import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.ServerSocket;

public class Server implements Runnable {
    private ServerSocket socket;

    public Server(int port) {
        try {
            this.socket = new ServerSocket(port);
            System.out.println("Server is listening on port" + port
                    + ". Type 'exit' to stop.\n");
            new Thread(this).start();
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    System.in));
            while (!reader.readLine().trim().toLowerCase().equals("exit"))
                ;
            this.socket.close();
            System.out.println("Server was stopped.");
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }

    public void run() {
        try {
            while (!this.socket.isClosed())
                new Connection(this.socket.accept());
        } catch (Exception e) {
        System.out.println(e.getMessage());
        }
    }

    public static void main(String[] args) {
        if (args.length == 1)
            new Server(Integer.parseInt(args[0]));
        else
            System.out.println("Usage: java Server <port>");
    }

}