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/**
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* Copyright (C) 2009 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.server;
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import java.lang.management.ManagementFactory;
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import java.lang.management.MemoryMXBean;
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import java.lang.management.MemoryPoolMXBean;
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import java.lang.management.MemoryUsage;
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import java.util.List;
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import org.apache.log4j.Logger;
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/**
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* @author a.kohlbecker
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* @date 30.07.2010
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*/
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public class JvmManager {
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// Java 7
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private static final String SUFFIX_PERM_GEN = "Perm Gen";
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// Java > 8
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private static final String SUFFIX_META = "Metaspace";
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public static final Logger logger = Logger.getLogger(JvmManager.class);
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public static MemoryUsage getPermGenSpaceUsage(){
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return getMemoryPoolUsage(SUFFIX_PERM_GEN);
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}
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public static MemoryUsage getMetaSpaceUsage(){
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return getMemoryPoolUsage(SUFFIX_META);
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}
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protected static MemoryUsage getMemoryPoolUsage(String nameSuffix) {
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List<MemoryPoolMXBean> memoryPoolMXBeans = ManagementFactory.getMemoryPoolMXBeans();
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for(MemoryPoolMXBean memoryPoolMXBean : memoryPoolMXBeans){
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if(memoryPoolMXBean.getName().endsWith(nameSuffix)){
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logger.debug(memoryPoolMXBean.getName()
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+ ": init= " + memoryPoolMXBean.getUsage().getInit()
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+ ", used= "+ memoryPoolMXBean.getUsage().getUsed()
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+ ", max= "+ memoryPoolMXBean.getUsage().getMax()
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+ ", committed= "+memoryPoolMXBean.getUsage().getCommitted());
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return memoryPoolMXBean.getUsage();
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}
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}
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return null;
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}
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public static MemoryUsage getHeapMemoryUsage(){
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MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
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if(memoryMXBean != null){
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logger.debug("NonHeapMemoryUsage: "+memoryMXBean.getHeapMemoryUsage());
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return memoryMXBean.getHeapMemoryUsage();
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}
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return null;
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}
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/**
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*
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* Note, however, that this does not distinguish virtual cores from physical cores. so, for example,
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* if your machine has hyperthreading enabled you will see double the number of physical cores.
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*
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* see https://community.oracle.com/thread/2141632?start=0&tstart=0
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*
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* @return
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*/
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public static int availableProcessors() {
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return Runtime.getRuntime().availableProcessors();
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}
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public static Integer getJvmVersion() {
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return Integer.parseInt(System.getProperty("java.version").split("\\.")[1]);
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// alternatively System.getProperty("java.specification.version");
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}
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}
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