test/jdk/jdk/jfr/api/consumer/streaming/TestChunkGap.java

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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.time.Instant;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicInteger;

import jdk.jfr.Event;
import jdk.jfr.Recording;
import jdk.jfr.consumer.EventStream;

/**
 * @test
 * @summary Tests that a stream can gracefully handle chunk being removed in the
 *          middle
 * @key jfr
 * @requires vm.hasJFR
 * @library /test/lib
 * @run main/othervm jdk.jfr.api.consumer.streaming.TestFilledChunks
 */
public class TestChunkGap {

    static class StartEvent extends Event {
    }

    static class TestGapEvent extends Event {
    }

    static class EndEvent extends Event {
    }

    private final static AtomicInteger count = new AtomicInteger(0);

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

        CountDownLatch gap = new CountDownLatch(1);
        CountDownLatch receivedEvent = new CountDownLatch(1);

        try (EventStream s = EventStream.openRepository()) {
            try (Recording r1 = new Recording()) {
                s.setStartTime(Instant.EPOCH);
                s.onEvent(e -> {
                    System.out.println(e);
                    receivedEvent.countDown();
                    try {
                        gap.await();
                    } catch (InterruptedException e1) {
                        e1.printStackTrace();
                    }
                    count.incrementAndGet();
                    if (e.getEventType().getName().equals(EndEvent.class.getName())) {
                        s.close();
                    }
                });
                s.startAsync();
                r1.start();
                StartEvent event1 = new StartEvent();
                event1.commit();
                receivedEvent.await();
                r1.stop();

                // create chunk that is removed
                try (Recording r2 = new Recording()) {
                    r2.enable(TestGapEvent.class);
                    r2.start();
                    TestGapEvent event2 = new TestGapEvent();
                    event2.commit();
                    r2.stop();
                }
                gap.countDown();
                try (Recording r3 = new Recording()) {
                    r3.enable(EndEvent.class);
                    r3.start();
                    EndEvent event3 = new EndEvent();
                    event3.commit();
                    r3.stop();

                    s.awaitTermination();
                    if (count.get() != 2) {
                        throw new AssertionError("Expected 2 event, but got " + count);
                    }
                }
            }
        }
    }

}