/* * Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"). You may not * use this file except in compliance with the License. A copy of the License * is located at * * http://aws.amazon.com/apache2.0/ * * or in the "license" file accompanying this file. This file is distributed * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either * express or implied. See the License for the specific language governing * permissions and limitations under the License. */ package software.amazon.swage.metrics.jmx.sensor; import software.amazon.swage.metrics.Metric; import software.amazon.swage.metrics.MetricContext; import software.amazon.swage.metrics.Unit; import java.lang.management.ClassLoadingMXBean; import java.lang.management.ManagementFactory; /** * Records information about class loading in the JVM, as reported by the * ClassLoadingMXBean. */ public class ClassLoadingSensor implements Sensor { /** * The number of classes that are currently loaded in the JVM */ public static final Metric CURRENT_COUNT = Metric.define("LoadedClassCount"); /** * The total number of classes that have been loaded since the JVM started */ public static final Metric TOTAL_COUNT = Metric.define("LoadedClassCountTotal"); /** * The total number of classes that have been unloaded since the JVM started */ public static final Metric UNLOADED_COUNT = Metric.define("UnLoadedClassCountTotal"); @Override public void sense(final MetricContext metricContext) { ClassLoadingMXBean mxBean = ManagementFactory.getClassLoadingMXBean(); metricContext.record(CURRENT_COUNT, mxBean.getLoadedClassCount(), Unit.NONE); metricContext.record(TOTAL_COUNT, mxBean.getTotalLoadedClassCount(), Unit.NONE); metricContext.record(UNLOADED_COUNT, mxBean.getUnloadedClassCount(), Unit.NONE); } }