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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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package jdk.jfr.event.gc.collection;

import java.lang.management.ManagementFactory;
import java.util.List;

import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.test.lib.Asserts;
import jdk.test.lib.jfr.EventNames;
import jdk.test.lib.jfr.Events;

/**
 * @test
 * @requires vm.flagless
 * @requires vm.hasJFR
 * @library /test/lib /test/jdk
 * @run main/othervm -XX:+ExplicitGCInvokesConcurrent jdk.jfr.event.gc.collection.TestSystemGC true
 * @run main/othervm -XX:-ExplicitGCInvokesConcurrent jdk.jfr.event.gc.collection.TestSystemGC false
 */
public class TestSystemGC {
    public static void main(String[] args) throws Exception {
        boolean concurrent = Boolean.valueOf(args[0]);
        try (Recording recording = new Recording()) {
            recording.enable(EventNames.SystemGC);
            recording.start();

            // Trigger 3 System GC
            System.gc();
            ManagementFactory.getMemoryMXBean().gc();
            Runtime.getRuntime().gc();

            recording.stop();
            List<RecordedEvent> events = Events.fromRecording(recording);
            System.out.println(events);

            Asserts.assertEquals(3, events.size(), "Expected 3 SystemGC events");

            RecordedEvent event1 = events.getFirst();
            Events.assertFrame(event1, System.class, "gc");
            Events.assertEventThread(event1, Thread.currentThread());
            Events.assertField(event1, "invokedConcurrent").isEqual(concurrent);

            RecordedEvent event2 = events.get(1);
            Events.assertFrame(event2, Runtime.class, "gc");
            Events.assertEventThread(event2, Thread.currentThread());
            Events.assertField(event2, "invokedConcurrent").isEqual(concurrent);

            RecordedEvent event3 = events.get(2);
            // MemoryMXBean.class is an interface so can't assertFrame on it
            Events.assertEventThread(event3, Thread.currentThread());
            Events.assertField(event3, "invokedConcurrent").isEqual(concurrent);
        }
     }
}
