private void listen() throws Exception {
System.out.println("Listening on port: " + serverPort);
// Initialize socket
socket = new DatagramSocket(serverPort);
// While running
while (run) {
// Wait for handshake
packet = new DatagramPacket(response, response.length);
socket.receive(packet); // Blocking
// System.out.println("RT: got packet");
Packet p = new Packet(packet.getData());
if (p.isHandshake()) {
// System.out.println("RT: is handshake");
// Get client connection info
InetAddress IPAddress = packet.getAddress();
int port = packet.getPort();
// Process handshake
processHandshake(p, IPAddress, port);
// Get message
MyMessage message = getMessage();
if (message != null) {
rc.rreceive(message);
}
}
}
}
private MyMessage getMessage() throws Exception {
int dataRecieved = 0;
String m = new String();
String t;
// FIXME needs to get multiple packets and messages
// System.out.println("RT: Now waiting for message data");
while (dataRecieved < totalDataSize) {
// Get message data
response = new byte[65000];
DatagramPacket packet = new DatagramPacket(response, response.length);
socket.receive(packet);
Packet p = new Packet(packet.getData());
// System.out.println("RT: Got message with seqnum: "+p.getSeqNum());
// If we have a handshake packet something broke
if (p.isHandshake()) {
return null;
}
// If next in-order packet grab data and is not corrupt
// XXX
if (p.getSeqNum() == seqNum + 1 && p.checkChecksum()) {
// Get the message ( part? )
// System.out.println("RT: Is correct seqnum");
t = p.getMessages().get(0).getMessageContents();
// System.out.println("RT: Got message packet: " + t);
m += t;
// Send ack
sendAck(p, packet);
// Increment counters
dataRecieved += t.length();
seqNum++;
} else {
System.out.println("RT: Is NOT correct seqnum");
}
}
MyMessage result = new MyMessage();
result.setMessageContents(m);
return result;
}
