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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
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package jdk.jfr.event.gc.collection;

import static jdk.testlibrary.Asserts.assertGreaterThan;
import static jdk.testlibrary.Asserts.assertTrue;

import java.time.Duration;
import java.time.Instant;

import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.testlibrary.jfr.Events;
import jdk.testlibrary.jfr.GCHelper;


public class YoungGarbageCollectionEvent {

    private static final String EVENT_NAME = GCHelper.event_young_garbage_collection;

    public static void test() throws Exception {
        Recording recording = new Recording();
        recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(0));
        recording.start();
        triggerGC();
        recording.stop();

        boolean isAnyFound = false;
        for (RecordedEvent event : Events.fromRecording(recording)) {
            if (!EVENT_NAME.equals(event.getEventType().getName())) {
                continue;
            }
            System.out.println("Event: " + event);
            isAnyFound = true;
            Events.assertField(event, "gcId").atLeast(0);
            Events.assertField(event, "tenuringThreshold").atLeast(1);

            Instant startTime = event.getStartTime();
            Instant endTime = event.getEndTime();
            Duration duration = event.getDuration();
            assertGreaterThan(startTime, Instant.EPOCH, "startTime should be at least 0");
            assertGreaterThan(endTime, Instant.EPOCH, "endTime should be at least 0");
            // TODO: Maybe we should accept duration of 0, but old test did not.
            assertGreaterThan(duration, Duration.ZERO, "Duration should be above 0");
            assertGreaterThan(endTime, startTime, "End time should be after start time");
        }
        assertTrue(isAnyFound, "No matching event found");
    }

    public static byte[] garbage;
    private static void triggerGC() {
        for (int i = 0; i < 3072; i++) {
            garbage = new byte[1024];
        }
    }
}