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var units = require('./units');
module.exports = ExponentiallyWeightedMovingAverage;
function ExponentiallyWeightedMovingAverage(timePeriod, tickInterval) {
this._timePeriod = timePeriod || 1 * units.MINUTE;
this._tickInterval = tickInterval || ExponentiallyWeightedMovingAverage.TICK_INTERVAL;
this._alpha = 1 - Math.exp(-this._tickInterval / this._timePeriod);
this._count = 0;
this._rate = 0;
};
ExponentiallyWeightedMovingAverage.TICK_INTERVAL = 5 * units.SECONDS;
ExponentiallyWeightedMovingAverage.prototype.update = function(n) {
this._count += n;
};
ExponentiallyWeightedMovingAverage.prototype.tick = function() {
var instantRate = this._count / this._tickInterval;
this._count = 0;
this._rate += (this._alpha * (instantRate - this._rate));
};
ExponentiallyWeightedMovingAverage.prototype.rate = function(timeUnit) {
return (this._rate || 0) * timeUnit;
};