1 /*
   2  * Copyright (c) 2003, 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.  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 com.sun.management.internal;
  27 
  28 import com.sun.management.OperatingSystemMXBean;
  29 import sun.management.BaseOperatingSystemImpl;
  30 import sun.management.VMManagement;
  31 
  32 /**
  33  * Implementation class for the operating system.
  34  * Standard and committed hotspot-specific metrics if any.
  35  *
  36  * ManagementFactory.getOperatingSystemMXBean() returns an instance
  37  * of this class.
  38  */
  39 class OperatingSystemImpl extends BaseOperatingSystemImpl
  40     implements OperatingSystemMXBean {
  41 
  42     // psapiLock is a lock to make sure only one thread loading
  43     // PSAPI DLL.
  44     private static Object psapiLock = new Object();
  45 
  46     OperatingSystemImpl(VMManagement vm) {
  47         super(vm);
  48     }
  49 
  50     @Override
  51     public long getCommittedVirtualMemorySize() {
  52         synchronized (psapiLock) {
  53             return getCommittedVirtualMemorySize0();
  54         }
  55     }
  56 
  57     @Override
  58     public long getTotalSwapSpaceSize() {
  59         return getTotalSwapSpaceSize0();
  60     }
  61 
  62     @Override
  63     public long getFreeSwapSpaceSize() {
  64         return getFreeSwapSpaceSize0();
  65     }
  66 
  67     @Override
  68     public long getProcessCpuTime() {
  69         return getProcessCpuTime0();
  70     }
  71 
  72     @Override
  73     public long getFreePhysicalMemorySize() {
  74         return getFreePhysicalMemorySize0();
  75     }
  76 
  77     @Override
  78     public long getTotalPhysicalMemorySize() {
  79         return getTotalPhysicalMemorySize0();
  80     }
  81 
  82     @Override
  83     public double getSystemCpuLoad() {
  84         return getSystemCpuLoad0();
  85     }
  86 
  87     @Override
  88     public double getProcessCpuLoad() {
  89         return getProcessCpuLoad0();
  90     }
  91 
  92     /* native methods */
  93     private native long getCommittedVirtualMemorySize0();
  94     private native long getFreePhysicalMemorySize0();
  95     private native long getFreeSwapSpaceSize0();
  96     private native double getProcessCpuLoad0();
  97     private native long getProcessCpuTime0();
  98     private native double getSystemCpuLoad0();
  99     private native long getTotalPhysicalMemorySize0();
 100     private native long getTotalSwapSpaceSize0();
 101 
 102     static {
 103         initialize0();
 104     }
 105 
 106     private static native void initialize0();
 107 }