internal static async Task <bool> WaitForDownloadResult(IBaseDownloader downloader)
{
var success = false;
var cs = new CancellationTokenSource();
downloader.Finished += (a, b) =>
{
success = true;
cs.Cancel();
};
downloader.Failed += (a, b) =>
{
success = false;
cs.Cancel();
};
downloader.Start();
try
{
await Task.Delay(Int32.MaxValue, cs.Token);
}
catch { }
return(success);
}
public void ThrottleIfNeeded(IBaseDownloader downloader)
{
int speedLimit = GetCachedSpeedLimit();
if (speedLimit < 1)
{
return;
}
if (lastBytes == 0 || lastTick == 0)
{
lastBytes = downloader.GetDownloaded();
lastTick = Helpers.TickCount();
return;
}
try
{
downloader.Lock.EnterWriteLock();
var maxBytesPerMS = (double)speedLimit * 1024 / 1000;
var now = Helpers.TickCount();
var actualTimeSpent = now - lastTick;
if (actualTimeSpent < 1)
{
return;
}
var bytes = downloader.GetDownloaded();
var diff = bytes - lastBytes;
lastBytes = bytes;
lastTick = now;
var expectedTimeSpent = diff / maxBytesPerMS;
if (actualTimeSpent < expectedTimeSpent)
{
try
{
sleep((int)Math.Ceiling(expectedTimeSpent - actualTimeSpent));
}
catch (Exception ex) { Log.Debug(ex, "Exception while throttling"); }
}
}
finally
{
downloader.Lock.ExitWriteLock();
}
}
