/// <summary>
/// Used to centralize GUI updates instead of relying on external triggers.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
/// <remarks>
/// </remarks>
void myTimer_Tick(object sender, EventArgs e)
{
var timeOfUpdate = DateTime.Now;
// dequeue all product updates
MessageFeed.Message message = null;
while (this.myPendingMessages.TryDequeue(out message))
{
if (this.cachedPriceData.ContainsKey(message.GetIDKey()) == false)
{
InsertNewPriceSorted(message);
}
this.cachedPriceData[message.GetIDKey()].UpdateWith(message, timeOfUpdate);
List <Double> additionalPricesToAdd = this.priceWindowTracker.CheckMessage(message);
if (additionalPricesToAdd.Count > 0)
{
foreach (double newPrice in additionalPricesToAdd)
{
var newMessage = new MessageFeed.Message(
MessageFeed.Message.MessageTypeEnum.PRICE,
message.Symbol,
MessageFeed.Message.ActionEnum.ADD,
MessageFeed.Message.BidAskEnum.BID,
newPrice,
0
);
InsertNewPriceSorted(newMessage);
}
}
}
// Loop over all products to reset any data-changed times
// **NOTE** This has O(n) complexity, which if that was undesirable... it could be restructured
// to store all change times, objects, and properties in a queue where it would merely
// process any that have expired and whose color must be changed back. But that is a
// moderately complex solution for an evaluation project...
foreach (var displayedProduct in this.displayedProducts)
{
displayedProduct.ClearChangedTimes(timeOfUpdate);
}
}
private void InsertNewPriceSorted(MessageFeed.Message message)
{
var newDisplayedPrice = new DisplayedProduct(message.Symbol, message.Price);
this.cachedPriceData[message.GetIDKey()] = newDisplayedPrice;
// Sequential search to find correct location to add
for (int index = 0; index < displayedProducts.Count; index++)
{
if ((newDisplayedPrice.Symbol.CompareTo(this.displayedProducts[index].Symbol) < 0) ||
(newDisplayedPrice.Symbol == this.displayedProducts[index].Symbol && this.displayedProducts[index].Price < newDisplayedPrice.Price))
{
this.displayedProducts.Insert(index, newDisplayedPrice);
return;
}
}
// To get here, it must be sorted after all products
this.displayedProducts.Add(newDisplayedPrice);
}
