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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * accompanied this code).

 *

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package jdk.jfr.api.consumer.streaming;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.atomic.AtomicBoolean;

import jdk.jfr.Event;

import jdk.jfr.Name;

import jdk.jfr.Recording;

import jdk.jfr.consumer.EventStream;

import jdk.jfr.consumer.RecordingStream;

/**

 * @test

 * @summary Verifies that a stream from a repository starts at the latest event

 * @key jfr

 * @requires vm.hasJFR

 * @library /test/lib

 * @run main/othervm jdk.jfr.api.consumer.streaming.TestLatestEvent

 */

public class TestLatestEvent {

    @Name("NotLatest")

    static class NotLatestEvent extends Event {

    }

    @Name("Latest")

    static class LatestEvent extends Event {

    }

    @Name("MakeChunks")

    static class MakeChunks extends Event {

    }

    public static void main(String... args) throws Exception {

        try (RecordingStream r = new RecordingStream()) {

            r.startAsync();

            MakeChunks e = new MakeChunks();

            e.commit();

            CountDownLatch beginChunks = new CountDownLatch(1);

            r.onEvent("MakeChunks", event-> {

                beginChunks.countDown();

            });

            System.out.println("Waitning for first chunk");

            beginChunks.await();

            // Create 5 chunks with events in the repository

            for (int i = 0; i < 5; i++) {

                System.out.println("Creating empty chunk");

                try (Recording r1 = new Recording()) {

                    r1.start();

                    NotLatestEvent notLatest = new NotLatestEvent();

                    notLatest.commit();

                    r1.stop();

                }

            }

            System.out.println("All empty chunks created");

            // Create an event in a segment, typically the first.

            NotLatestEvent notLatest = new NotLatestEvent();

            notLatest.commit();

            try (EventStream s = EventStream.openRepository()) {

                System.out.println("EventStream opened");

                AtomicBoolean foundLatest = new AtomicBoolean();

                s.onEvent(event -> {

                    String name = event.getEventType().getName();

                    System.out.println("Found event " + name);

                    foundLatest.set(name.equals("Latest"));

                    s.close();

                });

                // Emit the latest event

                LatestEvent latest = new LatestEvent();

                latest.commit();

                System.out.println("Latest event emitted");

                System.out.println("Waiting for termination");

                s.awaitTermination();

                if (!foundLatest.get()) {

                    throw new Exception("Didn't find latest event!");

                }

            }

        }

    }

        CountDownLatch latch = new CountDownLatch(1);

        System.out.println("Waiting for flush...");

            System.out.println("Flush arrived!");

            latch.countDown();

        latch.await();

    }

}