


This implementation of the CsvFileProvider will always return the same name for the same metric. This means the CSV file will grow indefinitely. 
/**
 * This implementation of the {@link CsvFileProvider} will always return the same name
 * for the same metric. This means the CSV file will grow indefinitely.
 */
public class FixedNameCsvFileProvider implements CsvFileProvider {

    @Override
    public File getFile(File directory, String metricName) {
        return new File(directory, sanitize(metricName) + ".csv");
    }

    protected String sanitize(String metricName) {
        //Forward slash character is definitely illegal in both Windows and Linux
        //https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx
        return metricName.replaceFirst("^/", "").replaceAll("/", ".");
    }
}