//: c15:ChatterServer.java
// From Thinking in Java, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// A server that echoes datagrams
// Adpated by Agustin J. Gonzalez to remove Dgram class dependency.

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

public class ChatterServer_agv {
  static final int INPORT = 1711;
  private byte[] buf = new byte[1000];
  private DatagramPacket dp = new DatagramPacket(buf, buf.length);
  // Can listen & send on the same socket:
  private DatagramSocket socket;

  public ChatterServer_agv() {
    try {
      socket = new DatagramSocket(INPORT);
      System.out.println("Server started");
      while(true) {
        // Block until a datagram appears:
        socket.receive(dp);
        String rcvd = new String(dp.getData(), 0, dp.getLength()) + ", from address: " +
                      dp.getAddress() + ", port: " + dp.getPort();
        System.out.println(rcvd);
        String echoString = "Echoed: " + rcvd;
        // Extract the address and port from the
        // received datagram to find out where to
        // send it back:
        dp.setData (echoString.getBytes());
        dp.setAddress(dp.getAddress());
        dp.setPort(dp.getPort());
        socket.send(dp);
      }
    } catch(SocketException e) {
      System.err.println("Can't open socket");
      System.exit(1);
    } catch(IOException e) {
      System.err.println("Communication error");
      e.printStackTrace();
    }
  }
  public static void main(String[] args) {
    new ChatterServer_agv();
  }
}