/*
* Implements IFacadeService
*/
public bool Connect()
{
if (!_isOnline)
{
_isOnline = true;
StartServices();
Log.Show(_username, "Attempting to Register user on central server\n");
_slotManager.Connect();
while (true)
{
try
{
Helper.GetRandomServer(_servers).RegisterUser(_username, Helper.GetIPAddress(), _port);
Log.Show(_username, "Succesfully Registered\n");
break;
}
catch (Exception e)
{
Log.Debug(_username, "\nEXCEPTION: " + e.Message);
}
}
return(true);
}
return(false);
}
private IBookingService LookupClientStub(string userID)
{
ClientMetadata clientMd = null;
bool contacted = false;
while (!contacted)
{
try
{
//TODO: Navaneeth: here
Log.Show(_userName, "#1");
clientMd = _activeServer.Lookup(userID);
Log.Show(_userName, "#2");
contacted = true;
}
catch (Exception)
{
//server has failed
//update server reference
_activeServer = Helper.GetRandomServer(_servers);
}
}
IBookingService client = null;
if (clientMd != null)
{
String connectionString = "tcp://" + clientMd.IP_Addr + ":" + clientMd.Port + "/" + clientMd.Username + "/" + Common.Constants.BOOKING_SERVICE_NAME;
//Log.Debug(_userName, "Looking up participant stub: " + connectionString);
try
{
client = (IBookingService)Activator.GetObject(
typeof(ILookupService),
connectionString);
}
catch (SocketException e)
{
Log.Show(_userName, "ERROR: Could not connect to client: " + clientMd.Username + ". Exception: " + e);
//TODO: do something?
}
}
return(client);
}
private int RetrieveSequenceNumber()
{
int seqNumber = -1;
while (seqNumber == -1)
{
try
{
seqNumber = Helper.GetRandomServer(_servers).NextSequenceNumber();
}
catch (Exception)
{
Console.WriteLine("\nCaught Exception Here!!\n");
//server has failed
//will try to get another server in next iteration
}
}
return(seqNumber);
}
void IClientMonitor.StartMonitoring()
{
_activeServer = Helper.GetRandomServer(_servers);
while (true)
{
//Monitor all monitored reservations
foreach (Reservation res in _monitoredReservations.Values)
{
//Only check a reservation if some participant is not online
if (res.ClientStubs.Count < (res.Participants.Count - 1))
{
//copy client stubs dictionary (to avoid unecessary synchronization)
Dictionary <string, IBookingService> clientStubs = new Dictionary <string, IBookingService>(res.ClientStubs);
foreach (string userID in res.Participants)
{
//If we do not have the stub of a given participant, check for it
if (!userID.Equals(_userName) && !clientStubs.ContainsKey(userID))
{
Log.Debug(_userName, "Verifying if offline participant " + userID + " of reservation " + res.ReservationID + " came online.");
IBookingService client = LookupClientStub(userID);
if (client != null)
{
Log.Show(_userName, "Participant " + userID + " of reservation " + res.ReservationID + " has just came online.");
_msgDispatch.ClientConnected(userID, client);
//Lock here
res.ClientStubs[userID] = client;
//Unlock here
}
}
}
}
}
Thread.Sleep(SERVER_QUERY_TIME);
}
}
bool IClientFacade.Disconnect()
{
//pms.show(" ("+_username+")"+" I have received a Disconnect message");
if (_isOnline)
{
_isOnline = false;
_slotManager.Disconnect();
Console.WriteLine("\nAttempting to Unregister user on central server\n");
StopServices();
while (true)
{
try
{
// Helper.GetRandomServer(_servers).Lookup("Paulo");
// Log.Show(_username, "[DEBUG] Lookup for Paulo");
Helper.GetRandomServer(_servers).UnregisterUser(_username);
Log.Show(_username, "Succesfully Unregistered.");
break;
}
catch (Exception e)
{
Log.Debug(_username, "\nEXCEPTION: " + e.Message);
}
}
//Broadcast offline information to initiators of ongoing reservations
Log.Show(_username, "Client is disconnected.");
return(true);
}
return(false);
}
