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 interface allows a pluggable implementation of what file names the CsvReporter will write to. 
/**
 * This interface allows a pluggable implementation of what file names
 * the {@link CsvReporter} will write to.
 */
public interface CsvFileProvider {

    File getFile(File directory, String metricName);
}