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  * @requires vm.hasJFR
  50  * @library /test/lib
  51  *
  52  * @run main/othervm jdk.jfr.event.runtime.TestNetworkUtilizationEvent
  53  */
  54 public class TestNetworkUtilizationEvent {
  55 
  56     private static final long packetSendCount = 100;
  57 
  58     public static void main(String[] args) throws Throwable {
  59         testSimple();
  60     }
  61 
  62     static void testSimple() throws Throwable {
  63 
  64         Instant start = Instant.now();
  65         Recording recording = new Recording();
  66         recording.enable(EventNames.NetworkUtilization);
  67         recording.start();
  68 
  69         DatagramSocket socket = new DatagramSocket();
  70         String msg = "hello!";
  71         byte[] buf = msg.getBytes();
  72 
  73         // Send a few packets both to the loopback address as well to an external
  74         DatagramPacket packet = new DatagramPacket(buf, buf.length, InetAddress.getLoopbackAddress(), 12345);
  75         for (int i = 0; i < packetSendCount; ++i) {
  76             socket.send(packet);
  77         }
  78         packet = new DatagramPacket(buf, buf.length, InetAddress.getByName("10.0.0.0"), 12345);
  79         for (int i = 0; i < packetSendCount; ++i) {
  80             socket.send(packet);
  81         }
  82 
  83         // Now there should have been traffic on at least two different interfaces
  84         recording.stop();
  85         Duration runtime = Duration.between(start, Instant.now());
  86         List<RecordedEvent> events = Events.fromRecording(recording);
  87 
  88         // Calculate the average write rate for each interface
  89         Map<String, Double> writeRates = events.stream()
  90                 .collect(groupingBy(e -> Events.assertField(e, "networkInterface").getValue(),
  91                          averagingLong(e -> Events.assertField(e, "writeRate").getValue())));
  92 
  93         // Our test packets should have generated at least this much traffic per second
  94         long expectedTraffic = (buf.length * packetSendCount) / Math.max(1, runtime.toSeconds());
  95 
  96         // Count the number of interfaces that have seen at least our test traffic
  97         long interfacesWithTraffic = writeRates.values().stream()
  98                 .filter(d -> d >= expectedTraffic)
  99                 .count();
 100 
 101         if (Platform.isWindows() || Platform.isSolaris()) {
 102             // Windows and Solaris do not track statistics for the loopback interface
 103             Asserts.assertGreaterThanOrEqual(writeRates.size(), 1);
 104             Asserts.assertGreaterThanOrEqual(interfacesWithTraffic, Long.valueOf(1));
 105         } else {
 106             Asserts.assertGreaterThanOrEqual(writeRates.size(), 2);
 107             Asserts.assertGreaterThanOrEqual(interfacesWithTraffic, Long.valueOf(2));
 108         }
 109     }
 110 }