99 lines
4.3 KiB
JavaScript
99 lines
4.3 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const HistogramIterationValue_1 = require("./HistogramIterationValue");
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/**
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* Used for iterating through histogram values.
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*/
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class JsHistogramIterator /* implements Iterator<HistogramIterationValue> */ {
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constructor() {
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this.currentIterationValue = new HistogramIterationValue_1.default();
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}
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resetIterator(histogram) {
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this.histogram = histogram;
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this.savedHistogramTotalRawCount = histogram.totalCount;
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this.arrayTotalCount = histogram.totalCount;
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this.currentIndex = 0;
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this.currentValueAtIndex = 0;
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this.nextValueAtIndex = Math.pow(2, histogram.unitMagnitude);
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this.prevValueIteratedTo = 0;
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this.totalCountToPrevIndex = 0;
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this.totalCountToCurrentIndex = 0;
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this.totalValueToCurrentIndex = 0;
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this.countAtThisValue = 0;
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this.freshSubBucket = true;
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this.currentIterationValue.reset();
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}
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/**
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* Returns true if the iteration has more elements. (In other words, returns true if next would return an
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* element rather than throwing an exception.)
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*
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* @return true if the iterator has more elements.
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*/
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hasNext() {
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if (this.histogram.totalCount !== this.savedHistogramTotalRawCount) {
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throw "Concurrent Modification Exception";
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}
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return this.totalCountToCurrentIndex < this.arrayTotalCount;
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}
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/**
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* Returns the next element in the iteration.
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*
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* @return the {@link HistogramIterationValue} associated with the next element in the iteration.
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*/
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next() {
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// Move through the sub buckets and buckets until we hit the next reporting level:
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while (!this.exhaustedSubBuckets()) {
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this.countAtThisValue = this.histogram.getCountAtIndex(this.currentIndex);
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if (this.freshSubBucket) {
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// Don't add unless we've incremented since last bucket...
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this.totalCountToCurrentIndex += this.countAtThisValue;
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this.totalValueToCurrentIndex +=
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this.countAtThisValue *
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this.histogram.highestEquivalentValue(this.currentValueAtIndex);
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this.freshSubBucket = false;
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}
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if (this.reachedIterationLevel()) {
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const valueIteratedTo = this.getValueIteratedTo();
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Object.assign(this.currentIterationValue, {
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valueIteratedTo,
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valueIteratedFrom: this.prevValueIteratedTo,
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countAtValueIteratedTo: this.countAtThisValue,
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countAddedInThisIterationStep: this.totalCountToCurrentIndex - this.totalCountToPrevIndex,
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totalCountToThisValue: this.totalCountToCurrentIndex,
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totalValueToThisValue: this.totalValueToCurrentIndex,
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percentile: (100 * this.totalCountToCurrentIndex) / this.arrayTotalCount,
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percentileLevelIteratedTo: this.getPercentileIteratedTo(),
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});
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this.prevValueIteratedTo = valueIteratedTo;
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this.totalCountToPrevIndex = this.totalCountToCurrentIndex;
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this.incrementIterationLevel();
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if (this.histogram.totalCount !== this.savedHistogramTotalRawCount) {
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throw new Error("Concurrent Modification Exception");
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}
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return this.currentIterationValue;
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}
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this.incrementSubBucket();
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}
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throw new Error("Index Out Of Bounds Exception");
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}
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getPercentileIteratedTo() {
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return (100 * this.totalCountToCurrentIndex) / this.arrayTotalCount;
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}
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getPercentileIteratedFrom() {
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return (100 * this.totalCountToPrevIndex) / this.arrayTotalCount;
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}
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getValueIteratedTo() {
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return this.histogram.highestEquivalentValue(this.currentValueAtIndex);
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}
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exhaustedSubBuckets() {
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return this.currentIndex >= this.histogram.countsArrayLength;
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}
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incrementSubBucket() {
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this.freshSubBucket = true;
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this.currentIndex++;
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this.currentValueAtIndex = this.histogram.valueFromIndex(this.currentIndex);
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this.nextValueAtIndex = this.histogram.valueFromIndex(this.currentIndex + 1);
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}
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}
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exports.default = JsHistogramIterator;
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//# sourceMappingURL=JsHistogramIterator.js.map
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