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

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 * 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

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package jdk.jfr.api.consumer.recordingstream;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.atomic.AtomicBoolean;

import jdk.jfr.Event;

import jdk.jfr.consumer.RecordingStream;

/**

 * @test

 * @summary Tests RecordingStream::start()

 * @key jfr

 * @requires vm.hasJFR

 * @run main/othervm jdk.jfr.api.consumer.recordingstream.TestStart

 */

public class TestStart {

    static class StartEvent extends Event {

    }

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

        testStart();

        testStartOnEvent();

        testStartTwice();

        testStartClosed();

    }

    private static void testStartTwice() throws Exception {

        log("Entering testStartTwice()");

        CountDownLatch started = new CountDownLatch(1);

        try (RecordingStream rs = new RecordingStream()) {

            EventProducer t = new EventProducer();

            t.start();

            rs.onEvent(e -> {

                if (started.getCount() > 0) {

                    started.countDown();

                }

            });

            started.await();

            t.kill();

            try {

                rs.start();

                throw new AssertionError("Expected IllegalStateException if started twice");

            } catch (IllegalStateException ise) {

                // OK, as expected

            }

        }

        log("Leaving testStartTwice()");

    }

    static void testStart() throws Exception {

        log("Entering testStart()");

        CountDownLatch started = new CountDownLatch(1);

        try (RecordingStream rs = new RecordingStream()) {

            rs.onEvent(e -> {

                started.countDown();

            });

            EventProducer t = new EventProducer();

            t.start();

            started.await();

            t.kill();

        }

        log("Leaving testStart()");

    }

    static void testStartOnEvent() throws Exception {

        log("Entering testStartOnEvent()");

        AtomicBoolean ISE = new AtomicBoolean(false);

        CountDownLatch startedTwice = new CountDownLatch(1);

        try (RecordingStream rs = new RecordingStream()) {

            rs.onEvent(e -> {

                try {

                    rs.start(); // must not deadlock

                } catch (IllegalStateException ise) {

                    if (!ISE.get())  {

                        ISE.set(true);

                        startedTwice.countDown();

                    }

                }

            });

            EventProducer t = new EventProducer();

            t.start();

            startedTwice.await();

            t.kill();

            if (!ISE.get()) {

                throw new AssertionError("Expected IllegalStateException");

            }

        }

        log("Leaving testStartOnEvent()");

    }

    static void testStartClosed() {

        log("Entering testStartClosed()");

        RecordingStream rs = new RecordingStream();

        rs.close();

        try {

            rs.start();

            throw new AssertionError("Expected IllegalStateException");

        } catch (IllegalStateException ise) {

            // OK, as expected.

        }

        log("Leaving testStartClosed()");

    }

    private static void log(String msg) {

        System.out.println(msg);

    }

}