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)
{
}
}
}
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