cdmlib-commons/src/test/java/eu/etaxonomy/cdm/common/JvmMonitorTest.java

   1 /**
   2 * Copyright (C) 2016 EDIT
   3 * European Distributed Institute of Taxonomy
   4 * http://www.e-taxonomy.eu
   5 *
   6 * The contents of this file are subject to the Mozilla Public License Version 1.1
   7 * See LICENSE.TXT at the top of this package for the full license terms.
   8 */
   9 package eu.etaxonomy.cdm.common;
  10
  11 import org.apache.logging.log4j.LogManager;
  12 import org.apache.logging.log4j.Logger;
  13 import org.junit.Assert;
  14 import org.junit.Test;
  15
  16 /**
  17  * @author a.kohlbecker
  18  * @since Jul 1, 2016
  19  *
  20  */
  21 public class JvmMonitorTest extends Assert{
  22
  23
  24     public static final Logger logger = LogManager.getLogger(JvmMonitorTest.class);
  25
  26     @Test
  27     public void testGcTime() {
  28         JvmMonitor jvmMonitor = new JvmMonitor();
  29         assertNotEquals(-1l, jvmMonitor.gcTime());
  30
  31         Runtime.getRuntime().gc();
  32         Runtime.getRuntime().gc();
  33         Runtime.getRuntime().gc();
  34         long gcTimeLast_1 = jvmMonitor.getGCtimeSiceLastCheck();
  35         assertTrue(gcTimeLast_1 > 0);
  36         Runtime.getRuntime().gc();
  37         Runtime.getRuntime().gc();
  38         Runtime.getRuntime().gc();
  39         long gcTimeLast_2 = jvmMonitor.getGCtimeSiceLastCheck();
  40         assertTrue(gcTimeLast_1 > 0);
  41         assertTrue(jvmMonitor.gcTime() > gcTimeLast_2);
  42
  43     }
  44
  45     @Test
  46     public void testHeapUsage() {
  47         int MB = 1024 * 1024;
  48         int failWithMB = 300 * MB;
  49         JvmMonitor jvmMonitor = new JvmMonitor();
  50
  51         long baseline = jvmMonitor.getHeapMemoryUsage().getUsed();
  52         logger.debug("before: " + baseline);
  53 /*
  54         assertTrue(jvmMonitor.hasFreeHeap(0.9));
  55
  56         logger.setLevel(Level.DEBUG);
  57
  58         Object[] measure = new Object[MB]; // 1MB
  59         double bytePerObject = (jvmMonitor.getHeapMemoryUsage().getUsed() - baseline) / MB;
  60         long maxHeap = jvmMonitor.getHeapMemoryUsage().getMax();
  61         logger.debug("max: " + maxHeap);
  62         Object[] heapEater = new Object[(int)Math.round((failWithMB / bytePerObject))];
  63         logger.debug("after: " + jvmMonitor.getHeapMemoryUsage().getUsed());
  64
  65         assertFalse(jvmMonitor.hasFreeHeap((failWithMB * 2) / (double)maxHeap));
  66 */
  67
  68     }
  69
  70 }