import java.net.DatagramSocket;
import java.net.DatagramPacket;
import java.net.InetSocketAddress;
import java.util.Date;
import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class TimeServerDG {
    public static void main (String[] args) {
	if (args.length < 1) {
	    System.err.println ("Usage: TimeServerDG <file>");
	    return;
	}
	try {
	    List<String> recipients = new ArrayList<String>();
	    BufferedReader in = new BufferedReader (new FileReader(args[0]));
	    String next = null;
	    while ((next = in.readLine()) != null)
		recipients.add(next);
	    in.close();

	    InetSocketAddress[] hosts = new InetSocketAddress[recipients.size()];
	    int i = 0;
	    for (String host : recipients)
		hosts[i++] = new InetSocketAddress (host, port);

	    DatagramSocket t_socket = new DatagramSocket();

	    while (true) {
		byte[] t_bytes = new Date().toString().getBytes();
		DatagramPacket t_packet = new DatagramPacket (t_bytes, t_bytes.length);
		for (i = 0; i < hosts.length; i++) {
		    t_packet.setSocketAddress (hosts[i]);
		    t_socket.send (t_packet);
		}
		Thread.sleep (winks);
	    }
	}
	catch (IOException e) { System.err.println (e); }
	catch (InterruptedException e) { System.err.println (e); }
    }

    private static final int port = 10001;
    private static final int winks = 10000;
}