public async void AddStationToRefreshingPool(Station station)
{
if (!station.Loaded)
{
var contract = station.Contract;
if (contract != null)
{
if (await contract.RefreshAsync(station).ConfigureAwait(false))
{
if (station.IsUiRefreshNeeded)
{
StationRefreshed?.Invoke(station, EventArgs.Empty);
}
}
if (contract.ImageAvailability)
{
station.IsInRefreshPool = true;
refreshingPool.Add(station);
if (!IsStationWorkerRunning)
{
StartRefreshStationsAsync();
}
}
}
}
}
private async void StartRefreshStationsAsync()
{
IsStationWorkerRunning = true;
while (refreshingPool.Count > 0)
{
await Task.Delay(15000).ConfigureAwait(false);
if (CrossConnectivity.Current.IsConnected)
{
BatchBlock <Station> batchBlock = new BatchBlock <Station>(5);
var actionBlock = new ActionBlock <Station[]>(
async stations =>
{
foreach (var station in stations)
{
if (await station.Contract.RefreshAsync(station))
{
if (station.IsUiRefreshNeeded)
{
StationRefreshed?.Invoke(station, EventArgs.Empty);
}
}
}
},
new ExecutionDataflowBlockOptions
{
MaxDegreeOfParallelism = 5
});
batchBlock.LinkTo(actionBlock, new DataflowLinkOptions {
PropagateCompletion = true
});
foreach (var station in refreshingPool)
{
await batchBlock.SendAsync(station); // wait synchronously for the block to accept.
}
batchBlock.Complete();
actionBlock.Completion.Wait(15000);
}
}
IsStationWorkerRunning = false;
}
