/* Angelehnt an Kurose/Ross Computernetzwerke (bis 5e Java, ab 6e Python) */

package socket;

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

class Server2 {
	public static void main(String argv[]) throws Exception {
		int port = 36037;

		ServerSocket serverSocket = new ServerSocket(port);

		String message;
		String modifiedMessage;
		
		System.out.println("Server2 gestartet. Warte auf eingehende Requests...");
		
		Socket connectionSocket = serverSocket.accept();
		while (true) {

			BufferedReader inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
			DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());

			// Try/Catch hinzugefügt, nachdem bei Einsatz mit Amazon AWS (Healthcheck des ELB) message null war  
			try {
				message = inFromClient.readLine();
				if (message != null) {
					System.out.println("Request von Client2 " + connectionSocket.getInetAddress() + ":" + connectionSocket.getPort() + " empfangen. Erzeuge und sende Antwort...");

					if (message.equals("exit")) {
						break;
					}

					modifiedMessage = message.toUpperCase() + '\n';
					outToClient.writeBytes(modifiedMessage);
				}
			} catch (IOException ioe) {
				ioe.printStackTrace();
			}
		}
		connectionSocket.close();
		serverSocket.close();
	}
}