1 /*

     2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

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

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.jfr.event.runtime;

    27 

    28 import jdk.jfr.Recording;

    29 import jdk.jfr.consumer.RecordedEvent;

    30 import jdk.test.lib.Asserts;

    31 import jdk.test.lib.Platform;

    32 import jdk.test.lib.jfr.EventNames;

    33 import jdk.test.lib.jfr.Events;

    34 

    35 import java.net.DatagramPacket;

    36 import java.net.DatagramSocket;

    37 import java.net.InetAddress;

    38 import java.time.Duration;

    39 import java.time.Instant;

    40 import java.util.List;

    41 import java.util.Map;

    42 

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

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

    45 

    46 /*

    47  * @test

    48  * @key jfr

    49  * @library /test/lib

    50  *

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

    52  */

    53 public class TestNetworkUtilizationEvent {

    54 

    55     private static final long packetSendCount = 100;

    56 

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

    58         testSimple();

    59     }

    60 

    61     static void testSimple() throws Throwable {

    62 

    63         Instant start = Instant.now();

    64         Recording recording = new Recording();

    65         recording.enable(EventNames.NetworkUtilization);

    66         recording.start();

    67 

    68         DatagramSocket socket = new DatagramSocket();

    69         String msg = "hello!";

    70         byte[] buf = msg.getBytes();

    71 

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

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

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

    75             socket.send(packet);

    76         }

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

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

    79             socket.send(packet);

    80         }

    81 

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

    83         recording.stop();

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

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

    86 

    87         // Calculate the average write rate for each interface

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

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

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

    91 

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

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

    94 

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

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

    97                 .filter(d -> d >= expectedTraffic)

    98                 .count();

    99 

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

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

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

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

   104         } else {

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

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

   107         }

   108     }

   109 }