//-------------------------------------------------------------------------
// File:        Server.java
//
// Created by:  Tamer Elsharnouby (sharno@cs.umd.edu)
// 
// Course:      Project 1, CMSC417-0101 Fall 1999
//
// Description: Creates a server that waits on a specifed port and assigns
//              a ServerThread to each client requesting a connection.
//-------------------------------------------------------------------------

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

//------------------------------------------------------------------------
//  Class:  Server
//  
//  Creates the server's socket waiting on a specifed port, and launches
//  a ServerThread for each client that requests a connection.
//  Terminated by killing process from shell (eg, control-C).
//
//  Attributes
//   sSock:    Socket on which server listens for new clients
//   sPort:    Server port number (for sSock); passed from command line.
//
//  Methods
//   main:     The main method for the Server class.
//------------------------------------------------------------------------

class Server {
  static ServerSocket sSock;
  static int sPort;
  static String responsePrefix;

  //-------------------------------------------------------------------
  // Method:  main
  // 
  // Run body of server. Creates socket and assigns thread to each client.
  //
  // Parameters
  //  args:    First argument is response prefix.
  //           Second argument is the assigned port number.
  //
  // Variables
  //  cSock:   Socket of ServerThread by which it connects to client.
  //
  // Returns:  none

  public static void main (String[] args) {
      // Gets assigned port number from command line arguments

    responsePrefix = args[0].toString();
    sPort = Integer.parseInt(args[1]);
    System.err.println("Socket Port: " + sPort);
    
    try {
	// Create server socket with port "sPort".
      sSock = new ServerSocket(sPort);
    } catch (IOException e) {
      System.err.println("Unable to bind Server to port" + sPort);
      e.printStackTrace();
    }

    while (true){
	Socket cSock = null;

	// Accept a requesting client and assign it socket cSock
	try {
	    cSock = sSock.accept();
	} catch (IOException e) {
	    System.err.println("Accept failed on server port");
	    e.printStackTrace();
	}

	// Launch a new ServerThread to deal with the accepted client
	new ServerThread(cSock, responsePrefix ).start();
    }

  } //---------------- method main -------------------------------------

} //------------------ Class Server ------------------------------------