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

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 * 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.recordingstream;

import java.util.concurrent.CountDownLatch;

import jdk.jfr.Event;

import jdk.jfr.consumer.RecordingStream;

/**

 * @test

 * @summary Tests RecordingStream::onFlush(...)

 * @key jfr

 * @requires vm.hasJFR

 * @library /test/lib

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

 */

public class TestOnFlush {

    static class OneEvent extends Event {

    }

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

        testOnFlushNull();

        testOneEvent();

        testNoEvent();

    }

    private static void testOnFlushNull() {

        try (RecordingStream rs = new RecordingStream()) {

           try {

               rs.onFlush(null);

               throw new AssertionError("Expected NullPointerException from onFlush(null");

           } catch (NullPointerException npe) {

               // OK; as expected

           }

        }

     }

    private static void testNoEvent() throws Exception {

        CountDownLatch flush = new CountDownLatch(1);

        try (RecordingStream r = new RecordingStream()) {

            r.onFlush(() -> {

                flush.countDown();

            });

            r.startAsync();

            flush.await();

        }

    }

    private static void testOneEvent() throws InterruptedException {

        CountDownLatch flush = new CountDownLatch(1);

        try (RecordingStream r = new RecordingStream()) {

            r.onEvent(e -> {

                // ignore event

            });

            r.onFlush(() -> {

                flush.countDown();

            });

            r.startAsync();

            OneEvent e = new OneEvent();

            e.commit();

            flush.await();

        }

    }

}