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

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 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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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.consumer.RecordingStream;

/**

 * @test

 * @summary Tests that a stream can gracefully handle chunk being removed

 * @key jfr

 * @requires vm.hasJFR

 * @library /test/lib

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

 */

public class TestRemovedChunks {

    private final static CountDownLatch parkLatch = new CountDownLatch(1);

    private final static CountDownLatch removalLatch = new CountDownLatch(1);

    private final static CountDownLatch IfeelFineLatch = new CountDownLatch(1);

    static class DataEvent extends Event {

        double double1;

        double double2;

        double double3;

        double double4;

        double double5;

    }

    static class ParkStream extends Event {

    }

    static class IFeelFine extends Event {

    }

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

        try (RecordingStream s = new RecordingStream()) {

            s.setMaxSize(20_000_000);

            s.onEvent(ParkStream.class.getName(), e -> {

                parkLatch.countDown();

                await(removalLatch);

            });

            s.onEvent(IFeelFine.class.getName(), e -> {

                IfeelFineLatch.countDown();

            });

            s.startAsync();

            emitData(15_000_000);

            ParkStream ps = new ParkStream();

            ps.commit();

            await(parkLatch);

            // Try to force removal of chunk that is being streamed

            emitData(50_000_000);

            removalLatch.countDown();

            IFeelFine i = new IFeelFine();

            i.commit();

            await(IfeelFineLatch);

        }

    }

    private static void await(CountDownLatch latch) throws Error {

        try {

            latch.await();

        } catch (InterruptedException e1) {

            throw new Error("Latch interupted");

        }

    }

    private static void emitData(int amount) throws InterruptedException {

        int count = 0;

        while (amount > 0) {

            DataEvent de = new DataEvent();

            // 5 doubles are 40 bytes bytes

            // and event size, event type, thread,

            // start time, duration and stack trace about 15 bytes

            de.double1 = 0.0;

            de.double2 = 1.0;

            de.double3 = 2.0;

            de.double4 = 3.0;

            de.double5 = 4.0;

            de.commit();

            amount -= 55;

            count++;

            //

            if (count % 100_000 == 0) {

                Thread.sleep(10);

            }

        }

    }

}