private static async Task <Tuple <T, DataRetrievalMessage> > CloudOrLocal <T>(Func <Task <T> > cloudCallback, Func <Task <T> > localCallback, DataRetrievalOptions options, params Type[] dontCatch)
{
T result = default(T);
bool attempted = false;
bool successful = false;
bool fallbackAttempted = false;
bool fallbackSuccessful = false;
while (!attempted || (attempted && !successful && options.AllowFallback && !fallbackAttempted))
{
Action <bool> setSuccessful = (s) =>
{
if (fallbackAttempted)
{
fallbackSuccessful = s;
}
else
{
successful = s;
}
};
try
{
if (attempted)
{
fallbackAttempted = true;
}
else
{
attempted = true;
}
if (((options.PreferredSource == Cloud) ^ fallbackAttempted) && BandwidthManager.EffectiveBandwidthOptions == BandwidthOptions.None)
{
setSuccessful(false);
}
else
{
result = await(((options.PreferredSource == Cloud) ^ fallbackAttempted) ? cloudCallback() : localCallback());
setSuccessful(result != null);
}
}
catch (Exception ex) when(!dontCatch.Contains(ex.GetType()))
{
setSuccessful(false);
}
}
return(new Tuple <T, DataRetrievalMessage>(result, new DataRetrievalMessage()
{
AttemptedSource = options.PreferredSource, AttemptSucceeded = successful, FallbackAttempted = fallbackAttempted, FallbackSucceeded = fallbackSuccessful
}));
}
public static async Task <Tuple <BusRoute[], DataRetrievalMessage> > GetBusRoutesForAgency(string agencyId, DataRetrievalOptions options, CancellationToken cancellationToken)
{
return(await CloudOrLocal(() => ApiLayer.GetBusRoutesForAgency(agencyId, cancellationToken), () => FileManager.GetBusRoutesForAgencyFromCache(agencyId), options, typeof(OperationCanceledException)));
}
public static async Task <Tuple <TransitAgency[], DataRetrievalMessage> > GetTransitAgencies(DataRetrievalOptions options, CancellationToken cancellationToken)
{
return(await CloudOrLocal(() => ApiLayer.GetTransitAgencies(cancellationToken), () => FileManager.GetAgenciesFromCache(), options, typeof(OperationCanceledException)));
}
public static async Task <Tuple <Tuple <BusStop[], string[]>, DataRetrievalMessage> > GetStopsAndShapesForRoute(string routeId, DataRetrievalOptions options, CancellationToken cancellationToken)
{
return(await CloudOrLocal(() => ApiLayer.GetStopsAndShapesForRoute(routeId, cancellationToken), () => FileManager.GetStopsAndShapesForRouteFromCache(routeId), options, typeof(OperationCanceledException)));
}
public static async Task <Tuple <WeekSchedule, DataRetrievalMessage> > GetScheduleForStop(string id, DataRetrievalOptions options, CancellationToken cancellationToken)
{
return(await CloudOrLocal(() => ApiLayer.GetScheduleForStop(id, cancellationToken), () => FileManager.LoadSchedule(id), options, typeof(OperationCanceledException)));
}
public static async Task <Tuple <RealtimeArrival[], DataRetrievalMessage> > GetArrivals(string stopId, DataRetrievalOptions options, CancellationToken cancellationToken)
{
return(await CloudOrLocal(
() => ApiLayer.GetBusArrivals(stopId, cancellationToken)
,
() => FileManager.GetScheduledArrivals(stopId)
,
options,
typeof(OperationCanceledException)
));
}
