Bert.RateLimiters.StepDownTokenBucket.UpdateTokens C# (CSharp) Method

        protected override void UpdateTokens()
        {
            var currentTime = SystemTime.UtcNow.Ticks;

            if (currentTime >= nextRefillTime)
            {
                //set tokens to max
                tokens = bucketTokenCapacity;

                //compute next refill time
                nextRefillTime = currentTime + ticksRefillInterval;
                return;
            }

            //calculate max tokens possible till the end
            var timeToNextRefill = nextRefillTime - currentTime;
            var stepsToNextRefill = timeToNextRefill/ticksStepInterval;

            var maxPossibleTokens = stepsToNextRefill*stepTokens;

            if ((timeToNextRefill%ticksStepInterval) > 0) maxPossibleTokens += stepTokens;
            if (maxPossibleTokens < tokens) tokens = maxPossibleTokens;
        }