package MV3500Cohort2018JulySeptember.homework1;

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

/**
 * The simplest possible TCP network program. It listens for
 * a connection, from telnet (telnet localhost 2317) or a program
 * you write, which we will do later. Right now the TcpExample simply
 * writes a string in response to a connection. 
 * 
 * Testing the running server program from telnet looks like this:
 * 
 * it154916:projects mcgredo$ telnet localhost 2317
 * Trying ::1...
 * Connected to localhost.
 * Escape character is '^]'.
 * This was written by the server
 * Connection closed by foreign host.
 * 
 * Notice that "This was written by the server" matches 
 * what is written by the code below, over the output stream.
 * 
 * After this first connection the program below drops out
 * the bottom of the program, and does not repeat itself.
 * The program exits.
 * 
 * @author mcgredo
 */
public class FriscoAssignment1 
{
    /**
     * Default constructor to silence javadoc warning
     * @see <a href="https://stackoverflow.com/questions/4488716/java-default-constructor" target="_blank">StackOverflow: Java default constructor</a>
     */
    public FriscoAssignment1 ()
    {
        // default initializations occur here
    }
    /** run the program
     * @param args command-line arguments, string parameters (unused) */
    public static void main(String[] args) 
    {
        try
        {
            // The ServerSocket waits for a connection from a client.
            // It returns a Socket object when the connection occurs.
            ServerSocket serverSocket = new ServerSocket(2317);
            
            // The Socket object represents the connection between
            // the server and client, including a full duplex
            // connection
            Socket clientConnection = serverSocket.accept();
            
            // Use Java io classes to write text (as opposed to
            // unknown bytes of some sort) to the client
            OutputStream os = clientConnection.getOutputStream();
            PrintStream ps = new PrintStream(os);
            
                    ps.println("This client response was written by server FriscoAssignment1"); // to remote client
            System.out.println("This server response was written by server FriscoAssignment1"); // to server console
                    ps.println("No time to say 'Hello, Goodbye' I'm late, I'm late, I'm late");
            // "flush()" in important in that it forces a write 
            // across what is in fact a slow connection
            ps.flush();
            
            clientConnection.close();
        }
        catch(Exception e)
        {
            System.out.println("I am sorry Neo but you took the 'Red pill': " + e);
        }
    }
}