/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

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

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

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 Tests that a stream can gracefully handle chunk being removed

 * @key jfr

 * @requires vm.hasJFR

 * @library /test/lib

 * @run main/othervm -Xlog:jfr*=info jdk.jfr.api.consumer.streaming.TestRemovedChunks

 */

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(5_000_000);

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

                parkLatch.countDown();

                await(removalLatch);

            });

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

                IFeelFineLatch.countDown();

            });

            s.startAsync();

            // Fill first chunk with data

            emitData(1_000_000);

            // Park stream

            ParkStream ps = new ParkStream();

            ps.commit();

            await(parkLatch);

            // Rotate and emit data that exceeds maxSize

            for (int i = 0; i< 10;i++) {

                try (Recording r = new Recording()) {

                    r.start();

                    emitData(1_000_000);

                }

            }

            // Emit final event

            IFeelFine i = new IFeelFine();

            i.commit();

            // Wake up parked stream

            removalLatch.countDown();

            // Await event things gone bad

            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);

            }

        }

    }

}