/*

 * Copyright (c) 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.

 *

 * 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.event.runtime;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedEvent;

import jdk.test.lib.Asserts;

import jdk.test.lib.Platform;

import jdk.test.lib.jfr.EventNames;

import jdk.test.lib.jfr.Events;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import java.time.Duration;

import java.time.Instant;

import java.util.List;

import java.util.Map;

import static java.util.stream.Collectors.averagingLong;

import static java.util.stream.Collectors.groupingBy;

/*

 * @test

 * @key jfr

 * @library /test/lib

 *

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

 */

public class TestNetworkUtilizationEvent {

    private static final long packetSendCount = 100;

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

        testSimple();

    }

    static void testSimple() throws Throwable {

        Instant start = Instant.now();

        Recording recording = new Recording();

        recording.enable(EventNames.NetworkUtilization);

        recording.start();

        DatagramSocket socket = new DatagramSocket();

        String msg = "hello!";

        byte[] buf = msg.getBytes();

        // Send a few packets both to the loopback address as well to an external

        DatagramPacket packet = new DatagramPacket(buf, buf.length, InetAddress.getLoopbackAddress(), 12345);

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

            socket.send(packet);

        }

        packet = new DatagramPacket(buf, buf.length, InetAddress.getByName("10.0.0.0"), 12345);

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

            socket.send(packet);

        }

        // Now there should have been traffic on at least two different interfaces

        recording.stop();

        Duration runtime = Duration.between(start, Instant.now());

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

        // Calculate the average write rate for each interface

        Map<String, Double> writeRates = events.stream()

                .collect(groupingBy(e -> Events.assertField(e, "networkInterface").getValue(),

                         averagingLong(e -> Events.assertField(e, "writeRate").getValue())));

        // Our test packets should have generated at least this much traffic per second

        long expectedTraffic = (buf.length * packetSendCount) / Math.max(1, runtime.toSeconds());

        // Count the number of interfaces that have seen at least our test traffic

        long interfacesWithTraffic = writeRates.values().stream()

                .filter(d -> d >= expectedTraffic)

                .count();

        if (Platform.isWindows() || Platform.isSolaris()) {

            // Windows and Solaris do not track statistics for the loopback interface

            Asserts.assertGreaterThanOrEqual(writeRates.size(), 1);

            Asserts.assertGreaterThanOrEqual(interfacesWithTraffic, Long.valueOf(1));

        } else {

            Asserts.assertGreaterThanOrEqual(writeRates.size(), 2);

            Asserts.assertGreaterThanOrEqual(interfacesWithTraffic, Long.valueOf(2));

        }

    }

}