/**
 * SystemThreadInfo enumerates all threads and thread groups.
 *
 * Copyright &copy; 1996-1998 Martin Minow. All Rights Reserved.<p>
 *
 * Permission to use, copy, modify, and redistribute this software and its
 * documentation for personal, non-commercial use is hereby granted provided that
 * this copyright notice and appropriate documentation appears in all copies. This
 * software may not be distributed for fee or as part of commercial, "shareware,"
 * and/or not-for-profit endevors including, but not limited to, CD-ROM collections,
 * online databases, and subscription services without specific license.<p>
 *
 * @author <a href="mailto:minow@apple.com">Martin Minow</a>
 * @version 1.0
 * Set tabs every 4 characters.
 */
import java.util.*;
import java.awt.*;

public class SystemThreadInfo extends SystemInfo
{
	public SystemThreadInfo(
			EtchedBorder		border
		)
	{
		super(border);
		try {
			/*
			 * Enumerate all threads and thread groups in the system.
			 * See the sample in The Java Class Libraries, volume 1
			 * in the Thread description.
			 */
			ThreadGroup	rootGroup		= Thread.currentThread().getThreadGroup();
			while (rootGroup.getParent() != null) {
				rootGroup				= rootGroup.getParent();
			}
			/*
			 * Create a vector that contains all threads in all groups.
			 */
			Thread[]	threads			= new Thread[rootGroup.activeCount()];
			int			threadCount		= rootGroup.enumerate(threads, true);
			/*
			 * Copy the thread information into a string vector.
			 */
			String[]	threadInfo		= new String[threadCount];
			for (int i = 0; i < threadCount; i++) {
				Thread	t				= threads[i];
				StringBuffer	state = new StringBuffer(
						(t.isAlive() ? "Alive" : "Dormant")
					);
				if (t.isInterrupted()) {
					state.append(", Interrupted");
				}
				if (t.isDaemon()) {
					state.append(", Daemon");
				}
				threadInfo[i]			=
						t.getThreadGroup().getName()				+ ", "
						+ t.getName()								+ ", "
						+ "Priority: "		+ t.getPriority()		+ ", "
						+ "Stack Frames: "	+ t.countStackFrames()	+ ", "
						+ state.toString()						+ "\n"
					;
			}
			threads						= null;	/* Dump the vector	*/
			JavaInfo.quickSort(threadInfo, 0, threadCount - 1);
			/*
			 * Now that the threads are organized by group, add
			 * them to the display. (We could, of course, scan
			 * through the list again to cleanup the formatting.
			 */
			for (int i = 0; i < threadCount; i++) {
				append(threadInfo[i]);
			}
			threadInfo					= null;	
		}
		catch (Exception e) {
			append("ThreadGroupInfo strange error: " + e + "\n");
			e.printStackTrace();
		}
	}
}