1 /*

     2  * Copyright (c) 2011, 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  * @run main GetSystemCpuLoad

    30  */

    31 

    32 import java.lang.management.*;

    33 import com.sun.management.OperatingSystemMXBean;

    34 

    35 public class GetSystemCpuLoad {

    36     public static void main(String[] argv) throws Exception {

    37         OperatingSystemMXBean mbean = (com.sun.management.OperatingSystemMXBean)

    38             ManagementFactory.getOperatingSystemMXBean();

    39         double load;

    40         for(int i=0; i<10; i++) {

    41             load = mbean.getSystemCpuLoad();

    42             if((load<0.0 || load>1.0) && load != -1.0) {

    43                 throw new RuntimeException("getSystemCpuLoad() returns " + load

    44                        +  " which is not in the [0.0,1.0] interval");

    45             }

    46             try {

    47                 Thread.sleep(200);

    48             } catch(InterruptedException e) {

    49                 e.printStackTrace();

    50             }

    51         }

    52     }

    53 }