public void RetrieveAvailableUsers()
{
// preparing request
byte[] byteToSend = Encoding.ASCII.GetBytes(JsonConvert.SerializeObject(_me));
while (_continueRequesting)
{
bool timedOut = false;
// sending request
_udpClient.Send(byteToSend, byteToSend.Length, _broadcastIp);
// ip end point used to record address and port of sender
IPEndPoint remoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
while (!timedOut)
{
byte[] recBytes = null;
try
{
// blocked until a message is received
recBytes = _udpClient.Receive(ref remoteIpEndPoint);
}
catch (SocketException e)
{
if (!e.SocketErrorCode.Equals(SocketError.TimedOut))
{
throw new Exception("Unexpected exception", e);
}
timedOut = true;
// call the functions registered to the delegate, in particular in userSelection
// clearing expired users
CleanUsersEvent();
}
if (!IpUtils.IsSelfMessage(remoteIpEndPoint) && !timedOut)
{
// reading response
string readData = Encoding.ASCII.GetString(recBytes);
// parsing available user
User availableUser = JsonConvert.DeserializeObject <User>(readData);
availableUser.IPAddress = remoteIpEndPoint.Address.ToString();
availableUser.LastUpTime = DateTime.Now;
// call the functions registered to the delegate, in particular in userSelection
// adding new user
AddUserEvent(availableUser);
}
}
}
}
public void Listen()
{
while (_statusAvailableEvent.WaitOne())
{
try
{
// ip end point used to record address and port of sender
IPEndPoint remoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
// blocked until a message is received
byte[] recBytes = _udpServer.Receive(ref remoteIpEndPoint);
if (!IpUtils.IsSelfMessage(remoteIpEndPoint))
{
// reading requester user
//string readData = Encoding.ASCII.GetString(recBytes);
//User requesterUser = JsonConvert.DeserializeObject<User>(readData);
//requesterUser.IPAddress = remoteIpEndPoint.Address.ToString();
// updating machine identity
UpdateMe();
// preparing response
byte[] byteToSend = Encoding.ASCII.GetBytes(JsonConvert.SerializeObject(_me));
// sending response
_udpServer.Send(byteToSend, byteToSend.Length, remoteIpEndPoint);
}
}
catch (Exception e)
{
Console.WriteLine("problems while udp responding");
Console.WriteLine(e);
}
}
}
