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Java > Open Source Codes > com > jcorporate > expresso > core > utility > SystemInfo


1 /* ====================================================================
2  * The Jcorporate Apache Style Software License, Version 1.2 05-07-2002
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59  * <http://www.jcorporate.com/>.
60  *
61  * Portions of this software are based upon other open source
62  * products and are subject to their respective licenses.
63  */
64
65 package com.jcorporate.expresso.core.utility;
66
67 import java.net.InetAddress JavaDoc;
68 import java.net.UnknownHostException JavaDoc;
69
70
71 /**
72  * System information utility class
73  */
74 public class SystemInfo {
75     public SystemInfo() {
76     }
77
78     /**
79      * Retrieve the total system memory in kilobytes
80      *
81      * @return integer
82      */
83     public static int getTotalMem() {
84         int totalMemory = (int) m_runtime.totalMemory() / 1024;
85
86         return totalMemory;
87     }
88
89     /**
90      * Get the used memory in bytes
91      *
92      * @return integer
93      */
94     public static int getUsedMem() {
95         int totalMem = getTotalMem();
96         int freeMem = getFreeMem();
97         int memUsage = (totalMem - freeMem);
98
99         return memUsage;
100     }
101
102     /**
103      * Retrieve the amount of free memory in Kilobytes
104      *
105      * @return integer
106      */
107     public static int getFreeMem() {
108         int freeMemory = (int) m_runtime.freeMemory() / 1024;
109
110         return freeMemory;
111     }
112
113     /**
114      * Not implemented
115      *
116      * @return
117      */
118     public static int getLoadAverage() {
119         return 1;
120     }
121
122     public static double getPowerFactor() {
123         double powerFactor = 1;
124
125         return powerFactor;
126     }
127
128     /**
129      * Get the host name. Returns unknown if it cannot ascertain the localhost
130      * host name
131      *
132      * @return java.lang.String
133      */
134     public static String JavaDoc getHostName() {
135         String JavaDoc hostName = "unknown";
136
137         try {
138             InetAddress JavaDoc netAddress = InetAddress.getLocalHost();
139             hostName = netAddress.getHostName();
140             if (hostName == null) {
141                 hostName = "unknown";
142             }
143         } catch (UnknownHostException JavaDoc e) {
144             System.err.println("Cannot get host name");
145         }
146
147         return hostName;
148     }
149
150     /**
151      * Returns the operating system name as defined by the &quot;os.name&quot;
152      * system property
153      *
154      * @return java.lang.String
155      */
156     public static String JavaDoc getOSName() {
157         return System.getProperty("os.name");
158     }
159
160     /**
161      * Retrieves either windows or unix depending on the os name
162      *
163      * @return java.lang.String either MSWIN or Unix
164      */
165     public static String JavaDoc getOSClass() {
166         String JavaDoc osName = getOSName();
167         String JavaDoc ret = null;
168
169         if (osName.startsWith("Windows")) {
170             ret = "MSWIN";
171         } else {
172             ret = "Unix";
173         }
174
175         return ret;
176     }
177
178     /**
179      * The Runtime system
180      */
181     private static Runtime JavaDoc m_runtime = Runtime.getRuntime();
182 }
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