public SocketHandler(int port) throws IOException 
{
      serverSocket = new ServerSocket(port);
      setName("TelnetAppender-" + getName() + "-" + port);
}

 public  void close() 
{
      for(Enumeration e = connections.elements();e.hasMoreElements();) {
        try {
          ((Socket)e.nextElement()).close();
        } catch(Exception ex) {
        }
      }
      try {
        serverSocket.close();
      } catch(Exception ex) {
      }
}

make sure we close all network connections when this handler is destroyed.

 public  void finalize() 
{
       
        close();
}

 public  void run() 
{
      while(!serverSocket.isClosed()) {
        try {
          Socket newClient = serverSocket.accept();
          PrintWriter pw = new PrintWriter(newClient.getOutputStream());
          if(connections.size() <  MAX_CONNECTIONS) {
            connections.addElement(newClient);
            writers.addElement(pw);
            pw.print("TelnetAppender v1.0 (" + connections.size() 
		     + " active connections)\r\n\r\n");
            pw.flush();
          } else {
            pw.print("Too many connections.\r\n");
            pw.flush();
            newClient.close();
          }
        } catch(Exception e) {
          if (!serverSocket.isClosed()) {
            LogLog.error("Encountered error while in SocketHandler loop.", e);
          }
          break;
        }
      }
      try {
          serverSocket.close();
      } catch(IOException ex) {
      }
}

Continually accepts client connections. Client connections are refused when MAX_CONNECTIONS is reached.

 public  void send(String message) 
{
      Enumeration ce = connections.elements();
      for(Enumeration e = writers.elements();e.hasMoreElements();) {
        Socket sock = (Socket)ce.nextElement();
        PrintWriter writer = (PrintWriter)e.nextElement();
        writer.print(message);
        if(writer.checkError()) {
          // The client has closed the connection, remove it from our list:
          connections.remove(sock);
          writers.remove(writer);
        }
      }
}

sends a message to each of the clients in telnet-friendly output.