/// <summary>
/// Returns the number of seconds until request is expected to be satisfied.
/// Calculates the ETA by looking at the average satisfied time, the current running time of
/// requests and the position of this request.
/// </summary>
/// <param name="requestHandler">The request for which we want the ETA.</param>
/// <returns>ETA in seconds.</returns>
public int ETA(LocalRequestHandler requestHandler)
{
double avg = _averageTimePerRequest.TotalSeconds;
int pos = _globalRequests.IndexOf(requestHandler);
if (requestHandler.RequestStatus == RequestHandler.Status.Downloading)
{
// Calculate remaining time
return (int)(avg - Math.Min(requestHandler.TimeRunning().TotalSeconds, avg));
}
else if (requestHandler.RequestStatus == RequestHandler.Status.Pending)
{
// Determine request that is running longest.
TimeSpan max = TimeSpan.Zero;
for (int i = 0; i < _maxInflightRequests && i < _globalRequests.Count; i++)
{
TimeSpan ts;
if ((ts = _globalRequests[i].TimeRunning()) > max)
{
max = ts;
}
}
// Calculate remaining time
return (int)((pos + 1 - _maxInflightRequests) * avg - Math.Min(max.TotalSeconds, avg));
}
else // finished or error
{
return 0;
}
}
