public List <DailyPrice> GetPrices()
{
_logger.Information("Initializing price retriever...");
_retrieved.Clear();
// this AutoResetEvent is 'shared' by the calling method and the data retrieval method
// and is used to indicate when all available SecurityInfo objects have been processed
var jobDone = new AutoResetEvent(false);
var interval = Convert.ToInt32(60000 / _config.CallsPerMinute);
_currentRetrieval = CurrentRetrieval.Prices;
// this creates the timer and starts it running
_timer = new Timer(ProcessNextSymbol, jobDone, 0, interval);
// wait until the processing is done
jobDone.WaitOne();
_logger.Information("Price retrieval complete");
return(_retrieved.Select(kvp => kvp.Value)
.ToList());
}
public void ProcessNextSymbol(object?stateInfo)
{
// wrap the call to the actual processing method in a monitor to
// prevent multiple simultaneous accesses to the DbContext object
if (Monitor.TryEnter(_lockObject))
{
try
{
// check to ensure we were given the AutoResetEvent we're expecting
var jobDone = stateInfo as AutoResetEvent;
if (jobDone == null)
{
_logger.Error($"Argument is not a {nameof( AutoResetEvent )}");
}
else
{
switch (_currentRetrieval)
{
case CurrentRetrieval.Prices:
RetrievePriceData(jobDone);
_currentRetrieval = CurrentRetrieval.Name;
break;
case CurrentRetrieval.Name:
RetrieveSymbolInfo(jobDone);
_currentRetrieval = CurrentRetrieval.Prices;
_index++;
break;
}
if (_index >= _config.Securities.Count)
{
jobDone.Set();
}
}
}
finally
{
Monitor.Exit(_lockObject);
}
}
}
