protected sealed override long ReserveEarliestAvailable(int requiredPermits, long nowMicros)
{
Resync(nowMicros);
var returnValue = _nextFreeTicketMicros;
var storedPermitsToSpend = Math.Min(requiredPermits, _storedPermits);
var freshPermits = requiredPermits - storedPermitsToSpend;
var waitMicros = StoredPermitsToWaitTime(_storedPermits, storedPermitsToSpend)
+ (long)(freshPermits * _stableIntervalMicros);
_nextFreeTicketMicros = LongMath.SaturatedAdd(_nextFreeTicketMicros, waitMicros);
_storedPermits -= storedPermitsToSpend;
return(returnValue);
}