public async Task <ImageDetectorState> CheckStateAsync()
{
// Don't retry anything if our detector is broken.
if (State == ImageDetectorState.Broken)
{
return(State);
}
// Don't do anything unless we're past our imposed delay
if (DateTime.Now < mStateLastChecked + mStateCheckDelay)
{
return(State);
}
Log($"Checking state for {this.GetType()}");
mStateLastChecked = DateTime.Now;
try
{
mState = await CheckStateAsyncCore();
}
catch (Exception ex)
{
Log($"Exception occured while detecting state", LogLevel.Error, ex);
mState = ImageDetectorState.Broken;
}
if (State == ImageDetectorState.Good)
{
mStateCheckDelay = TimeSpan.Zero;
}
else
{
var currentDelay = Math.Max(mStateCheckDelay.TotalSeconds, InitialDelay.TotalSeconds);
var newDelay = Math.Min(currentDelay * 2, MaxStateCheckDelay.TotalSeconds);
mStateCheckDelay = TimeSpan.FromSeconds(newDelay);
}
if (State == ImageDetectorState.Good)
{
Log($"State of {this.GetType()} is good");
}
else
{
Log($"Bad state for {this.GetType()}: {State}", LogLevel.Warning);
}
return(State);
}
/// <summary>
/// Create the exception
/// </summary>
/// <param name="state">The state the detector has gone into</param>
public ImageDetectionException(ImageDetectorState state) : base($"Detector in bad state ({state})")
{
mState = state;
}
