1 /*
   2  * Copyright (c) 2011, 2015, 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.
   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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug     7028071
  27  * @summary Basic unit test of OperatingSystemMXBean.getProcessCpuLoad()
  28  *
  29  * @modules jdk.management
  30  * @run main GetProcessCpuLoad
  31  */
  32 
  33 import java.lang.management.*;
  34 import com.sun.management.OperatingSystemMXBean;
  35 
  36 public class GetProcessCpuLoad {
  37     public static void main(String[] argv) throws Exception {
  38         OperatingSystemMXBean mbean = (com.sun.management.OperatingSystemMXBean)
  39             ManagementFactory.getOperatingSystemMXBean();
  40         double load;
  41         for(int i=0; i<10; i++) {
  42             load = mbean.getProcessCpuLoad();
  43             if((load<0.0 || load>1.0) && load != -1.0) {
  44                 throw new RuntimeException("getProcessCpuLoad() returns " + load
  45                        +   " which is not in the [0.0,1.0] interval");
  46             }
  47             try {
  48                 Thread.sleep(200);
  49             } catch(InterruptedException e) {
  50                 e.printStackTrace();
  51             }
  52         }
  53     }
  54 }