test/jdk/jdk/jfr/api/consumer/TestSingleRecordedEvent.java

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package jdk.jfr.api.consumer;

import java.util.List;

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

/**
 * @test
 * @summary Verifies that a single JFR event is recorded as expected
 * @key jfr
 * @requires vm.hasJFR
 * @library /test/lib
 * @run main/othervm jdk.jfr.api.consumer.TestSingleRecordedEvent
 */
public class TestSingleRecordedEvent {

    @Description("MyDescription")
    private static class MyEvent extends Event {
    }

    public static void main(String[] args) throws Throwable {
        Recording r = new Recording();
        r.start();
        // Commit a single event to the recording
        MyEvent event = new MyEvent();
        event.commit();
        r.stop();
        List<RecordedEvent> events = Events.fromRecording(r);
        Events.hasEvents(events);

        // Should be 1 event only
        Asserts.assertEquals(events.size(), 1);

        RecordedEvent recordedEvent = events.get(0);

        // Event description should be the same
        Asserts.assertEquals(recordedEvent.getEventType().getDescription(), "MyDescription");
    }
}