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

projects/samskivert/src/java/com/samskivert/util/SystemInfo.java

@@ -0,0 +1,150 @@
+//
+// $Id: SystemInfo.java,v 1.1 2003/01/14 22:07:05 shaper Exp $
+//
+// samskivert library - useful routines for java programs
+// Copyright (C) 2003 Walter Korman
+// 
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.samskivert.util;
+
+import java.awt.DisplayMode;
+import java.awt.GraphicsDevice;
+import java.awt.GraphicsEnvironment;
+
+/**
+ * A record detailing that gathers and makes available various useful bits
+ * of system information.  The record is populated with the current system
+ * statistics at construction time, and may be refreshed as desired with a
+ * call to {@link #update}.
+ */
+public class SystemInfo
+{
+    /** The operating system name. */
+    public String osName;
+
+    /** The operating system version. */
+    public String osVersion;
+
+    /** The operating system architecture. */
+    public String osArch;
+
+    /** The JVM version. */
+    public String javaVersion;
+
+    /** The JVM vendor. */
+    public String javaVendor;
+
+    /** The amount of free memory in kilobytes. */
+    public long freeMemory;
+
+    /** The amount of used memory in kilobytes. */
+    public long usedMemory;
+
+    /** The amount of total memory available in kilobytes. */
+    public long totalMemory;
+
+    /** The maximum amount of memory available in kilobytes. */
+    public long maxMemory;
+
+    /** The video display bit depth; see {@link DisplayMode}. */
+    public int bitDepth;
+
+    /** The video display refresh rate in kHz; see {@link DisplayMode}. */
+    public int refreshRate;
+
+    /** Whether the video display is currently set to full-screen mode. */
+    public boolean isFullScreen;
+
+    /** The video display width in pixels. */
+    public int displayWidth;
+
+    /** The video display height in pixels. */
+    public int displayHeight;
+
+    /**
+     * Constructs a system info object.
+     */
+    public SystemInfo ()
+    {
+        // gather initial system info
+        update();
+    }
+
+    /**
+     * Updates the system info record's statistics to reflect the current
+     * state of the JVM.
+     */
+    public void update ()
+    {
+        // grab the various system properties
+        osName = System.getProperty("os.name");
+        osVersion = System.getProperty("os.version");
+        osArch = System.getProperty("os.arch");
+        javaVersion = System.getProperty("java.version");
+        javaVendor = System.getProperty("java.vendor");
+
+        // determine memory usage
+        Runtime rtime = Runtime.getRuntime();
+        freeMemory = rtime.freeMemory() / 1024;
+        totalMemory = rtime.totalMemory() / 1024;
+        usedMemory = totalMemory - freeMemory;
+        maxMemory = rtime.maxMemory() / 1024;
+
+        // determine video display information
+        GraphicsEnvironment env =
+            GraphicsEnvironment.getLocalGraphicsEnvironment();
+        GraphicsDevice gd = env.getDefaultScreenDevice();
+        DisplayMode mode = gd.getDisplayMode();
+        bitDepth = mode.getBitDepth();
+        refreshRate = mode.getRefreshRate() / 1024;
+        isFullScreen = (gd.getFullScreenWindow() != null);
+        displayWidth = mode.getWidth();
+        displayHeight = mode.getHeight();
+    }
+
+    /**
+     * Returns a string representation of this instance.
+     */
+    public String toString ()
+    {
+        StringBuffer buf = new StringBuffer();
+
+        // hardware and platform information
+        buf.append("OS: ").append(osName).append(" (").
+            append(osVersion).append("-").append(osArch).append(")\n");
+        buf.append("JVM: ").append(javaVersion).
+            append(", ").append(javaVendor).append("\n");
+
+        // memory information
+        buf.append("Memory: ").append(freeMemory).append("k free, ").
+            append(usedMemory).append("k used, ").
+            append(totalMemory).append("k total, ").
+            append(maxMemory).append("k max\n");
+
+        // video information
+        String sbitDepth = (bitDepth == -1) ? "unknown bit depth" :
+            bitDepth + "-bit";
+        String srefreshRate =
+            (refreshRate == DisplayMode.REFRESH_RATE_UNKNOWN) ?
+            "unknown refresh rate" : (refreshRate + "kHz");
+        String sfullScreen = (isFullScreen) ? "full-screen" : "windowed";
+        buf.append("Display: ").append(displayWidth).append("x").
+            append(displayHeight).append(", ").append(sbitDepth).
+            append(", ").append(srefreshRate).append(", ").append(sfullScreen);
+
+        return buf.toString();
+    }
+}

projects/samskivert/tests/src/java/com/samskivert/util/SystemInfoDemo.java

@@ -0,0 +1,43 @@
+//
+// $Id: SystemInfoDemo.java,v 1.1 2003/01/14 22:07:06 shaper Exp $
+//
+// samskivert library - useful routines for java programs
+// Copyright (C) 2003 Walter Korman
+// 
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.samskivert.util;
+
+public class SystemInfoDemo
+{
+    public static void main (String[] args)
+    {
+        // output initial system information
+        SystemInfo info = new SystemInfo();
+        System.out.println("Initial system info:");
+        System.out.println(info.toString());
+
+        // allocate a bit of data
+        System.out.println("\nAllocating test data.");
+        for (int ii = 0; ii < 10000; ii++) {
+            int[] data = new int[100];
+        }
+
+        // update and output the latest system information
+        info.update();
+        System.out.println("\nUpdated system info:");
+        System.out.println(info.toString());
+    }
+}