/*

 * 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.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);

                    }

                }

            }

        }

    }

}