public void OnChangeRaiseEvent(StockPriceChangeEvent stockPriceEvt)
{
if (Handler != null)
{
Handler(this, stockPriceEvt);
}
}
/// <summary>
/// Helper method to find out the rowIndex in the grid for a given stock object
/// </summary>
/// <param name="evt">StockPrice Change event object</param>
/// <returns>rowindex as int</returns>
private int FindCompany(StockPriceChangeEvent evt)
{
int rowIndex = -1, index = -1;
TickerSymbols.ToList().ForEach((symbol) =>
{
++index;
if (_cancellationToken.IsCancellationRequested)
{
return;
}
if ((string)stockTickerGrid["Company", index].Value == evt.Company)
{
rowIndex = stockTickerGrid["Company", index].RowIndex;
}
});
return(rowIndex);
}
/// <summary>
/// Core method which starts the ticker by generating random inputs
/// </summary>
public void StartServer()
{
Logger.Instance.Log("Starting the ticker price updater");
for (; ;)
{
//_token.ThrowIfCancellationRequested();
if (_token.IsCancellationRequested)
{
break;
}
var evt = new StockPriceChangeEvent(
StockDataVisualizer.TickerSymbols[new Random().Next(0, StockDataVisualizer.TickerSymbols.Count)],
new Random().Next(1, 700),
new Random().Next(1, 750),
new Random().Next(1, 600),
new Random().Next(1, 650));
//:~ Deliberate attempt to slow down screen refresh interval
Thread.Sleep(150);
ThreadPool.QueueUserWorkItem(Parallellize, evt);
}
}
/// <summary>
/// The Main handler for any StockPriceChangeEvent which causes the List to
/// be updated with new values and also update the grid
/// </summary>
/// <param name="sender">Sender of the event</param>
/// <param name="evt">StockPrice change object</param>
public void UpdateReceived(object sender, StockPriceChangeEvent evt)
{
var stockObj = stocks.Find(x => x.Company.Equals(evt.Company));
var oldBidValue = stockObj.Bid;
var oldAskValue = stockObj.Ask;
var oldBidAskSpread = stockObj.BidAskSpread;
var oldMarketPrice = stockObj.MarketPrice;
stockObj.Bid = evt.BidPrice;
stockObj.Ask = evt.AskPrice;
stockObj.Volume = stockObj.Volume + 1;
//:~ Use Func to calculate Mid Market Price
Func <double, double, double> calculateMidMarketPrice = (bidPrice, askPrice) => (bidPrice + askPrice) / 2.0;
stockObj.MarketPrice = calculateMidMarketPrice(evt.BidPrice, evt.AskPrice);
//:~ Use Func to calculate difference between bid and askPrice difference
Func <double, double, double> calculateBidAskSpread = (bidPrice, askPrice) => (askPrice - bidPrice) / 100.0;
double spread = calculateBidAskSpread(evt.BidPrice, evt.AskPrice);
stockObj.BidAskSpread = spread;
//:~ Use Func to streamline method to determine paint color
Func <double, double, Color> determineColorToPaint = (x, y) => x > y ? Color.Green : Color.Red;
int rowIndex = FindCompany(evt);
//:~ Hate this hack and the *IF*
if (!_cancellationToken.IsCancellationRequested)
{
this.stockTickerGrid["Bid", rowIndex].Style.BackColor = determineColorToPaint(((double)stockObj.Bid), (double)oldBidValue);
this.stockTickerGrid["Ask", rowIndex].Style.BackColor = determineColorToPaint(((double)stockObj.Ask), (double)oldAskValue);
this.stockTickerGrid["BidAskSpread", rowIndex].Style.BackColor = determineColorToPaint(oldBidAskSpread, spread);
this.stockTickerGrid["MarketPrice", rowIndex].Style.BackColor = determineColorToPaint(oldMarketPrice, stockObj.MarketPrice);
}
}
