public bool SubscribeToStockPrice(string stocksym, double triggerPrice)
{
try
{
IStockCallback callbackChannel = OperationContext.Current.GetCallbackChannel <IStockCallback>();
bool ifNewSubscriber = true;
foreach (SubscribeInfo sub in SubscriberList)
{
if (sub.ChannelToClient == callbackChannel) //found subscriber
{
ifNewSubscriber = false;
sub.AddSymbol(stocksym, triggerPrice);
}
}
if (ifNewSubscriber)
{
SubscribeInfo subscriber = new SubscribeInfo();
SubscriberList.Add(subscriber);
subscriber.ChannelToClient = callbackChannel;
subscriber.AddSymbol(stocksym, triggerPrice);
}
}
catch (Exception ex)
{
throw new FaultException(ex.Message, new FaultCode("Subscription Error"));
}
return(true);
}
public bool UnSubscribeToStockPrice(string stocksym)
{
try
{
IStockCallback callbackChannel = OperationContext.Current.GetCallbackChannel <IStockCallback>();
SubscribeInfo subToRemove = null;
foreach (SubscribeInfo sub in SubscriberList)
{
if (sub.ChannelToClient == callbackChannel) //found subscriber
{
sub.RemoveSymbol(stocksym);
if (sub.GetNumOfSymbolsSubscribed() == 0)
{
subToRemove = sub;
}
}
}
if (subToRemove != null)
{
SubscriberList.Remove(subToRemove);
}
}
catch (Exception ex)
{
throw new FaultException(ex.Message, new FaultCode("UnSubscription Error"));
}
return(true);
}
public void RegisterForQuote(string stockId)
{
lock (_registrations)
{
if (!_registrations.ContainsKey(stockId))
{
_registrations[stockId] = new List <IStockCallback>();
}
}
IStockCallback callback = OperationContext.Current.GetCallbackChannel <IStockCallback>();
_registrations[stockId].Add(callback);
}
public bool SubscribeToStockPrice(string stocksym, double triggerPrice)
{
try
{
IStockCallback callbackChannel = OperationContext.Current.GetCallbackChannel <IStockCallback>();
if (SubscriberList.Contains(callbackChannel) == false)
{
SubscriberList.Add(callbackChannel);
}
}
catch (Exception ex)
{
throw new FaultException(ex.Message, new FaultCode("Subscription Error"));
}
return(true);
}
public void Login()
{
string sessionID = OperationContext.Current.SessionId;
IStockCallback client = OperationContext.Current.GetCallbackChannel <IStockCallback>();
if (!m_Clients.ContainsKey(sessionID))
{
Console.WriteLine("Client '{0} logged in.", sessionID);
//add new ClientContainer that stores the client callback object and sets IsActive to false
m_Clients.TryAdd(sessionID, new ClientContainer(client, false));
}
else
{
var msg = string.Format("A client with the token '{0}' has already logged in!", sessionID);
Console.WriteLine(msg);
throw new FaultException(msg);
}
}
public ClientContainer(IStockCallback clientCallBack, bool isActive)
{
this.ClientCallback = clientCallBack;
this.IsActive = isActive;
}
public bool IsActive; //Indicates if the given client is set to receive callback messages
public ClientContainer()
{
this.ClientCallback = default;
this.IsActive = default;
}
public ClientContainer(IStockCallback clientCallback, bool isActive)
{
ClientCallback = clientCallback;
IsActive = isActive;
}
