test/jdk/jdk/jfr/api/event/TestEventDuration.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * 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).
 *
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package jdk.jfr.api.event;

import java.util.List;

import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.test.lib.jfr.Events;
import jdk.test.lib.jfr.SimpleEvent;

/**
 * @test
 * @summary Tests that a duration is recorded.
 * @key jfr
 * @requires vm.hasJFR
 * @library /test/lib
 * @run main/othervm jdk.jfr.api.event.TestEventDuration
 */
public class TestEventDuration {

    public static int counter;

    public static void main(String[] args) throws Exception {

        try(Recording r = new Recording()) {
            r.start();
            SimpleEvent e = new SimpleEvent();
            e.begin();
            for (int i = 0; i < 10_000;i++) {
                counter+=i;
            }
            e.end();
            e.commit();

            r.stop();
            List<RecordedEvent> events = Events.fromRecording(r);
            if (events.get(0).getDuration().toNanos() < 1) {
                throw new AssertionError("Expected a duration");
            }
        }

    }

}