/*

 * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 * questions.

 */

package gc;

import java.util.List;

import java.lang.management.*;

import static jdk.test.lib.Asserts.*;

import java.util.stream.*;

/* @test TestMemoryMXBeansAndPoolsPresenceG1

 * @bug 8191564

 * @summary Tests that GarbageCollectorMXBeans and GC MemoryPools are created.

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @requires vm.gc.G1

 * @run main/othervm -XX:+UseG1GC gc.TestMemoryMXBeansAndPoolsPresence G1

 */

/* @test TestMemoryMXBeansAndPoolsPresenceParallel

 * @bug 8191564

 * @summary Tests that GarbageCollectorMXBeans and GC MemoryPools are created.

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @requires vm.gc.Parallel

 * @run main/othervm -XX:+UseParallelGC gc.TestMemoryMXBeansAndPoolsPresence Parallel

 */

/* @test TestMemoryMXBeansAndPoolsPresenceSerial

 * @bug 8191564

 * @summary Tests that GarbageCollectorMXBeans and GC MemoryPools are created.

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @requires vm.gc.Serial

 * @run main/othervm -XX:+UseSerialGC gc.TestMemoryMXBeansAndPoolsPresence Serial

 */

class GCBeanDescription {

    public String name;

    public String[] poolNames;

    public GCBeanDescription(String name, String[] poolNames) {

        this.name = name;

        this.poolNames = poolNames;

    }

}

public class TestMemoryMXBeansAndPoolsPresence {

    public static void test(GCBeanDescription... expectedBeans) {

        List<MemoryPoolMXBean> memoryPools = ManagementFactory.getMemoryPoolMXBeans();

        List<GarbageCollectorMXBean> gcBeans = ManagementFactory.getGarbageCollectorMXBeans();

        assertEQ(expectedBeans.length, gcBeans.size());

        for (GCBeanDescription desc : expectedBeans) {

            List<GarbageCollectorMXBean> beans = gcBeans.stream()

                                                        .filter(b -> b.getName().equals(desc.name))

                                                        .collect(Collectors.toList());

            assertEQ(beans.size(), 1);

            GarbageCollectorMXBean bean = beans.get(0);

            assertEQ(desc.name, bean.getName());

            String[] pools = bean.getMemoryPoolNames();

            assertEQ(desc.poolNames.length, pools.length);

            for (int i = 0; i < desc.poolNames.length; i++) {

                assertEQ(desc.poolNames[i], pools[i]);

            }

        }

    }

    public static void main(String[] args) {

        switch (args[0]) {

            case "G1":

                test(new GCBeanDescription("G1 Young Generation", new String[] {"G1 Eden Space", "G1 Survivor Space", "G1 Old Gen"}),

                     new GCBeanDescription("G1 Old Generation",   new String[] {"G1 Eden Space", "G1 Survivor Space", "G1 Old Gen"}));

                break;

            case "Parallel":

                test(new GCBeanDescription("PS Scavenge",         new String[] {"PS Eden Space", "PS Survivor Space"}),

                     new GCBeanDescription("PS MarkSweep",        new String[] {"PS Eden Space", "PS Survivor Space", "PS Old Gen"}));

                break;

            case "Serial":

                test(new GCBeanDescription("Copy",              new String[] {"Eden Space", "Survivor Space"}),

                     new GCBeanDescription("MarkSweepCompact",  new String[] {"Eden Space", "Survivor Space", "Tenured Gen"}));

                break;

            default:

                assertTrue(false);

                break;

        }

    }

}