1 /*
   2  * Copyright (c) 2017, 2018, Red Hat, Inc. 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 
  25 package gc.epsilon;
  26 
  27 /**
  28  * @test TestMemoryPools
  29  * @requires vm.gc.Epsilon
  30  * @summary Test JMX memory pools
  31  * @modules java.base/jdk.internal.misc
  32  *          java.management
  33  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -Xmx1g -Xms1g gc.epsilon.TestMemoryPools
  34  */
  35 
  36 import java.lang.management.*;
  37 import java.util.*;
  38 
  39 public class TestMemoryPools {
  40 
  41     public static void main(String[] args) throws Exception {
  42         List<MemoryManagerMXBean> mms = ManagementFactory.getMemoryManagerMXBeans();
  43         if (mms == null) {
  44             throw new RuntimeException("getMemoryManagerMXBeans is null");
  45         }
  46         if (mms.isEmpty()) {
  47             throw new RuntimeException("getMemoryManagerMXBeans is empty");
  48         }
  49         for (MemoryManagerMXBean mmBean : mms) {
  50             String[] names = mmBean.getMemoryPoolNames();
  51             if (names == null) {
  52                 throw new RuntimeException("getMemoryPoolNames() is null");
  53             }
  54             if (names.length == 0) {
  55                 throw new RuntimeException("getMemoryPoolNames() is empty");
  56             }
  57             for (String name : names) {
  58                 if (name == null) {
  59                     throw new RuntimeException("pool name is null");
  60                 }
  61                 if (name.length() == 0) {
  62                     throw new RuntimeException("pool name is empty");
  63                 }
  64             }
  65         }
  66     }
  67 }