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

class BroadcastClientHandler extends Thread {

  protected Socket incoming; 
  protected int id; 
  protected BufferedReader in; 
  protected PrintWriter out;
 
  public BroadcastClientHandler(Socket incoming, int id) {
    this.incoming = incoming; 
    this.id = id; 
    try {
      if (incoming != null) {
	in = new BufferedReader(new InputStreamReader(incoming.getInputStream())); 	    
	out = new PrintWriter(new OutputStreamWriter(incoming.getOutputStream())); 	    
      }
    } catch (Exception e) {
      System.out.println("Error: " + e); 
    }
  }

  public synchronized void putMessage(String msg) {
    if (out != null) {
      out.println(msg); 
      out.flush();
    }
  }

  public void run() {
    System.out.println("Client handler " + id + " started."); 
    if (in != null && 
	out != null) {
      putMessage("Hello! This is Java BroadcastEchoServer. Enter BYE to exit.");       
      try {
	for (;;) {
	  String str = in.readLine(); 
	  if (str == null) {
	    break; 
	  } else {
	    putMessage("Echo: " + str); 
	    System.out.println("Received (" + id + "): " + str);

	    if (str.trim().equals("BYE")) {
	      break; 
	    } else {
	      Enumeration enum = BroadcastEchoServer.activeThreads.elements(); 
	      while  (enum.hasMoreElements()) {
		BroadcastClientHandler t = 	
		    (BroadcastClientHandler) enum.nextElement(); 
		if (t != this) {
		  t.putMessage("Broadcast(" + id + "): " + str); 
		}
	      }
	    }
	  }
	}
	incoming.close(); 
	BroadcastEchoServer.activeThreads.removeElement(this); 
      } catch (IOException e) {} 
    }
    System.out.println("Client thread " + id + " stopped."); 
  }

}

public class BroadcastEchoServer {

  static protected Vector activeThreads; 

  public static void main(String[] args) {
    System.out.println("BroadcastEchoServer started."); 
    activeThreads = new Vector(); 
    int i = 1; 
    try {
      ServerSocket s = new ServerSocket(8010); 
      for (;;) {
	Socket incoming = s.accept(); 
	System.out.println("Spawning client thread " + i);
	BroadcastClientHandler newThread = 
	  new BroadcastClientHandler(incoming, i); 
	activeThreads.addElement(newThread); 
	newThread.start(); 
	i++; 
      }
    } catch (Exception e) {
      System.out.println("Error: " + e); 
    }

    System.out.println("BroadcastEchoServer stopped."); 
  }
}