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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 org.apache.log4j.Logger;
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import org.junit.Assert;
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import org.junit.Test;
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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 JvmMonitorTest extends Assert{
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public static final Logger logger = Logger.getLogger(JvmMonitorTest.class);
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@Test
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public void testGcTime() {
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JvmMonitor jvmMonitor = new JvmMonitor();
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assertNotEquals(-1l, jvmMonitor.gcTime());
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Runtime.getRuntime().gc();
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Runtime.getRuntime().gc();
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Runtime.getRuntime().gc();
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long gcTimeLast_1 = jvmMonitor.getGCtimeSiceLastCheck();
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assertTrue(gcTimeLast_1 > 0);
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Runtime.getRuntime().gc();
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Runtime.getRuntime().gc();
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Runtime.getRuntime().gc();
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long gcTimeLast_2 = jvmMonitor.getGCtimeSiceLastCheck();
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assertTrue(gcTimeLast_1 > 0);
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assertTrue(jvmMonitor.gcTime() > gcTimeLast_2);
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}
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@Test
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public void testHeapUsage() {
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int MB = 1024 * 1024;
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int failWithMB = 300 * MB;
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JvmMonitor jvmMonitor = new JvmMonitor();
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long baseline = jvmMonitor.getHeapMemoryUsage().getUsed();
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logger.debug("before: " + baseline);
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/*
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assertTrue(jvmMonitor.hasFreeHeap(0.9));
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logger.setLevel(Level.DEBUG);
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Object[] measure = new Object[MB]; // 1MB
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double bytePerObject = (jvmMonitor.getHeapMemoryUsage().getUsed() - baseline) / MB;
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long maxHeap = jvmMonitor.getHeapMemoryUsage().getMax();
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logger.debug("max: " + maxHeap);
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Object[] heapEater = new Object[(int)Math.round((failWithMB / bytePerObject))];
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logger.debug("after: " + jvmMonitor.getHeapMemoryUsage().getUsed());
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assertFalse(jvmMonitor.hasFreeHeap((failWithMB * 2) / (double)maxHeap));
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*/
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}
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}
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