/*

 * Copyright (c) 2013, 2018, 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.

 *

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package jdk.jfr.event.runtime;

import static jdk.test.lib.Asserts.assertTrue;

import java.time.Duration;

import java.util.ArrayList;

import java.util.List;

import java.util.Random;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedEvent;

import jdk.test.lib.jfr.EventNames;

import jdk.test.lib.jfr.Events;

/*

 * @test

 * @key jfr

 * @library /test/lib

 * @run main/othervm jdk.jfr.event.runtime.TestJavaThreadStatisticsEvent

 */

public class TestJavaThreadStatisticsEvent {

    private static final String EVENT_NAME = EventNames.JavaThreadStatistics;

    private static final int THREAD_COUNT = 10;

    private static final Random RAND = new Random(4711);

    // verify thread count: 0 <= daemon <= active <= peak <= accumulated.

    public static void main(String[] args) throws Throwable {

        Recording recording = new Recording();

        recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(10));

        recording.start();

        List<Thread> threads = new ArrayList<>();

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

            Thread thread = new Thread(TestJavaThreadStatisticsEvent::sleepRandom);

            thread.start();

            threads.add(thread);

        }

        for (Thread thread : threads) {

            thread.join();

        }

        recording.stop();

        List<RecordedEvent> events = Events.fromRecording(recording);

        boolean isAnyFound = false;

        for (RecordedEvent event : events) {

            System.out.println("Event:" + event);

            isAnyFound = true;

            // verify thread count: 0 <= daemon <= active <= peak <= accumulated.

            long daemonCount = Events.assertField(event, "daemonCount").atLeast(0L).getValue();

            long activeCount = Events.assertField(event, "activeCount").atLeast(daemonCount).getValue();

            long peakCount = Events.assertField(event, "peakCount").atLeast(activeCount).atLeast(1L).getValue();

            Events.assertField(event, "accumulatedCount").atLeast(peakCount).getValue();

        }

        assertTrue(isAnyFound, "Correct event not found");

    }

    static void sleepRandom() {

        try {

            Thread.sleep(RAND.nextInt(10));

        } catch (InterruptedException e) {

            e.printStackTrace();

        }

    }

}