test/jdk/jdk/jfr/api/consumer/recordingstream/TestRecursive.java

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package jdk.jfr.api.consumer.recordingstream;

import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;

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

/**
 * @test
 * @summary Tests that events are not emitted in handlers
 * @key jfr
 * @requires vm.hasJFR
 * @library /test/lib /test/jdk
 * @build jdk.jfr.api.consumer.recordingstream.EventProducer
 * @run main/othervm jdk.jfr.api.consumer.recordingstream.TestRecursive
 */
public class TestRecursive {

    public static class NotRecorded extends Event {
    }

    public static class Recorded extends Event {
    }

    public static class Provoker extends Event {
    }

    public static void main(String... args) throws Exception {
        testSync();
        testAsync();
        testStreamInStream();
    }

    private static void testStreamInStream() throws Exception {
        CountDownLatch latch = new CountDownLatch(1);
        try (Recording r = new Recording()) {
            r.start();
            Recorded r1 = new Recorded(); // 1
            r1.commit();
            try (RecordingStream rs = new RecordingStream()) {
                rs.onEvent(e1 -> {
                    streamInStream();
                    latch.countDown();
                });
                rs.startAsync();
                Recorded r2 = new Recorded(); // 2
                r2.commit();
                latch.await();
            }
            Recorded r3 = new Recorded(); // 2
            r3.commit();
            r.stop();
            List<RecordedEvent> events = Events.fromRecording(r);
            if (count(events, NotRecorded.class) != 0) {
                throw new Exception("Expected 0 NotRecorded events");
            }
            if (count(events, Recorded.class) != 3) {
                throw new Exception("Expected 3 Recorded events");
            }
        }
    }

    // No events should be recorded in this method
    private static void streamInStream() {
        NotRecorded nr1 = new NotRecorded();
        nr1.commit();
        CountDownLatch latch = new CountDownLatch(1);
        try (RecordingStream rs2 = new RecordingStream()) {
            rs2.onEvent(e2 -> {
                NotRecorded nr2 = new NotRecorded();
                nr2.commit();
                latch.countDown();
            });
            NotRecorded nr3 = new NotRecorded();
            nr3.commit();
            rs2.startAsync();
            // run event in separate thread
            CompletableFuture.runAsync(() -> {
                Provoker p = new Provoker();
                p.commit();
            });
            try {
                latch.await();
            } catch (InterruptedException e) {
                throw new Error("Unexpected interruption", e);
            }
        }
        NotRecorded nr2 = new NotRecorded();
        nr2.commit();
    }

    private static void testSync() throws Exception {
        try (Recording r = new Recording()) {
            r.start();
            EventProducer p = new EventProducer();
            try (RecordingStream rs = new RecordingStream()) {
                Recorded e1 = new Recorded();
                e1.commit();
                rs.onEvent(e -> {
                    System.out.println("Emitting NotRecorded event");
                    NotRecorded event = new NotRecorded();
                    event.commit();
                    System.out.println("Stopping event provoker");
                    p.kill();
                    System.out.println("Closing recording stream");
                    rs.close();
                    return;
                });
                p.start();
                rs.start();
                Recorded e2 = new Recorded();
                e2.commit();
            }
            r.stop();
            List<RecordedEvent> events = Events.fromRecording(r);
            System.out.println(events);
            if (count(events, NotRecorded.class) != 0) {
                throw new Exception("Expected 0 NotRecorded events");
            }
            if (count(events, Recorded.class) != 2) {
                throw new Exception("Expected 2 Recorded events");
            }
        }
    }

    private static int count(List<RecordedEvent> events, Class<?> eventClass) {
        int count = 0;
        for (RecordedEvent e : events) {
            if (e.getEventType().getName().equals(eventClass.getName())) {
                count++;
            }
        }
        System.out.println(count);
        return count;
    }

    private static void testAsync() throws InterruptedException, Exception {
        CountDownLatch latchOne = new CountDownLatch(1);
        CountDownLatch latchTwo = new CountDownLatch(2);
        AtomicBoolean fail = new AtomicBoolean();
        try (RecordingStream r = new RecordingStream()) {
            r.onEvent(e -> {
                System.out.println(e);
                NotRecorded event = new NotRecorded();
                event.commit();
                if (e.getEventType().getName().equals(Recorded.class.getName())) {
                    latchOne.countDown();
                    latchTwo.countDown();
                }
                if (e.getEventType().getName().equals(NotRecorded.class.getName())) {
                    fail.set(true);
                }
            });
            r.startAsync();
            Recorded e1 = new Recorded();
            e1.commit();
            latchOne.await();
            Recorded e2 = new Recorded();
            e2.commit();
            latchTwo.await();
            if (fail.get()) {
                throw new Exception("Unexpected event found");
            }
        }
    }
}