/// <summary>
/// Called when a subscription packet comes, update the count of a face.
///
/// if count == Int.MaxValue, it means inf.
/// </summary>
/// <param name="face">The specified face</param>
/// <param name="count">The count of that face, Int32.MaxValue for infinitive</param>
/// <param name="CountInQueue">A count function that will calculate the packets with the same CD in the queue</param>
/// <returns>-1 if no change on that CD, </returns>
public int UpdateFace(IPEndPoint face, int count, Func <int> CountInQueue, out int realFaceCount)
{
// To obsolate count = -1
Trace.Assert(count >= 0);
FaceCounter counter;
if (!Faces.TryGetValue(face, out counter))
{
Faces [face] = counter = new FaceCounter();
}
if (counter.Count == Int32.MaxValue)
{
if (count != Int32.MaxValue)
{
// Modified here, if the subscription changed from inf. to a certain value, use count - N as new count
counter.Count = count - CountInQueue();
}
//else do nothing
}
else
{
if (count == Int32.MaxValue)
{
counter.Count = Int32.MaxValue;
}
else
{
counter.Count += count;
}
}
realFaceCount = counter.Count;
int newMax = CalculateNewMax();
if (newMax == Int32.MaxValue)
{
if (Max == Int32.MaxValue)
{
return(-1);
}
else
{
return(Max = Int32.MaxValue);
}
}
else
{
if (Max == Int32.MaxValue)
{
return(Max = newMax);
}
else
{
int diff = newMax - Max;
Max = newMax;
return(diff);
}
}
}