1 /* 2 * Copyright (c) 2020, 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 /** 25 * @test TestMemoryManagerMXBean 26 * @requires vm.gc.Z 27 * @summary Test ZGC memory manager MXBean 28 * @modules java.management 29 * @run main/othervm -XX:+UseZGC -Xmx128M TestMemoryManagerMXBean 30 */ 31 32 import java.lang.management.ManagementFactory; 33 34 public class TestMemoryManagerMXBean { 35 private static void checkName(String name) throws Exception { 36 if (name == null || name.length() == 0) { 37 throw new Exception("Invalid name"); 38 } 39 } 40 41 public static void main(String[] args) throws Exception { 42 int zgcMemoryManagers = 0; 43 int zgcMemoryPools = 0; 44 45 for (final var memoryManager : ManagementFactory.getMemoryManagerMXBeans()) { 46 final var memoryManagerName = memoryManager.getName(); 47 checkName(memoryManagerName); 48 49 System.out.println("MemoryManager: " + memoryManagerName); 50 51 if (memoryManagerName.equals("ZGC")) { 52 zgcMemoryManagers++; 53 } 54 55 for (final var memoryPoolName : memoryManager.getMemoryPoolNames()) { 56 checkName(memoryPoolName); 57 58 System.out.println(" MemoryPool: " + memoryPoolName); 59 60 if (memoryPoolName.equals("ZHeap")) { 61 zgcMemoryPools++; 62 } 63 } 64 65 if (zgcMemoryManagers != zgcMemoryPools) { 66 throw new Exception("MemoryManagers/MemoryPools mismatch"); 67 } 68 } 69 70 if (zgcMemoryManagers != 1) { 71 throw new Exception("All MemoryManagers not found"); 72 } 73 74 if (zgcMemoryPools != 1) { 75 throw new Exception("All MemoryPools not found"); 76 } 77 } 78 }