J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005 Sun Microsystems, Inc. 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. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * |
| 26 | * |
| 27 | * @bug 6336608 6511738 |
| 28 | * @summary Basic unit test of OperatingSystemMXBean.getSystemLoadAverage() |
| 29 | * @author Mandy Chung |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * This test tests the load average on linux and solaris. On Windows, |
| 34 | * getSystemLoadAverage() returns -1. |
| 35 | * |
| 36 | * Usage: GetSystemLoadAverage ["-1.0"] |
| 37 | * Arguments: |
| 38 | * o If no argument is specified, the test will verify the system load |
| 39 | * average with the /usr/bin/uptime command. |
| 40 | * o Otherwise, the input argument must be "-1.0" indicating the |
| 41 | * expected system load average. This would only be the case when |
| 42 | * running on Windows. |
| 43 | */ |
| 44 | |
| 45 | import java.lang.management.*; |
| 46 | import java.io.*; |
| 47 | |
| 48 | public class GetSystemLoadAverage { |
| 49 | |
| 50 | private static OperatingSystemMXBean mbean = |
| 51 | ManagementFactory.getOperatingSystemMXBean(); |
| 52 | |
| 53 | // The system load average may be changing due to other jobs running. |
| 54 | // Allow some delta. |
| 55 | private static double DELTA = 0.05; |
| 56 | |
| 57 | public static void main(String args[]) throws Exception { |
| 58 | if (args.length > 1) { |
| 59 | throw new IllegalArgumentException("Unexpected number of args " + args.length); |
| 60 | } |
| 61 | |
| 62 | if (args.length == 0) { |
| 63 | // On Linux or Solaris |
| 64 | checkLoadAvg(); |
| 65 | } else { |
| 66 | // On Windows, the system load average is expected to be -1.0 |
| 67 | if (!args[0].equals("-1.0")) { |
| 68 | throw new IllegalArgumentException("Invalid argument: " + args[0]); |
| 69 | } else { |
| 70 | double loadavg = mbean.getSystemLoadAverage(); |
| 71 | if (loadavg != -1.0) { |
| 72 | throw new RuntimeException("Expected load average : -1.0" + |
| 73 | " but getSystemLoadAverage returned: " + |
| 74 | loadavg); |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | System.out.println("Test passed."); |
| 80 | } |
| 81 | |
| 82 | private static String LOAD_AVERAGE_TEXT = "load average:"; |
| 83 | private static void checkLoadAvg() throws Exception { |
| 84 | // Obtain load average from OS command |
| 85 | ProcessBuilder pb = new ProcessBuilder("/usr/bin/uptime"); |
| 86 | Process p = pb.start(); |
| 87 | String output = commandOutput(p); |
| 88 | |
| 89 | // obtain load average from OperatingSystemMXBean |
| 90 | double loadavg = mbean.getSystemLoadAverage(); |
| 91 | |
| 92 | // verify if two values are close |
| 93 | output = output.substring(output.lastIndexOf(LOAD_AVERAGE_TEXT) + |
| 94 | LOAD_AVERAGE_TEXT.length()); |
| 95 | System.out.println("Load average returned from uptime = " + output); |
| 96 | System.out.println("getSystemLoadAverage() returned " + loadavg); |
| 97 | |
| 98 | String[] lavg = output.split(","); |
| 99 | double expected = Double.parseDouble(lavg[0]); |
| 100 | double lowRange = expected * (1 - DELTA); |
| 101 | double highRange = expected * (1 + DELTA); |
| 102 | |
| 103 | if (loadavg < lowRange || loadavg > highRange) { |
| 104 | throw new RuntimeException("Expected load average : " + |
| 105 | expected + |
| 106 | " but getSystemLoadAverage returned: " + |
| 107 | loadavg); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | private static String commandOutput(Reader r) throws Exception { |
| 112 | StringBuilder sb = new StringBuilder(); |
| 113 | int c; |
| 114 | while ((c = r.read()) > 0) { |
| 115 | if (c != '\r') { |
| 116 | sb.append((char) c); |
| 117 | } |
| 118 | } |
| 119 | return sb.toString(); |
| 120 | } |
| 121 | |
| 122 | private static String commandOutput(Process p) throws Exception { |
| 123 | Reader r = new InputStreamReader(p.getInputStream(),"UTF-8"); |
| 124 | String output = commandOutput(r); |
| 125 | p.waitFor(); |
| 126 | p.exitValue(); |
| 127 | return output; |
| 128 | } |
| 129 | |
| 130 | } |