public static int ChangeSubscribers <T>(this CachedSynchronizedDictionary <T, int> subscribers, T subscriber, int delta)
{
if (subscribers == null)
{
throw new ArgumentNullException("subscribers");
}
lock (subscribers.SyncRoot)
{
var value = subscribers.TryGetValue2(subscriber) ?? 0;
value += delta;
if (value > 0)
{
subscribers[subscriber] = value;
}
else
{
subscribers.Remove(subscriber);
}
return(value);
}
}
public static int ChangeSubscribers <T>(this CachedSynchronizedDictionary <T, int> subscribers, T subscriber, bool isSubscribe)
{
if (subscribers == null)
{
throw new ArgumentNullException(nameof(subscribers));
}
lock (subscribers.SyncRoot)
{
var value = subscribers.TryGetValue2(subscriber) ?? 0;
if (isSubscribe)
{
value++;
}
else
{
if (value > 0)
{
value--;
}
}
if (value > 0)
{
subscribers[subscriber] = value;
}
else
{
subscribers.Remove(subscriber);
}
return(value);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="WeightedIndexSecurity"/>.
/// </summary>
public WeightedIndexSecurity()
{
_weights = new CachedSynchronizedDictionary <SecurityId, decimal>();
}
private static bool TryUnSubscribe <T>(CachedSynchronizedDictionary <T, int> subscribers, T subscriber)
{
return(subscribers.ChangeSubscribers(subscriber, -1) == 0);
}