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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 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("Chunk")

    static class ChunkEvent extends Event {

        boolean end;

    }

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

        try (RecordingStream r = new RecordingStream()) {

            r.startAsync();

            // Create chunks with events in the repository

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

                try (Recording r1 = new Recording()) {

                    r1.start();

                    ChunkEvent e = new ChunkEvent();

                    e.end = false;

                    e.commit();

                    r1.stop();

                }

            }

            CountDownLatch endEventRecevied = new CountDownLatch(1);

            CountDownLatch emitEvent = new CountDownLatch(1);

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

                s.onEvent("Chunk", e -> {

                    if (e.getBoolean("end")) {

                        endEventRecevied.countDown();

                        return;

                    }

                    System.out.println("Stream should start at latest event:");

                    System.out.println(e);

                });

                ChunkEvent e1 = new ChunkEvent();

                e1.end = false;

                e1.commit();

                s.startAsync();

                s.onFlush(() -> {

                    emitEvent.countDown();

                });

                emitEvent.await();

                ChunkEvent e2 = new ChunkEvent();

                e2.end = true;

                e2.commit();

                endEventRecevied.await();

            }

        }

    }

}