void BeginGetQuotes(HashSet <Security> toFetch)
{
if (_services.Count == 0 || toFetch.Count == 0)
{
return;
}
UiDispatcher.BeginInvoke(new Action(() =>
{
OutputPane output = (OutputPane)provider.GetService(typeof(OutputPane));
output.Clear();
output.AppendHeading(Walkabout.Properties.Resources.StockQuoteCaption);
}));
List <string> batch = new List <string>();
foreach (Security s in toFetch)
{
if (string.IsNullOrEmpty(s.Symbol))
{
continue; // skip it.
}
batch.Add(s.Symbol);
}
bool foundService = false;
IStockQuoteService service = GetHistoryService();
HistoryDownloader downloader = GetDownloader(service);
if (service != null)
{
downloader.BeginFetchHistory(batch);
foundService = true;
}
service = GetQuoteService();
if (service != null)
{
foundService = true;
if (service.SupportsBatchQuotes)
{
service.BeginFetchQuotes(batch);
}
else
{
foreach (var item in batch)
{
service.BeginFetchQuote(item);
}
}
}
if (!foundService)
{
AddError(Walkabout.Properties.Resources.ConfigureStockQuoteService);
UiDispatcher.BeginInvoke(new Action(UpdateUI));
}
}
private HistoryDownloader GetDownloader(IStockQuoteService service)
{
if (_downloader == null)
{
_downloader = new HistoryDownloader(service, this._downloadLog);
_downloader.Error += OnDownloadError;
_downloader.HistoryAvailable += OnHistoryAvailable;
}
return(_downloader);
}