private static void FillPairCountDic(ProductPair productPair)
{
if (ProductPairCountDic.ContainsKey(productPair))
ProductPairCountDic[productPair]++;
else
ProductPairCountDic[productPair] = 1;
}
public static void AddVisit(string upc1, string upc2)
{
lock (snycLock)
{
ProductPair productPair = new ProductPair() {UPC1 = upc1, UPC2 = upc2};
ProductVisitQueue.Enqueue(productPair);
if (ProductVisitQueue.Count > MAX_QUEUE_LENGTH)
{
ProductPair dequeuedPair = ProductVisitQueue.Dequeue();
ProductPairCountDic[dequeuedPair]--;
if (ProductPairCountDic[dequeuedPair] <= 0)
ProductPairCountDic.Remove(dequeuedPair);
}
FillPairCountDic(productPair);
// for performace reason, use REFRESH_THRESHOLD
if (updateCounter++ > REFRESH_THRESHOLD)
{
updateCounter = 0;
Queue2IO();
}
}
}