Added SystemInfo record that gathers a variety of interesting system
statistics and provides a facility for updating the statistics and obtaining a concise human-readable string presentation. git-svn-id: https://samskivert.googlecode.com/svn/trunk@1010 6335cc39-0255-0410-8fd6-9bcaacd3b74c
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shaper
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//
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// $Id: SystemInfo.java,v 1.1 2003/01/14 22:07:05 shaper Exp $
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//
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// samskivert library - useful routines for java programs
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// Copyright (C) 2003 Walter Korman
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.samskivert.util;
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import java.awt.DisplayMode;
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import java.awt.GraphicsDevice;
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import java.awt.GraphicsEnvironment;
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/**
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* A record detailing that gathers and makes available various useful bits
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* of system information. The record is populated with the current system
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* statistics at construction time, and may be refreshed as desired with a
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* call to {@link #update}.
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*/
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public class SystemInfo
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{
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/** The operating system name. */
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public String osName;
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/** The operating system version. */
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public String osVersion;
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/** The operating system architecture. */
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public String osArch;
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/** The JVM version. */
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public String javaVersion;
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/** The JVM vendor. */
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public String javaVendor;
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/** The amount of free memory in kilobytes. */
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public long freeMemory;
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/** The amount of used memory in kilobytes. */
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public long usedMemory;
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/** The amount of total memory available in kilobytes. */
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public long totalMemory;
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/** The maximum amount of memory available in kilobytes. */
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public long maxMemory;
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/** The video display bit depth; see {@link DisplayMode}. */
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public int bitDepth;
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/** The video display refresh rate in kHz; see {@link DisplayMode}. */
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public int refreshRate;
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/** Whether the video display is currently set to full-screen mode. */
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public boolean isFullScreen;
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/** The video display width in pixels. */
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public int displayWidth;
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/** The video display height in pixels. */
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public int displayHeight;
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/**
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* Constructs a system info object.
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*/
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public SystemInfo ()
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{
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// gather initial system info
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update();
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}
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/**
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* Updates the system info record's statistics to reflect the current
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* state of the JVM.
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*/
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public void update ()
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{
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// grab the various system properties
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osName = System.getProperty("os.name");
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osVersion = System.getProperty("os.version");
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osArch = System.getProperty("os.arch");
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javaVersion = System.getProperty("java.version");
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javaVendor = System.getProperty("java.vendor");
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// determine memory usage
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Runtime rtime = Runtime.getRuntime();
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freeMemory = rtime.freeMemory() / 1024;
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totalMemory = rtime.totalMemory() / 1024;
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usedMemory = totalMemory - freeMemory;
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maxMemory = rtime.maxMemory() / 1024;
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// determine video display information
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GraphicsEnvironment env =
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GraphicsEnvironment.getLocalGraphicsEnvironment();
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GraphicsDevice gd = env.getDefaultScreenDevice();
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DisplayMode mode = gd.getDisplayMode();
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bitDepth = mode.getBitDepth();
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refreshRate = mode.getRefreshRate() / 1024;
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isFullScreen = (gd.getFullScreenWindow() != null);
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displayWidth = mode.getWidth();
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displayHeight = mode.getHeight();
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}
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/**
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* Returns a string representation of this instance.
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*/
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public String toString ()
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{
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StringBuffer buf = new StringBuffer();
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// hardware and platform information
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buf.append("OS: ").append(osName).append(" (").
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append(osVersion).append("-").append(osArch).append(")\n");
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buf.append("JVM: ").append(javaVersion).
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append(", ").append(javaVendor).append("\n");
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// memory information
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buf.append("Memory: ").append(freeMemory).append("k free, ").
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append(usedMemory).append("k used, ").
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append(totalMemory).append("k total, ").
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append(maxMemory).append("k max\n");
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// video information
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String sbitDepth = (bitDepth == -1) ? "unknown bit depth" :
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bitDepth + "-bit";
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String srefreshRate =
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(refreshRate == DisplayMode.REFRESH_RATE_UNKNOWN) ?
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"unknown refresh rate" : (refreshRate + "kHz");
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String sfullScreen = (isFullScreen) ? "full-screen" : "windowed";
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buf.append("Display: ").append(displayWidth).append("x").
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append(displayHeight).append(", ").append(sbitDepth).
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append(", ").append(srefreshRate).append(", ").append(sfullScreen);
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return buf.toString();
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}
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}
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@@ -0,0 +1,43 @@
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//
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// $Id: SystemInfoDemo.java,v 1.1 2003/01/14 22:07:06 shaper Exp $
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//
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// samskivert library - useful routines for java programs
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// Copyright (C) 2003 Walter Korman
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.samskivert.util;
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public class SystemInfoDemo
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{
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public static void main (String[] args)
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{
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// output initial system information
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SystemInfo info = new SystemInfo();
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System.out.println("Initial system info:");
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System.out.println(info.toString());
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// allocate a bit of data
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System.out.println("\nAllocating test data.");
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for (int ii = 0; ii < 10000; ii++) {
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int[] data = new int[100];
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}
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// update and output the latest system information
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info.update();
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System.out.println("\nUpdated system info:");
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System.out.println(info.toString());
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}
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}
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