/*

 * 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.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();

        }

    }

}