| /* |
| * Copyright (c) 2005, 2012, 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. |
| * |
| * 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. |
| */ |
| |
| /* |
| * |
| * |
| * @bug 6336608 6511738 |
| * @summary Basic unit test of OperatingSystemMXBean.getSystemLoadAverage() |
| * @author Mandy Chung |
| */ |
| |
| /* |
| * This test tests the load average on linux and solaris. On Windows, |
| * getSystemLoadAverage() returns -1. |
| * |
| * Usage: GetSystemLoadAverage ["-1.0"] |
| * Arguments: |
| * o If no argument is specified, the test will verify the system load |
| * average with the /usr/bin/uptime command. |
| * o Otherwise, the input argument must be "-1.0" indicating the |
| * expected system load average. This would only be the case when |
| * running on Windows. |
| */ |
| |
| import java.lang.management.*; |
| import java.io.*; |
| |
| public class GetSystemLoadAverage { |
| |
| private static OperatingSystemMXBean mbean = |
| ManagementFactory.getOperatingSystemMXBean(); |
| |
| // The system load average may be changing due to other jobs running. |
| // Allow some delta. |
| private static double DELTA = 0.05; |
| |
| public static void main(String args[]) throws Exception { |
| if (args.length > 1) { |
| throw new IllegalArgumentException("Unexpected number of args " + args.length); |
| } |
| |
| if (args.length == 0) { |
| // On Linux or Solaris |
| checkLoadAvg(); |
| } else { |
| // On Windows, the system load average is expected to be -1.0 |
| if (!args[0].equals("-1.0")) { |
| throw new IllegalArgumentException("Invalid argument: " + args[0]); |
| } else { |
| double loadavg = mbean.getSystemLoadAverage(); |
| if (loadavg != -1.0) { |
| throw new RuntimeException("Expected load average : -1.0" + |
| " but getSystemLoadAverage returned: " + |
| loadavg); |
| } |
| } |
| } |
| |
| System.out.println("Test passed."); |
| } |
| |
| private static String LOAD_AVERAGE_TEXT |
| = System.getProperty("os.name").contains("OS X") |
| ? "load averages:" |
| : "load average:"; |
| |
| private static void checkLoadAvg() throws Exception { |
| // Obtain load average from OS command |
| ProcessBuilder pb = new ProcessBuilder("/usr/bin/uptime"); |
| Process p = pb.start(); |
| String output = commandOutput(p); |
| |
| // obtain load average from OperatingSystemMXBean |
| double loadavg = mbean.getSystemLoadAverage(); |
| |
| // verify if two values are close |
| output = output.substring(output.lastIndexOf(LOAD_AVERAGE_TEXT) + |
| LOAD_AVERAGE_TEXT.length() + 1); |
| System.out.println("Load average returned from uptime = " + output); |
| System.out.println("getSystemLoadAverage() returned " + loadavg); |
| |
| String[] lavg = System.getProperty("os.name").contains("OS X") |
| ? output.split(" ") |
| : output.split(","); |
| double expected = Double.parseDouble(lavg[0]); |
| double lowRange = expected * (1 - DELTA); |
| double highRange = expected * (1 + DELTA); |
| |
| if (loadavg < lowRange || loadavg > highRange) { |
| throw new RuntimeException("Expected load average : " + |
| expected + |
| " but getSystemLoadAverage returned: " + |
| loadavg); |
| } |
| } |
| |
| private static String commandOutput(Reader r) throws Exception { |
| StringBuilder sb = new StringBuilder(); |
| int c; |
| while ((c = r.read()) > 0) { |
| if (c != '\r') { |
| sb.append((char) c); |
| } |
| } |
| return sb.toString(); |
| } |
| |
| private static String commandOutput(Process p) throws Exception { |
| Reader r = new InputStreamReader(p.getInputStream(),"UTF-8"); |
| String output = commandOutput(r); |
| p.waitFor(); |
| p.exitValue(); |
| return output; |
| } |
| |
| } |