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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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,
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package jdk.jfr.event.runtime;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Stream;

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;

/**
 * @test
 * @key jfr
 * @requires vm.hasJFR
 * @library /test/lib
 *
 * @run main/othervm -Xlog:jfr+event=trace jdk.jfr.event.runtime.TestNetworkUtilizationEvent
 */
public class TestNetworkUtilizationEvent {

    private static final long packetSendCount = 100;

    public static void main(String[] args) throws Throwable {
        Set<String> networkInterfaces = new HashSet<>();

        Recording recording = new Recording();
        recording.enable(EventNames.NetworkUtilization).with("period", "endChunk");
        recording.start();

        DatagramSocket socket = new DatagramSocket();
        String msg = "hello!";
        byte[] buf = msg.getBytes();
        forceEndChunk();
        // Send a few packets both to the loopback address as well to an external
        InetAddress iadr1 = InetAddress.getLoopbackAddress();
        System.out.println("InetAddress.getLoopbackAddress :" + iadr1 + " host address:" + iadr1.getHostAddress());

        DatagramPacket packet = new DatagramPacket(buf, buf.length, iadr1, 12345);
        for (int i = 0; i < packetSendCount; ++i) {
            socket.send(packet);
        }

        Stream<InetAddress> si = NetworkInterface.networkInterfaces().flatMap(NetworkInterface::inetAddresses);
        si.forEach(inetAddr->{
            System.out.println("Sending to InetAddress:" + inetAddr);
            try {
                java.util.concurrent.TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) { }
            try {
                final DatagramPacket packet2 = new DatagramPacket(buf, buf.length, inetAddr, 12345);
                for (int i = 0; i < packetSendCount; ++i) {
                    socket.send(packet2);
                }
            } catch(IOException ioe) {
            }
        });

        forceEndChunk();
        socket.close();
        // Now there should have been traffic on at least two different interfaces
        recording.stop();

        List<RecordedEvent> events = Events.fromRecording(recording);
        Events.hasEvents(events);
        for (RecordedEvent event : events) {
            System.out.println(event);
            Events.assertField(event, "writeRate").atLeast(0L).atMost(1000L * Integer.MAX_VALUE);
            Events.assertField(event, "readRate").atLeast(0L).atMost(1000L * Integer.MAX_VALUE);
            Events.assertField(event, "networkInterface").notNull();
            if (event.getLong("writeRate") > 0) {
                networkInterfaces.add(event.getString("networkInterface"));
            }
        }

        System.out.println("number of network interfaces with positive writeRate found is " + networkInterfaces.size());

        if (Platform.isWindows() || Platform.isSolaris()) {
            // Windows and Solaris do not track statistics for the loopback interface
            Asserts.assertGreaterThanOrEqual(networkInterfaces.size(), 1, "Not enough network interfaces found");
        } else {
            Asserts.assertGreaterThanOrEqual(networkInterfaces.size(), 2, "Not enough network interfaces found");
        }
    }

    private static void forceEndChunk() {
       try(Recording r = new Recording()) {
           r.start();
           r.stop();
       }
    }
}