public static TimeSpan CalculateBackoffDuration()

in src/Microsoft.Extensions.Configuration.AzureAppConfiguration/Extensions/TimeSpanExtensions.cs [74:107]

• 26 lines of code
• 7 McCabe index (conditional complexity)

        public static TimeSpan CalculateBackoffDuration(this TimeSpan minDuration, TimeSpan maxDuration, int attempts)
        {
            if (minDuration <= TimeSpan.Zero)
            {
                throw new ArgumentOutOfRangeException(nameof(minDuration), minDuration, "The minimum backoff time should not be equal to or less than 0.");
            }

            if (maxDuration < minDuration)
            {
                throw new ArgumentOutOfRangeException(nameof(maxDuration), maxDuration, "The maximum backoff time should not be less than the minimum backoff time.");
            }

            if (attempts < 1)
            {
                throw new ArgumentOutOfRangeException(nameof(attempts), attempts, "The number of attempts should not be less than 1.");
            }

            if (attempts == 1)
            {
                return minDuration;
            }

            //
            // IMPORTANT: This can overflow
            double calculatedMilliseconds = Math.Max(1, minDuration.TotalMilliseconds) * (1L << Math.Min(attempts - 1, SafeShiftLimit));

            if (calculatedMilliseconds > maxDuration.TotalMilliseconds ||
                    calculatedMilliseconds <= 0 /*overflow*/)
            {
                calculatedMilliseconds = maxDuration.TotalMilliseconds;
            }

            return TimeSpan.FromMilliseconds(calculatedMilliseconds).Jitter(JitterRatio);
        }