/// <summary>
/// Send a single feed to redis
/// </summary>
/// <param name="feed"></param>
/// <param name="exchange"></param>
/// <returns></returns>
public bool SendFeed(Feed feed, string exchange)
{
ISubscriber sub = connection.GetSubscriber();
string text = Convert.ToBase64String(ObjectSerialization.SerializeToStream(feed).ToArray());
sub.PublishAsync(exchange, text);
return true;
}
/// <summary>
/// Method for notifying all subscribers that feed has arrived.
/// </summary>
/// <param name="symbolId">Id of the symbol for which feed has arrived</param>
/// <param name="fd">Feed</param>
private void Notify(int symbolId, Feed fd)
{
lock (_lockSubscription)
{
if (notifyList.ContainsKey(symbolId))
{
foreach (OnFeedReceived hndl in notifyList[symbolId])
{
try
{
//send a copy
hndl((Feed)fd.Clone());
}
catch
{
//ignore...
}
}
}
}
}
/// <summary>
/// Method for generating fake data
/// </summary>
private void UpdateData()
{
// Method to change the values of all the stocks randomly in a fixed range
List<StockModel.Symbol> symbols = InMemoryObjects.ExchangeSymbolList.SingleOrDefault(x => x.Exchange == Exchange.FAKE_NASDAQ).Symbols;
Feed[] feedsArray = new Feed[symbols.Count];
List<SymbolFeeds> symbolFeeds = new List<SymbolFeeds>();
while (true)
{
Thread.Sleep(updateDurationTime);
Parallel.ForEach(symbols, (symbol) =>
{
SymbolFeeds feeds = new SymbolFeeds();
feeds.SymbolId = symbol.Id;
double changePercent = random.NextDouble() * (Constants.MAX_CHANGE_PERC - Constants.MIN_CHANGE_PERC) + Constants.MIN_CHANGE_PERC;
symbol.DefaultVal = symbol.DefaultVal + symbol.DefaultVal * changePercent / 100;
Feed feed = new Feed();
feed.SymbolId = symbol.Id;
feed.LTP = symbol.DefaultVal;
feed.TimeStamp = Convert.ToInt64((DateTime.Now - epoch).TotalMilliseconds);
if (FeedArrived != null)
FeedArrived((Feed)feed.Clone());
//notify subscribers - later to be changed to only notify if there is any new data
Notify(symbol.Id, feed);
});
}
}
/// <summary>
/// Method for requesting latest data from the yahoo server against a given exchange/symbol
/// </summary>
/// <param name="symbol">Symbol for which data is to be fetched</param>
/// <param name="symbolId">Unique symbol id for the symbol</param>
/// <param name="exchange">Exchange used</param>
/// <returns></returns>
private Feed GetFeed(string symbol, int symbolId, string exchange)
{
string url = string.Format("{0}?q={1}&format={2}&env={3}", baseYFinanceURL,
HttpUtility.UrlPathEncode(string.Format(yql, symbol, exchange)),
HttpUtility.UrlPathEncode(format),
Uri.EscapeDataString(HttpUtility.UrlPathEncode(env))
);
WebRequest request = WebRequest.Create(url);
WebResponse response = request.GetResponse();
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
RootObject rootData = JsonConvert.DeserializeObject<RootObject>(responseFromServer);
Feed fd = new Feed();
fd.SymbolId = symbolId;
fd.Id = symbolId;
fd.High = Convert.ToDouble(string.IsNullOrEmpty(rootData.query.results.quote.DaysHigh) ? "0" : rootData.query.results.quote.DaysHigh);
fd.Low = Convert.ToDouble(string.IsNullOrEmpty(rootData.query.results.quote.DaysLow) ? "0" : rootData.query.results.quote.DaysHigh);
fd.LTP = Convert.ToDouble(string.IsNullOrEmpty(rootData.query.results.quote.LastTradePriceOnly) ? "0" : rootData.query.results.quote.DaysHigh);
fd.Open = Convert.ToDouble(string.IsNullOrEmpty(rootData.query.results.quote.Open) ? "0" : rootData.query.results.quote.DaysHigh);
fd.TimeStamp = Convert.ToInt64((DateTime.Now - epoch).TotalMilliseconds);
return fd;
}
