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/**
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* Copyright (C) 2016 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.common;
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import java.lang.management.GarbageCollectorMXBean;
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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.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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* @since Jul 1, 2016
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*
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*/
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public class JvmMonitor {
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public static final Logger logger = Logger.getLogger(JvmMonitor.class);
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private long gcTimeLast = 0;
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private long lastCheckTime = 0;
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/**
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* Returns the sum of approximate accumulated collection elapsed time in milliseconds
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* as reported by all garbage collectors.
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*
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* This method returns -1 if the collection elapsed time is undefined.
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*
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* @return
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*/
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public long gcTime() {
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List<GarbageCollectorMXBean> gcMXBeans = ManagementFactory.getGarbageCollectorMXBeans();
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//logger.setLevel(Level.DEBUG);
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long gcTimeSum = -1;
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long collectorGcTime;
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for(GarbageCollectorMXBean gcMXBean : gcMXBeans){
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if(gcTimeSum == -1) {
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gcTimeSum = 0;
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}
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collectorGcTime = gcMXBean.getCollectionTime();
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logger.debug("cgMxBean: " + gcMXBean.getName()
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+ " gcTime = " + collectorGcTime
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+ " gcCount = " + gcMXBean.getCollectionCount());
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if(collectorGcTime != -1) {
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// only sum up if the time is defined
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gcTimeSum += gcMXBean.getCollectionTime();
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}
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}
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logger.debug("gcTimeSum = " + gcTimeSum);
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return gcTimeSum;
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}
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public MemoryUsage getHeapMemoryUsage(){
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MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
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if(memoryMXBean != null){
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logger.debug("HeapMemoryUsage: " + 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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public boolean hasFreeHeap(long freeHeapLimit) {
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if(!_hasFreeHeap(freeHeapLimit)) {
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Runtime.getRuntime().gc();
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return _hasFreeHeap(freeHeapLimit);
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}
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return true;
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}
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/**
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* @param maxUsedFraction
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* @return
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*/
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private boolean _hasFreeHeap(long freeHeapLimit) {
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long freeHeap = getFreeHeap(false);
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return freeHeap > freeHeapLimit;
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}
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/**
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* @return
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*/
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public long getFreeHeap(boolean gcBeforeMeasure) {
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if(gcBeforeMeasure) {
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Runtime.getRuntime().gc();
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}
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MemoryUsage heapUsage = getHeapMemoryUsage();
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long freeHeap = heapUsage.getMax() - heapUsage.getUsed();
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return freeHeap;
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}
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/**
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* Returns the gcTime in milliseconds as obtained through {@link #gctime()} of the
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* time interval since this method has been called the last time and now.
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*
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* @return
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*/
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public long getGCtimeSiceLastCheck() {
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long gcTimeNow = gcTime();
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long gcTimeSince = gcTimeNow - gcTimeLast;
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gcTimeLast = gcTimeNow;
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lastCheckTime = System.currentTimeMillis();
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return gcTimeSince;
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}
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/**
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* Returns the time spend in gc as proportion (0.0 to 1.0) of the
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* time interval since this method has been called the last time and now.
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*
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* @return
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*/
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public double getGCRateSiceLastCheck() {
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long gcTimeSince = getGCtimeSiceLastCheck();
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long timeDiff = System.currentTimeMillis() - lastCheckTime;
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double gcRate = gcTimeSince / (double) timeDiff;
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return gcRate;
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}
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}
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