package org.apache.commons.net.time;/* ==================================================================== * * The Apache Software License, Version 1.1 * * Copyright (c) 2003 The Apache Software Foundation.  All rights * reserved. * * 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. The end-user documentation included with the redistribution, if *    any, must include the following acknowlegement: *       "This product includes software developed by the *        Apache Software Foundation (http://www.apache.org/)." *    Alternately, this acknowlegement may appear in the software itself, *    if and wherever such third-party acknowlegements normally appear. * * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software *    Foundation" must not be used to endorse or promote products derived *    from this software without prior written permission. For written *    permission, please contact apache@apache.org. * * 5. Products derived from this software may not be called "Apache" *    nor may "Apache" appear in their names without prior written *    permission of the Apache Group. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR * ITS 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. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation.  For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. */import java.io.DataOutputStream;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;/** * The TimetSimpleServer class is a simple TCP implementation of a server * for the Time Protocol described in RFC 868. * <p> * Listens for TCP socket connections on the time protocol port and writes * the local time to socket outputStream as 32-bit integer of seconds  * since midnight on 1 January 1900 GMT. * See <A HREF="ftp://ftp.rfc-editor.org/in-notes/rfc868.txt"> the spec </A> for * details. * <p> * Note this is for <B>debugging purposes only</B> and not meant to be run as a realiable time service. * * @author Jason Mathews, MITRE Corporation * * @version $Revision: 1.1 $ $Date: 2003/09/24 21:51:48 $ */public class TimeTestSimpleServer implements Runnable{    /**     * baseline time 1900-01-01T00:00:00 UTC     */    public static final long SECONDS_1900_TO_1970 = 2208988800L;    /*** The default time port.  It is set to 37 according to RFC 868. ***/    public static final int DEFAULT_PORT = 37;    private ServerSocket server;    private int port;    private boolean running = false;    /**     * Default constructor for TimetSimpleServer.     * Initializes port to defaul time port.     */    public TimeTestSimpleServer()    {        port = DEFAULT_PORT;    }    /**     * Constructor for TimetSimpleServer given a specific port.     */    public TimeTestSimpleServer(int port)    {        this.port = port;    }    public void connect() throws IOException    {        if (server == null)        {            server = new ServerSocket(port);        }    }    public int getPort()    {        return server == null ? port : server.getLocalPort();    }    public boolean isRunning()    {        return running;    }    /**     * Start time service and provide time to client connections.     * @throws IOException     */    public void start() throws IOException    {        if (server == null)	{            connect();	}	if (!running)	{	    running = true;	    new Thread(this).start();	}    }    public void run()    {        Socket socket = null;        while (running)        {            try            {                socket = server.accept();                DataOutputStream os = new DataOutputStream(socket.getOutputStream());                // add 500 ms to round off to nearest second                int time = (int) ((System.currentTimeMillis() + 500) / 1000 + SECONDS_1900_TO_1970);                os.writeInt(time);                os.flush();            } catch (IOException e)            {            } finally            {                if (socket != null)                    try                    {                        socket.close();  // force closing of the socket                    } catch (IOException e)                    {                        System.err.println("close socket error: " + e);                    }            }        }    }    /**     * Close server socket.     */    public void stop()    {        running = false;        if (server != null)        {            try            {                server.close();  // force closing of the socket            } catch (IOException e)            {                System.err.println("close socket error: " + e);            }            server = null;        }    }    public static void main(String[] args)    {        TimeTestSimpleServer server = new TimeTestSimpleServer();        try        {            server.start();        } catch (IOException e)        {        }    }}