rev 12972 : 8140606: Update library code to use internal Unsafe
Reviewed-by: duke

   1 /*
   2  * Copyright (c) 2003, 2013, 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 sun.management;
  27 
  28 import java.lang.management.OperatingSystemMXBean;
  29 import java.lang.management.ManagementFactory;
  30 import javax.management.ObjectName;
  31 import sun.misc.Unsafe;
  32 
  33 /**
  34  * Implementation class for the operating system.
  35  * Standard and committed hotspot-specific metrics if any.
  36  *
  37  * ManagementFactory.getOperatingSystemMXBean() returns an instance
  38  * of this class.
  39  */
  40 public class BaseOperatingSystemImpl implements OperatingSystemMXBean {
  41 
  42     private final VMManagement jvm;
  43 
  44     /**
  45      * Constructor of BaseOperatingSystemImpl class.
  46      */
  47     protected BaseOperatingSystemImpl(VMManagement vm) {
  48         this.jvm = vm;
  49     }
  50 
  51     public String getName() {
  52         return jvm.getOsName();
  53     }
  54 
  55     public String getArch() {
  56         return jvm.getOsArch();
  57     }
  58 
  59     public String getVersion() {
  60         return jvm.getOsVersion();
  61     }
  62 
  63     public int getAvailableProcessors() {
  64         return jvm.getAvailableProcessors();
  65     }
  66 
  67     private static final Unsafe unsafe = Unsafe.getUnsafe();
  68     private double[] loadavg = new double[1];
  69     public double getSystemLoadAverage() {
  70         if (unsafe.getLoadAverage(loadavg, 1) == 1) {
  71              return loadavg[0];
  72         } else {
  73              return -1.0;
  74         }
  75     }
  76     public ObjectName getObjectName() {
  77         return Util.newObjectName(ManagementFactory.OPERATING_SYSTEM_MXBEAN_NAME);
  78     }
  79 
  80 }
--- EOF ---