jdk

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/*
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 * Copyright (c) 2020, 2022, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package gc.x;
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/**
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 * @test TestMemoryManagerMXBean
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 * @requires vm.gc.ZSinglegen
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 * @summary Test ZGC memory manager MXBean
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 * @modules java.management
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 * @run main/othervm -XX:+UseZGC -XX:-ZGenerational -Xmx128M gc.x.TestMemoryManagerMXBean
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 */
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import java.lang.management.ManagementFactory;
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public class TestMemoryManagerMXBean {
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    private static void checkName(String name) throws Exception {
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        if (name == null || name.length() == 0) {
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            throw new Exception("Invalid name");
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        }
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    }
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    public static void main(String[] args) throws Exception {
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        int zgcCyclesMemoryManagers = 0;
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        int zgcPausesMemoryManagers = 0;
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        int zgcCyclesMemoryPools = 0;
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        int zgcPausesMemoryPools = 0;
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        for (final var memoryManager : ManagementFactory.getMemoryManagerMXBeans()) {
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            final var memoryManagerName = memoryManager.getName();
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            checkName(memoryManagerName);
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            System.out.println("MemoryManager: " + memoryManagerName);
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            if (memoryManagerName.equals("ZGC Cycles")) {
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                zgcCyclesMemoryManagers++;
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            } else if (memoryManagerName.equals("ZGC Pauses")) {
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                zgcPausesMemoryManagers++;
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            }
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            for (final var memoryPoolName : memoryManager.getMemoryPoolNames()) {
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                checkName(memoryPoolName);
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                System.out.println("   MemoryPool:   " + memoryPoolName);
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                if (memoryPoolName.equals("ZHeap")) {
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                    if (memoryManagerName.equals("ZGC Cycles")) {
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                        zgcCyclesMemoryPools++;
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                    } else if (memoryManagerName.equals("ZGC Pauses")) {
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                        zgcPausesMemoryPools++;
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                    }
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                }
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            }
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        }
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        if (zgcCyclesMemoryManagers != 1) {
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            throw new Exception("Unexpected number of cycle MemoryManagers");
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        }
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        if (zgcPausesMemoryManagers != 1) {
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            throw new Exception("Unexpected number of pause MemoryManagers");
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        }
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        if (zgcCyclesMemoryPools != 1) {
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            throw new Exception("Unexpected number of cycle MemoryPools");
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        }
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        if (zgcPausesMemoryPools != 1) {
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            throw new Exception("Unexpected number of pause MemoryPools");
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        }
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    }
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}
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