63 lines
2.4 KiB
TypeScript
63 lines
2.4 KiB
TypeScript
import {List, ListWrapper, StringMap} from 'angular2/src/facade/collection';
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import {bind, Binding, OpaqueToken} from 'angular2/di';
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import {Validator} from '../validator';
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import {Statistic} from '../statistic';
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import {MeasureValues} from '../measure_values';
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/**
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* A validator that checks the regression slope of a specific metric.
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* Waits for the regression slope to be >=0.
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*/
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export class RegressionSlopeValidator extends Validator {
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// TODO(tbosch): use static values when our transpiler supports them
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static get SAMPLE_SIZE(): OpaqueToken { return _SAMPLE_SIZE; }
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// TODO(tbosch): use static values when our transpiler supports them
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static get METRIC(): OpaqueToken { return _METRIC; }
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// TODO(tbosch): use static values when our transpiler supports them
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static get BINDINGS(): List<Binding> { return _BINDINGS; }
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_sampleSize: number;
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_metric: string;
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constructor(sampleSize, metric) {
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super();
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this._sampleSize = sampleSize;
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this._metric = metric;
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}
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describe(): StringMap<string, any> {
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return {'sampleSize': this._sampleSize, 'regressionSlopeMetric': this._metric};
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}
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validate(completeSample: List<MeasureValues>): List<MeasureValues> {
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if (completeSample.length >= this._sampleSize) {
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var latestSample = ListWrapper.slice(completeSample, completeSample.length - this._sampleSize,
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completeSample.length);
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var xValues = [];
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var yValues = [];
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for (var i = 0; i < latestSample.length; i++) {
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// For now, we only use the array index as x value.
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// TODO(tbosch): think about whether we should use time here instead
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ListWrapper.push(xValues, i);
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ListWrapper.push(yValues, latestSample[i].values[this._metric]);
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}
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var regressionSlope = Statistic.calculateRegressionSlope(
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xValues, Statistic.calculateMean(xValues), yValues, Statistic.calculateMean(yValues));
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return regressionSlope >= 0 ? latestSample : null;
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} else {
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return null;
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}
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}
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}
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var _SAMPLE_SIZE = new OpaqueToken('RegressionSlopeValidator.sampleSize');
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var _METRIC = new OpaqueToken('RegressionSlopeValidator.metric');
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var _BINDINGS = [
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bind(RegressionSlopeValidator)
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.toFactory((sampleSize, metric) => new RegressionSlopeValidator(sampleSize, metric),
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[_SAMPLE_SIZE, _METRIC]),
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bind(_SAMPLE_SIZE).toValue(10),
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bind(_METRIC).toValue('scriptTime')
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];
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