/*
 * This customized code is based on an article published 
 * at http://www.kieser.net/linux/java_server.html
 * 
 * Title:        Sample Server
 * Description:  This utility will accept input from a socket, posting back 
 *               to the socket before closing the link. It is intended as a 
 *               template for coders to base servers on. 
 * 
 * Article:
 * 
 * A multi-threaded socket-based server
 * 
 * The problem is old - How to implement a multi-threaded, socket-based 
 * server that will let you read and write to the client (for example a 
 * telnet terminal.
 * 
 * There are several problems with constructing such a server:
 * 
 *     You have to use threads because otherwise clients will be 
 *     queued up waiting for a connection.
 * 
 *     Many of the publically available examples (even some in some books) 
 *     do not work for I/O servers. They are mostly developed around reading 
 *     from a socket not writing to the socket as well. In our example we 
 *     give a working read/write code example.
 * 
 *     You need to avoid race conditions when starting up a thread at 
 *     times when connections are coming through thick and fast.
 * 
 * The code below will implement just such a server. It is intended for a 
 * head start, so is a template rather than a tutorial on how to write a 
 * server in  Java. We have decided on port 4444 to listen on in the example, 
 * but you need to decide on a suitable port yourself.
 * 
 * The server will run, establishing connections from the port and echoing 
 * input received until it receives a line of input that is a full stop 
 * only ".".
 * 
 * Have fun!
 * 
 */
package com.linux_support;
 
import java.io.*;
import java.net.*;
import java.security.*;
 
/**
 *
 * @author mario
 */
public class JEmergancyWebServer {
 
    // default port for incoming connections
    private static int port = 4444;
 
    // define the max number of connection to be handled (0 == unlimited)
    private static int maxConnections = 0;
 
    /** Main method. It will start the server application.
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        int i = 0;
 
        try {
            ServerSocket listener = new ServerSocket(port);
            Socket server;
 
            while ((i++ < maxConnections) || (maxConnections == 0)) {
                DoTheJob connection;
 
                server = listener.accept();
                DoTheJob conn_c = new DoTheJob(server);
                Thread t = new Thread(conn_c);
                t.start();
            }
        } catch (IOException ioe) {
            // print error messages to the standard output device
            System.out.println("IOException on socket listen: " + ioe);
            ioe.printStackTrace();
        }
    }
}
 
class DoTheJob implements Runnable {
 
    private Socket server;
    private String line, input;
 
    DoTheJob(Socket server) {
        this.server = server;
    }
 
    public void run() {
 
        input = "";
 
        try {
            // Get input from the client
            DataInputStream in = new DataInputStream(server.getInputStream());
            PrintStream out = new PrintStream(server.getOutputStream());
 
            //while((line = in.readLine()) != null && !line.equals(".")) {
            // handle simpe requests containing header data only.
            while ((line = in.readLine()) != null && !line.equals("")) {
                input = input + line + "\n";
                // send the received line to the client
                //out.println("received line:" + line);
            }
 
            // print tht whole message to stdout
            input = input + "Status: 200\n";
            String msg = "Overall message is: n\n" + input;
            System.out.println(msg);
 
            // send response to client
            out.println(msg);
 
            server.close();
        } catch (IOException ioe) {
            System.out.println("IOException on socket listen: " + ioe);
            ioe.printStackTrace();
        }
    }
}