execwatchdogtimer.java

无线传感器网络节点Sun SPOT管理工具

/*
 * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved. 
 * 
 * Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product that is
 * described in this document. In particular, and without limitation, these intellectual property rights may
 * include one or more of the U.S. patents listed at http://www.sun.com/patents and one or more additional patents
 * or pending patent applications in the U.S. and in other countries.
 * 
 * U.S. Government Rights - Commercial software. Government users are subject to the Sun Microsystems, Inc.
 * standard license agreement and applicable provisions of the FAR and its supplements.
 * 
 * Use is subject to license terms. 
 * 
 * This distribution may include materials developed by third parties. Sun, Sun Microsystems, the Sun logo and
 * Java are trademarks or registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. 
 * 
 * Copyright (c) 2006 Sun Microsystems, Inc. Tous droits r?serv?s.
 * 
 * Sun Microsystems, Inc. d?tient les droits de propri?t? intellectuels relatifs ? la technologie incorpor?e dans
 * le produit qui est d?crit dans ce document. En particulier, et ce sans limitation, ces droits de propri?t?
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 * et un ou les brevets suppl?mentaires ou les applications de brevet en attente aux Etats - Unis et dans les
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 * Cette distribution peut comprendre des composants d?velopp?s par des tierces parties.
 * Sun, Sun Microsystems, le logo Sun et Java sont des marques de fabrique ou des marques d?pos?es de Sun
 * Microsystems, Inc. aux Etats-Unis et dans d'autres pays.
 */
package com.sun.spot.spotworld.usb.spotselector;

/**
 * The ExecWatchdogTimer class stops the CheckBaseStation process if it doesn't
 * respond for a given time.
 * 
 * @author Christian P黨ringer
 * 
 */
public class ExecWatchdogTimer extends Thread {
    private int time;

    private Process process;

    private boolean isVerbose;

    public ExecWatchdogTimer(int time, Process process) {
	this(time, process, false);
    }

    public ExecWatchdogTimer(int time, Process process, boolean isVerbose) {
	this.time = time;
	this.process = process;
	this.isVerbose = isVerbose;
    }

    public void run() {
	boolean restartWait;
	boolean processTerminated = false;
	do {
	    restartWait = false;

	    try {

		sleep(time);
	    } catch (InterruptedException e) {
		restartWait = true;
		if (isVerbose)
		    SpotSelector.infoOut
			    .println("Watchdog thread interrupted, going to sleep ("
				    + time + " ms)again ...");
	    }

	    // Check whether the process already finished an then exit
	    try {
		process.exitValue();
		processTerminated = true;
	    } catch (IllegalThreadStateException e) {
		processTerminated = false;
	    }

	} while ((restartWait) && (!processTerminated));
	if (!processTerminated) {
	    if (isVerbose)
		SpotSelector.infoOut
			.println("Execwatchdog timeout. Killing process...");
	    process.destroy();
	} else {
	    if (isVerbose)
		SpotSelector.infoOut
			.println("Execwatchdog exiting. Process returned normally");

	}

    }

}