http://metrics.dropwizard.io/metrics-jvm: A set of classes which allow you to monitor critical aspects of your Java Virtual Machine using Metrics.
  • Coda Hale
  • Ryan Tenney
  • Artem Prigoda 
package com.codahale.metrics.jvm;

import com.codahale.metrics.Gauge;
import com.codahale.metrics.Metric;
import com.codahale.metrics.MetricSet;

import java.lang.management.ClassLoadingMXBean;
import java.lang.management.ManagementFactory;
import java.util.HashMap;
import java.util.Map;


A set of gauges for JVM classloader usage.

/**
 * A set of gauges for JVM classloader usage.
 */
public class ClassLoadingGaugeSet implements MetricSet {

    private final ClassLoadingMXBean mxBean;

    public ClassLoadingGaugeSet() {
        this(ManagementFactory.getClassLoadingMXBean());
    }

    public ClassLoadingGaugeSet(ClassLoadingMXBean mxBean) {
        this.mxBean = mxBean;
    }

    @Override
    public Map<String, Metric> getMetrics() {
        final Map<String, Metric> gauges = new HashMap<>();
        gauges.put("loaded", (Gauge<Long>) mxBean::getTotalLoadedClassCount);
        gauges.put("unloaded", (Gauge<Long>) mxBean::getUnloadedClassCount);

        return gauges;
    }
}