public override void Add(TIn item)
{
var oldStat = GetGroup(item);
var oldValue = Tuple.Create(oldStat.Value, grouper(item));
if (sortedGroups.Contains(oldValue))
{
sortedGroups.Remove(oldValue);
}
base.Add(item);
}
private void TryUpdate(T item)
{
lock (reportLock)
{
var newFeature = featureSelector(item);
if (features.ContainsKey(item))
{
var oldFeature = features[item];
if (oldFeature.Equals(newFeature))
{
return;
}
itemSet.Remove(Tuple.Create(oldFeature, item));
}
features[item] = newFeature;
itemSet.Add(Tuple.Create(newFeature, item));
}
}
