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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * 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.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();
            }
        }
    }
}