// SimpleServerSocket

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

/**
 * This is a simple server socket example with two static methods: 
 * server deamon waiting for clients and service provider.
 * @author Jeff Zhuk
 */
public class SimpleServerSocket {
  // Open server socket and listen for client requests
  public static void startServerDeamon(int iPort)
  {
      ServerSocket server = null;
      // register server socket on the port = iPort
      try {
          server = new ServerSocket(iPort);
      } catch (IOException e) {
          System.out.err("Server socket failure: " + e);
          return;
      }
      Socket client = null;
      DataInputStream in = null;
      PrintStream out = null;

      // start indefinite loop waiting for clients to accept
      while(true)
      {
          try {
              // listen for a client connection to accept
              client = server.accept();

              // connect input/output streams to the socket
              in = new DataInputStream(client.getInputStream());
              out = new PrintStream(client.getOutputStream());

              // read client request, a string is expected, not bytes!
              String clientRequest = in.readLine();

              // process this client request and get a response for a client

              String response = serviceMethod(clientRequest, in); // service

              // Send the response back to the client. It's a string operation.

              out.println(response); // success or failure
   
              // close the client connection, keep alive the server socket
              client.close();
         } catch (IOException e) {
             System.out.err("Server socket failure: " + e);
         }
      }
   }
  // The simplest example of the service on the server side
  public static String serviceMethod(String iRequest, DataInputStream iStream) {
    // find out what service is needed
    // read additional info from the input stream if necessary
    // provide the service
  }
}