import java.io.*;
import java.net.*;
/* *******************************************************************
                                                        Bert G. Wachsmuth
                                                             June 3, 1996

   Part of JokeServer: This JokeHandler thread understands the following 
   commands:
   
      get:      server sends a knock-knock joke
      bye:      server closes thread for a connection, waits for next one
      shutdown: server shuts down completely, no more connections possible

  The thread waits for a new connection, serves it, and waits for next 
  connection
  ******************************************************************* */
class JokeHandler extends Thread 
{
   private static int   thePort = 4444;
   private static final int NUMJOKES = 5;
   private String       clues[] = 
                        { "Turnip", "Little Old Lady", "Atch", "Who", "Who" };
   private String       answers[] = 
                        {"Turnip the heat, it's cold in here!",
                         "I didn't know you could yodel!",
                         "Bless you!",
                         "Is there an owl in here?",
                         "Is there an echo in here?" };
   private String       inputLine;
   private ServerSocket serverSocket = null;
/* ******************************************************************* */
   JokeHandler() 
   {
      super("JokeServer");

      try 
      {
         serverSocket = new ServerSocket(thePort);
         System.out.println("Server started at port " + thePort);
      } 
      catch (IOException e) 
      {
         System.out.println("Port " + thePort + " unavailable: " + e);
         System.exit(1);
      }
   }
/* ******************************************************************* */
   public void run() 
   {
      if (serverSocket == null)
         return;
      while (true) 
      {
         Socket clientSocket = null;
         try 
         {
            clientSocket = serverSocket.accept();
            System.out.println("New Connection accepted");
         } 
         catch (IOException e) 
         {
            System.out.println("Accept failed: " + thePort + ", " + e);
            System.exit(1);
         }
         try 
         {
            DataInputStream inStream = new DataInputStream(
                                       new BufferedInputStream(clientSocket.getInputStream()));
            PrintStream outStream    = new PrintStream(
                                       new BufferedOutputStream(clientSocket.getOutputStream(), 1024), false);
            outStream.println("JokerServer ready");
            outStream.flush();

            while ((inputLine = inStream.readLine()) != null) 
            {
               if (inputLine.equalsIgnoreCase("Get"))
                  ServeJoke(outStream);
               else if (inputLine.equalsIgnoreCase("Bye"))
                  break;
               if (inputLine.equalsIgnoreCase("Shutdown"))
                  System.exit(0);
            }
            outStream.close();
            inStream.close();
            clientSocket.close();
         } 
         catch (IOException e) 
         {
            e.printStackTrace();
         }
      }
   }
/* ******************************************************************* */
   protected void finalize() 
   {
      if (serverSocket != null) 
      {
         try 
         {
            serverSocket.close();
         } 
         catch (IOException e) 
         {
            e.printStackTrace();
         }
         serverSocket = null;
      }
   }  
/* ******************************************************************* */
   private void ServeJoke(PrintStream outStream)
   {
      int currentJoke = (int)(Math.random() * NUMJOKES);

      outStream.println(clues[currentJoke]);
      outStream.flush();
      outStream.println(answers[currentJoke]);
      outStream.flush();
   }
/* ******************************************************************* */
}