/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: Intr.java,v 1.5 2004/02/09 03:34:06 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by Ian F. Darwin.
 * 4. Neither the name of the author nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

// import - none

/**
 * Interrupt a read, and then resume it.
 * @author	Ian F. Darwin, http://www.darwinsys.com/
 */
public class Intr implements Runnable {
	/** The Thread we are timing. */
	Thread timedThread;

	/** How long to give the Thread */
	int time;

	public Intr(int mSec) {
		time = mSec;
		timedThread = new Thread(this);
		System.out.println("Intr.<init>: Thread " + timedThread);
		timedThread.setPriority(Thread.MAX_PRIORITY);
		timedThread.setName("TimedThread");
		timedThread.start();
	}

	public void run() {
		while (timedThread != null) {
			System.out.println("About to sleep for " + time + "mSec");
			try {
				Thread.sleep(time);
			} catch (InterruptedException ie) {
				System.err.println("Unexpectedly interrupted time sleep!");
				return;
			}
			if (timedThread == null)
				return;
			// if we are still here, the timer went off, but the
			// main program hasn't nullified the thread yet.
			System.out.println("Will now interrupt sleep of " + timedThread);
			timedThread.interrupt();
		}
	}

	/** Simple test case */
	public static void main(String[] ap) {
		byte b[] = new byte[10];
		System.out.println("Creating Intr");
		Intr me = new Intr(2000);
		System.out.println("Starting read");
		for (int i=1; i<=5; i++) {
			try {
				// This read will block, unless you type something in
				// the console window (and you have to be pretty quick!).
				int n = System.in.read(b);
				System.out.print(">> ");
				for (int j=0; j<n; j++) {
					if (b[j] == '\n' || b[j] == '\r')
						break;
					System.out.print((char)b[j]);
				}
				System.out.println(" <<");
				if (b[0] == (byte)'Q')
					return;

			} catch (java.io.InterruptedIOException e) {
				System.out.println("Interrupted IO");
			} catch (Exception e) {
				// Other exceptions are more painful
				System.out.println("Caught " + e);
			}
		}
		me.timedThread = null;
		System.out.println("All done");
	}
}