// This example is from the book _Java Threads_ by Scott Oaks and Henry Wong. 
// Written by Scott Oaks and Henry Wong.
// Copyright (c) 1997 O'Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or implied.

// Sample TCPServer -- Chapter 8, p. 192.  See also the TCPServer class
// from chapter 5.

import java.net.*;
import java.io.*;

public class TCPServer implements Cloneable, Runnable {
    Thread runner = null;
    ServerSocket server = null;
    Socket data = null;
    ThreadGroup group = null;
    int groupNo = 0;

    public synchronized void StartServer(int port) throws IOException {
        if (runner == null) {
            server = new ServerSocket(port);
            runner = new Thread(this);
            runner.start();
        }
    }

    public synchronized void StopServer() {
        if (server != null) runner.stop();
    }

    public void run() {
        if (server != null) {
            while (true) {
                try {
                    Socket datasocket = server.accept();
                    TCPServer newSocket = (TCPServer) clone();

                    newSocket.server = null;
                    newSocket.data = datasocket;
                    newSocket.group =
                        new ThreadGroup("Client Group " + groupNo++);
                    newSocket.runner =
                        new Thread(newSocket.group, newSocket);
                    newSocket.runner.start();
                } catch (Exception e) {}
            }
        } else {
            run(data);
        }
    }
 
    public void run(Socket data) {
    }
}