test/jdk/jdk/jfr/api/recording/event/TestLoadEventAfterStart.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * 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.recording.event;

import java.lang.reflect.Constructor;
import java.time.Duration;
import java.util.ArrayList;
import java.util.List;

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 Load event class after recording started.
 * @key jfr
 * @library /test/lib
 * @build jdk.test.lib.jfr.SimpleEvent
 * @run main/othervm jdk.jfr.api.recording.event.TestLoadEventAfterStart
 */
public class TestLoadEventAfterStart {

    public static void main(String[] args) throws Throwable {
        Recording r = new Recording();
        r.start();

        ClassLoader classLoader = TestLoadEventAfterStart.class.getClassLoader();
        Class<? extends Event> eventClass =
            classLoader.loadClass("jdk.test.lib.jfr.SimpleEvent").asSubclass(Event.class);

        r.enable(eventClass).withThreshold(Duration.ofMillis(0)).withoutStackTrace();
        createEvent(eventClass, 1);
        r.disable(eventClass);
        createEvent(eventClass, 2);
        r.enable(eventClass).withThreshold(Duration.ofMillis(0)).withoutStackTrace();
        createEvent(eventClass, 3);

        r.stop();
        verifyEvents(r, 1, 3);
    }

    private static void verifyEvents(Recording r, int ... ids) throws Exception {
        List<Integer> eventIds = new ArrayList<>();
        for (RecordedEvent event : Events.fromRecording(r)) {
            int id = Events.assertField(event, "id").getValue();
            System.out.println("Event id:" + id);
            eventIds.add(id);
        }
        Asserts.assertEquals(eventIds.size(), ids.length, "Wrong number of events");
        for (int i = 0; i < ids.length; ++i) {
            Asserts.assertEquals(eventIds.get(i).intValue(), ids[i], "Wrong id in event");
        }
    }

    private static void createEvent(Class<? extends Event> eventClass, int id) throws Exception {
        Constructor<? extends Event> constructor = eventClass.getConstructor();
        Event event = (Event) constructor.newInstance();
        event.begin();
        eventClass.getDeclaredField("id").setInt(event, id);
        event.end();
        event.commit();
    }
}