//
// samskivert library - useful routines for java programs
// Copyright (C) 2001-2012 Michael Bayne, et al.
// http://github.com/samskivert/samskivert/blob/master/COPYING
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;
/** Whether the video display is headless or video information is
* unavailable. */
public boolean isHeadless;
/** 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
isHeadless = GraphicsEnvironment.isHeadless();
if (!isHeadless) {
try {
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();
} catch (Throwable t) {
isHeadless = true;
}
}
}
/**
* Returns a terse readable string representation of the operating
* system name, version and architecture.
*/
public String osToString ()
{
return osName + " (" + osVersion + "-" + osArch + ")";
}
/**
* Returns a terse readable string representation of the java virtual
* machine version and vendor.
*/
public String jvmToString ()
{
return javaVersion + ", " + javaVendor;
}
/**
* Returns a terse readable string representation of memory usage.
*/
public String memoryToString ()
{
return freeMemory + "k free, " + usedMemory + "k used, " +
totalMemory + "k total, " + maxMemory + "k max";
}
/**
* Returns a terse readable string representation of the video display
* settings.
*/
public String videoToString ()
{
if (isHeadless) {
return "headless or unavailable";
}
String sdepth = (bitDepth == -1) ? "unknown bit depth" :
bitDepth + "-bit";
String srate = (refreshRate == DisplayMode.REFRESH_RATE_UNKNOWN) ?
"unknown refresh rate" : (refreshRate + "kHz");
String sfull = (isFullScreen) ? "full-screen" : "windowed";
return displayWidth + "x" + displayHeight + ", " + sdepth + ", " +
srate + ", " + sfull;
}
@Override
public String toString ()
{
StringBuilder buf = new StringBuilder();
buf.append("OS: ").append(osToString()).append("\n");
buf.append("JVM: ").append(jvmToString()).append("\n");
buf.append("Memory: ").append(memoryToString()).append("\n");
buf.append("Video: ").append(videoToString());
return buf.toString();
}
}