public bool PassFilter(StationYear stationYear)
{
GetObservable();
if (_task.IsCompleted)
{
DateTime now = DateTime.Now;
if (_task.Result.LastUpdated.HasValue)
{
if (_task.Result.LastUpdated.Value.Year < stationYear.Year)
{
return(true);
}
}
else
{
if (stationYear.Year == now.Year)
{
return(true);
}
}
return(_task.Result.StationYearBloom.ContainsKey(stationYear));
}
return(true);
}
private Tuple <StationYear, int> ParseLine(string line)
{
if (!line.StartsWith("\"") || !line.EndsWith("\""))
{
throw new NotSupportedException("station inventory csv bad");
}
line = line.Substring(1, line.Length - 2);
string[] lineElements = line.Split(new[] { "\",\"" }, StringSplitOptions.None);
if (lineElements.Length != 15)
{
throw new NotSupportedException("station inventory csv bad");
}
var stationYear = new StationYear
{
StationIdentifier = new StationIdentifier {
UsafId = int.Parse(lineElements[0]), WbanId = int.Parse(lineElements[1])
},
Year = int.Parse(lineElements[2])
};
int count = 0;
for (int i = 3; i < 15; i++)
{
count += int.Parse(lineElements[i]);
}
return(new Tuple <StationYear, int>(stationYear, count));
}
private Task <WeatherCollection> GetObservable(StationYear stationYear, int priority)
{
Task <WeatherCollection> retval;
lock (_collectionLock)
{
StationYearRequest stationYearRequest;
TaskCompletionSource <WeatherCollection> weatherCollection;
if (_cache.TryGetValue(stationYear, out weatherCollection))
{
retval = weatherCollection.Task;
if (retval.IsCompleted && retval.Result.NeedsToRevalidate())
{
stationYearRequest = new StationYearRequest();
stationYearRequest.Priority = priority;
stationYearRequest.RequestTime = DateTime.Now;
stationYearRequest.StationYear = stationYear;
stationYearRequest.LastRun = retval.Result;
var subject = new TaskCompletionSource <WeatherCollection>();
_cache[stationYear] = subject;
_queue.Add(stationYearRequest);
_queueIndex[stationYear] = stationYearRequest;
retval = subject.Task;
}
else
{
if (_queueIndex.TryGetValue(stationYear, out stationYearRequest) &&
stationYearRequest.Priority > priority)
{
_queue.Remove(stationYearRequest);
stationYearRequest.Priority = priority;
_queue.Add(stationYearRequest);
_queueIndex[stationYear] = stationYearRequest;
}
}
}
else
{
stationYearRequest = new StationYearRequest();
stationYearRequest.Priority = priority;
stationYearRequest.RequestTime = DateTime.Now;
stationYearRequest.StationYear = stationYear;
var subject = new TaskCompletionSource <WeatherCollection>();
_cache[stationYear] = subject;
_queue.Add(stationYearRequest);
_queueIndex[stationYear] = stationYearRequest;
retval = subject.Task;
}
}
_readyEvent.Set();
return(retval);
}
public void Prefetch(StationYear stationYear, int priority)
{
GetObservable(stationYear, priority);
}
public WeatherCollection Get(StationYear stationYear)
{
return(GetObservable(stationYear, -1).Result);
}
