import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.util.zip.GZIPInputStream;

import com.fasterxml.jackson.databind.ObjectMapper;

public class Server implements Runnable {

private Integer listenPort;

private Thread t;

Server(Integer listenPort) throws IOException {

this.listenPort = listenPort;

System.out.printf("Server: Listening on port %d.\n", listenPort);

start();

}

public void start() {

if (t == null) {

t = new Thread (this, "ServerThread");

t.start();

}

}

@Override

public void run() {

try {

// Set up the socket to receive data

DatagramSocket serverSocket = null;

serverSocket = new DatagramSocket(listenPort);

// We don't know what the size of the incoming packet will be, so we allocate a bigger chunk

// A Datagram can be 65,507 bytes, max. The lorem ipsum text in main() should be about 795

// uncompressed bytes, so we'll set it a little higher for that, and truncate the null chars

// at the end

byte[] receiveData = new byte[800];

ByteArrayInputStream inputStream = new ByteArrayInputStream(receiveData);

// Receive a packet

DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);

serverSocket.receive(receivePacket);

// The packet is compressed, so it will need to be decompressed

System.out.printf("Server: Decompressing message.\n");

GZIPInputStream decompressed = new GZIPInputStream(inputStream);

decompressed.read(receiveData, 0, receiveData.length);

decompressed.close();

// Get the uncompressed data, and deserialize it

String data = new String( receivePacket.getData() );

ObjectMapper mapper = new ObjectMapper();

Message message = mapper.readValue(data.trim(), Message.class);

// Print the received thing to console

System.out.printf("Message received:\n\n%s", message.toString());

System.out.printf("Received %d uncompressed bytes.\n", data.trim().getBytes().length);

} catch (IOException e) {

e.printStackTrace();

}

}

}