test/jdk/jdk/jfr/api/consumer/streaming/TestEmptyChunks.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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 * 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.Recording;
import jdk.jfr.consumer.RecordingStream;

/**
 * @test
 * @summary Test that it is possible to iterate over chunk without normal events
 * @key jfr
 * @requires vm.hasJFR
 * @library /test/lib
 * @run main/othervm jdk.jfr.api.consumer.streaming.TestEmptyChunks
 */
public class TestEmptyChunks {
    static class EndEvent extends Event {
    }

    public static void main(String... args) throws Exception {
        CountDownLatch end = new CountDownLatch(1);
        CountDownLatch firstFlush = new CountDownLatch(1);
        try (RecordingStream es = new RecordingStream()) {
            es.onEvent(EndEvent.class.getName(), e -> {
                end.countDown();
            });
            es.onFlush(() -> {
                firstFlush.countDown();
            });
            es.startAsync();
            System.out.println("Invoked startAsync()");
            // Wait for stream thread to start
            firstFlush.await();
            System.out.println("Stream thread active");
            Recording r1 = new Recording();
            r1.start();
            System.out.println("Chunk 1 started");
            Recording r2 = new Recording();
            r2.start();
            System.out.println("Chunk 2 started");
            Recording r3 = new Recording();
            r3.start();
            System.out.println("Chunk 3 started");
            r2.stop();
            System.out.println("Chunk 4 started");
            r3.stop();
            System.out.println("Chunk 5 started");
            EndEvent e = new EndEvent();
            e.commit();
            end.await();
            r1.stop();
            System.out.println("Chunk 5 ended");
            r1.close();
            r2.close();
            r3.close();
        }
    }
}