/// <summary>
/// Initializes the <see cref="SlidingWindowRateLimiter"/>.
/// </summary>
/// <param name="options">Options to specify the behavior of the <see cref="SlidingWindowRateLimiter"/>.</param>
public SlidingWindowRateLimiter(SlidingWindowRateLimiterOptions options)
{
_options = options ?? throw new ArgumentNullException(nameof(options));
_requestCount = options.PermitLimit;
// _requestsPerSegment holds the no. of acquired requests in each window segment
_requestsPerSegment = new int[options.SegmentsPerWindow];
_currentSegmentIndex = 0;
_idleSince = _lastReplenishmentTick = Stopwatch.GetTimestamp();
if (_options.AutoReplenishment)
{
_renewTimer = new Timer(Replenish, this, ReplenishmentPeriod, ReplenishmentPeriod);
}
}
/// <summary>
/// Initializes the <see cref="SlidingWindowRateLimiter"/>.
/// </summary>
/// <param name="options">Options to specify the behavior of the <see cref="SlidingWindowRateLimiter"/>.</param>
public SlidingWindowRateLimiter(SlidingWindowRateLimiterOptions options)
{
if (options is null)
{
throw new ArgumentNullException(nameof(options));
}
if (options.PermitLimit <= 0 || options.SegmentsPerWindow <= 0)
{
throw new ArgumentException($"Both {nameof(options.PermitLimit)} and {nameof(options.SegmentsPerWindow)} must be set to values greater than 0.", nameof(options));
}
if (options.QueueLimit < 0)
{
throw new ArgumentException($"{nameof(options.QueueLimit)} must be set to a value greater than or equal to 0.", nameof(options));
}
if (options.Window < TimeSpan.Zero)
{
throw new ArgumentException($"{nameof(options.Window)} must be set to a value greater than or equal to TimeSpan.Zero.", nameof(options));
}
_options = new SlidingWindowRateLimiterOptions
{
PermitLimit = options.PermitLimit,
QueueProcessingOrder = options.QueueProcessingOrder,
QueueLimit = options.QueueLimit,
Window = options.Window,
SegmentsPerWindow = options.SegmentsPerWindow,
AutoReplenishment = options.AutoReplenishment
};
_requestCount = options.PermitLimit;
// _requestsPerSegment holds the no. of acquired requests in each window segment
_requestsPerSegment = new int[options.SegmentsPerWindow];
_currentSegmentIndex = 0;
_idleSince = _lastReplenishmentTick = Stopwatch.GetTimestamp();
if (_options.AutoReplenishment)
{
_renewTimer = new Timer(Replenish, this, ReplenishmentPeriod, ReplenishmentPeriod);
}
}