test/hotspot/jtreg/gc/TestMemoryMXBeansAndPoolsPresence.java

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import java.util.List;
import java.util.ArrayList;
import java.lang.management.*;
import static jdk.test.lib.Asserts.*;
import java.util.stream.*;

/* @test TestMemoryMXBeansAndPoolsPresence
 * @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 == null
 * @run main/othervm -XX:+UseG1GC TestMemoryMXBeansAndPoolsPresence G1
 * @run main/othervm -XX:+UseParallelGC TestMemoryMXBeansAndPoolsPresence Parallel
 * @run main/othervm -XX:+UseSerialGC TestMemoryMXBeansAndPoolsPresence Serial
 */

/* @test TestMemoryMXBeansAndPoolsPresenceCMS
 * @bug 8191564
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @comment Graal does not support CMS
 * @requires vm.gc == null & !vm.graal.enabled
 * @run main/othervm -XX:+UseConcMarkSweepGC TestMemoryMXBeansAndPoolsPresence CMS
 */

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 "CMS":
                test(new GCBeanDescription("ParNew",              new String[] {"Par Eden Space", "Par Survivor Space"}),
                     new GCBeanDescription("ConcurrentMarkSweep", new String[] {"Par Eden Space", "Par Survivor Space", "CMS 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;

        }
    }
}