[6a3a178] | 1 | /*
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| 2 | * This is a AssemblyScript port of the original Java version, which was written by
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| 3 | * Gil Tene as described in
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| 4 | * https://github.com/HdrHistogram/HdrHistogram
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| 5 | * and released to the public domain, as explained at
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| 6 | * http://creativecommons.org/publicdomain/zero/1.0/
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| 7 | */
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| 8 |
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| 9 | import Histogram from "./Histogram";
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| 10 | import HistogramIterationValue from "./HistogramIterationValue";
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| 11 |
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| 12 | /**
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| 13 | * Used for iterating through all recorded histogram values using the finest granularity steps supported by the
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| 14 | * underlying representation. The iteration steps through all non-zero recorded value counts, and terminates when
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| 15 | * all recorded histogram values are exhausted.
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| 16 | */
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| 17 | class RecordedValuesIterator<T, U> {
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| 18 | visitedIndex: i32;
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| 19 | histogram: Histogram<T, U>;
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| 20 | savedHistogramTotalRawCount: u64;
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| 21 | currentIndex: i32;
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| 22 | currentValueAtIndex: u64;
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| 23 | nextValueAtIndex: u64;
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| 24 | prevValueIteratedTo: u64;
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| 25 | totalCountToPrevIndex: u64;
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| 26 | totalCountToCurrentIndex: u64;
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| 27 | totalValueToCurrentIndex: u64;
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| 28 | arrayTotalCount: u64;
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| 29 | countAtThisValue: u64;
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| 30 |
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| 31 | private freshSubBucket: boolean;
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| 32 |
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| 33 | currentIterationValue: HistogramIterationValue = new HistogramIterationValue();
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| 34 |
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| 35 | /**
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| 36 | * @param histogram The histogram this iterator will operate on
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| 37 | */
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| 38 | constructor(histogram: Histogram<T, U>) {
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| 39 | this.doReset(histogram);
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| 40 | }
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| 41 |
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| 42 | /**
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| 43 | * Reset iterator for re-use in a fresh iteration over the same histogram data set.
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| 44 | */
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| 45 | public reset(): void {
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| 46 | this.doReset(this.histogram);
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| 47 | }
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| 48 |
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| 49 | private doReset(histogram: Histogram<T, U>): void {
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| 50 | this.resetIterator(histogram);
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| 51 | this.visitedIndex = -1;
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| 52 | }
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| 53 |
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| 54 | incrementIterationLevel(): void {
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| 55 | this.visitedIndex = this.currentIndex;
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| 56 | }
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| 57 |
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| 58 | reachedIterationLevel(): bool {
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| 59 | const currentCount = this.histogram.getCountAtIndex(this.currentIndex);
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| 60 | return currentCount != 0 && this.visitedIndex !== this.currentIndex;
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| 61 | }
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| 62 |
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| 63 | resetIterator(histogram: Histogram<T, U>): void {
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| 64 | this.histogram = histogram;
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| 65 | this.savedHistogramTotalRawCount = histogram.totalCount;
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| 66 | this.arrayTotalCount = histogram.totalCount;
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| 67 | this.currentIndex = 0;
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| 68 | this.currentValueAtIndex = 0;
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| 69 | this.nextValueAtIndex = 1 << histogram.unitMagnitude;
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| 70 | this.prevValueIteratedTo = 0;
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| 71 | this.totalCountToPrevIndex = 0;
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| 72 | this.totalCountToCurrentIndex = 0;
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| 73 | this.totalValueToCurrentIndex = 0;
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| 74 | this.countAtThisValue = 0;
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| 75 | this.freshSubBucket = true;
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| 76 | this.currentIterationValue.reset();
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| 77 | }
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| 78 |
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| 79 | /**
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| 80 | * Returns true if the iteration has more elements. (In other words, returns true if next would return an
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| 81 | * element rather than throwing an exception.)
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| 82 | *
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| 83 | * @return true if the iterator has more elements.
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| 84 | */
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| 85 | public hasNext(): boolean {
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| 86 | if (this.histogram.totalCount !== this.savedHistogramTotalRawCount) {
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| 87 | throw "Concurrent Modification Exception";
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| 88 | }
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| 89 | return this.totalCountToCurrentIndex < this.arrayTotalCount;
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| 90 | }
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| 91 |
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| 92 | /**
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| 93 | * Returns the next element in the iteration.
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| 94 | *
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| 95 | * @return the {@link HistogramIterationValue} associated with the next element in the iteration.
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| 96 | */
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| 97 | public next(): HistogramIterationValue {
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| 98 | // Move through the sub buckets and buckets until we hit the next reporting level:
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| 99 | while (!this.exhaustedSubBuckets()) {
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| 100 | this.countAtThisValue = this.histogram.getCountAtIndex(this.currentIndex);
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| 101 | if (this.freshSubBucket) {
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| 102 | // Don't add unless we've incremented since last bucket...
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| 103 | this.totalCountToCurrentIndex += this.countAtThisValue;
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| 104 | this.totalValueToCurrentIndex +=
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| 105 | this.countAtThisValue *
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| 106 | this.histogram.highestEquivalentValue(this.currentValueAtIndex);
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| 107 | this.freshSubBucket = false;
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| 108 | }
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| 109 | if (this.reachedIterationLevel()) {
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| 110 | const valueIteratedTo = this.getValueIteratedTo();
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| 111 |
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| 112 | //Object.assign(this.currentIterationValue, {
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| 113 | this.currentIterationValue.valueIteratedTo = valueIteratedTo;
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| 114 | this.currentIterationValue.valueIteratedFrom = this.prevValueIteratedTo;
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| 115 | this.currentIterationValue.countAtValueIteratedTo = this.countAtThisValue;
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| 116 | this.currentIterationValue.countAddedInThisIterationStep =
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| 117 | this.totalCountToCurrentIndex - this.totalCountToPrevIndex;
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| 118 | this.currentIterationValue.totalCountToThisValue = this.totalCountToCurrentIndex;
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| 119 | this.currentIterationValue.totalValueToThisValue = this.totalValueToCurrentIndex;
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| 120 | this.currentIterationValue.percentile =
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| 121 | (<f64>100 * <f64>this.totalCountToCurrentIndex) /
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| 122 | <f64>this.arrayTotalCount;
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| 123 | this.currentIterationValue.percentileLevelIteratedTo = this.getPercentileIteratedTo();
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| 124 | this.prevValueIteratedTo = valueIteratedTo;
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| 125 | this.totalCountToPrevIndex = this.totalCountToCurrentIndex;
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| 126 | this.incrementIterationLevel();
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| 127 | if (this.histogram.totalCount !== this.savedHistogramTotalRawCount) {
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| 128 | throw new Error("Concurrent Modification Exception");
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| 129 | }
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| 130 | return this.currentIterationValue;
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| 131 | }
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| 132 | this.incrementSubBucket();
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| 133 | }
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| 134 | throw new Error("Index Out Of Bounds Exception");
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| 135 | }
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| 136 |
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| 137 | getPercentileIteratedTo(): f64 {
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| 138 | return (
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| 139 | (<f64>100 * <f64>this.totalCountToCurrentIndex) /
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| 140 | <f64>this.arrayTotalCount
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| 141 | );
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| 142 | }
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| 143 |
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| 144 | getPercentileIteratedFrom(): f64 {
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| 145 | return (
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| 146 | (<f64>100 * <f64>this.totalCountToPrevIndex) / <f64>this.arrayTotalCount
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| 147 | );
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| 148 | }
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| 149 |
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| 150 | getValueIteratedTo(): u64 {
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| 151 | return this.histogram.highestEquivalentValue(this.currentValueAtIndex);
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| 152 | }
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| 153 |
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| 154 | private exhaustedSubBuckets(): boolean {
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| 155 | return this.currentIndex >= this.histogram.countsArrayLength;
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| 156 | }
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| 157 |
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| 158 | incrementSubBucket(): void {
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| 159 | this.freshSubBucket = true;
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| 160 | this.currentIndex++;
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| 161 | this.currentValueAtIndex = this.histogram.valueFromIndex(this.currentIndex);
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| 162 | this.nextValueAtIndex = this.histogram.valueFromIndex(
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| 163 | this.currentIndex + 1
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| 164 | );
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| 165 | }
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| 166 | }
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| 167 |
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| 168 | export default RecordedValuesIterator;
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