1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.util.List;
  25 import java.util.ArrayList;
  26 import java.lang.management.*;
  27 import static jdk.test.lib.Asserts.*;
  28 import java.util.stream.*;
  29 
  30 /* @test TestMemoryMXBeansAndPoolsPresence
  31  * @bug 8191564
  32  * @summary Tests that GarbageCollectorMXBeans and GC MemoryPools are created.
  33  * @library /test/lib
  34  * @modules java.base/jdk.internal.misc
  35  *          java.management
  36  * @run main/othervm -XX:+UseG1GC TestMemoryMXBeansAndPoolsPresence G1
  37  * @run main/othervm -XX:+UseConcMarkSweepGC TestMemoryMXBeansAndPoolsPresence CMS
  38  * @run main/othervm -XX:+UseParallelGC TestMemoryMXBeansAndPoolsPresence Parallel
  39  * @run main/othervm -XX:+UseSerialGC TestMemoryMXBeansAndPoolsPresence Serial
  40  */
  41 
  42 class GCBeanDescription {
  43     public String name;
  44     public String[] poolNames;
  45 
  46     public GCBeanDescription(String name, String[] poolNames) {
  47         this.name = name;
  48         this.poolNames = poolNames;
  49     }
  50 }
  51 
  52 public class TestMemoryMXBeansAndPoolsPresence {
  53     public static void test(GCBeanDescription... expectedBeans) {
  54         List<MemoryPoolMXBean> memoryPools = ManagementFactory.getMemoryPoolMXBeans();
  55 
  56         List<GarbageCollectorMXBean> gcBeans = ManagementFactory.getGarbageCollectorMXBeans();
  57         assertEQ(expectedBeans.length, gcBeans.size());
  58 
  59         for (GCBeanDescription desc : expectedBeans) {
  60             List<GarbageCollectorMXBean> beans = gcBeans.stream()
  61                                                         .filter(b -> b.getName().equals(desc.name))
  62                                                         .collect(Collectors.toList());
  63             assertEQ(beans.size(), 1);
  64 
  65             GarbageCollectorMXBean bean = beans.get(0);
  66             assertEQ(desc.name, bean.getName());
  67 
  68             String[] pools = bean.getMemoryPoolNames();
  69             assertEQ(desc.poolNames.length, pools.length);
  70             for (int i = 0; i < desc.poolNames.length; i++) {
  71                 assertEQ(desc.poolNames[i], pools[i]);
  72             }
  73         }
  74     }
  75 
  76     public static void main(String[] args) {
  77         switch (args[0]) {
  78             case "G1":
  79                 test(new GCBeanDescription("G1 Young Generation", new String[] {"G1 Eden Space", "G1 Survivor Space"}),
  80                      new GCBeanDescription("G1 Old Generation",   new String[] {"G1 Eden Space", "G1 Survivor Space", "G1 Old Gen"}));
  81                 break;
  82             case "CMS":
  83                 test(new GCBeanDescription("ParNew",              new String[] {"Par Eden Space", "Par Survivor Space"}),
  84                      new GCBeanDescription("ConcurrentMarkSweep", new String[] {"Par Eden Space", "Par Survivor Space", "CMS Old Gen"}));
  85                 break;
  86             case "Parallel":
  87                 test(new GCBeanDescription("PS Scavenge",         new String[] {"PS Eden Space", "PS Survivor Space"}),
  88                      new GCBeanDescription("PS MarkSweep",        new String[] {"PS Eden Space", "PS Survivor Space", "PS Old Gen"}));
  89                 break;
  90             case "Serial":
  91                 test(new GCBeanDescription("Copy",              new String[] {"Eden Space", "Survivor Space"}),
  92                      new GCBeanDescription("MarkSweepCompact",  new String[] {"Eden Space", "Survivor Space", "Tenured Gen"}));
  93                 break;
  94             default:
  95                 assertTrue(false);
  96                 break;
  97 
  98         }
  99     }
 100 }