1 | import JsHistogram from "./JsHistogram";
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2 | import { PackedArray } from "./packedarray/PackedArray";
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3 | /**
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4 | * <h3>A High Dynamic Range (HDR) Histogram that uses a packed internal representation</h3>
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5 | * <p>
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6 | * {@link PackedHistogram} supports the recording and analyzing sampled data value counts across a configurable
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7 | * integer value range with configurable value precision within the range. Value precision is expressed as the
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8 | * number of significant digits in the value recording, and provides control over value quantization behavior
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9 | * across the value range and the subsequent value resolution at any given level.
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10 | * <p>
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11 | * {@link PackedHistogram} tracks value counts in a packed internal representation optimized
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12 | * for typical histogram recoded values are sparse in the value range and tend to be incremented in small unit counts.
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13 | * This packed representation tends to require significantly smaller amounts of stoarge when compared to unpacked
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14 | * representations, but can incur additional recording cost due to resizing and repacking operations that may
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15 | * occur as previously unrecorded values are encountered.
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16 | * <p>
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17 | * For example, a {@link PackedHistogram} could be configured to track the counts of observed integer values between 0 and
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18 | * 3,600,000,000,000 while maintaining a value precision of 3 significant digits across that range. Value quantization
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19 | * within the range will thus be no larger than 1/1,000th (or 0.1%) of any value. This example Histogram could
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20 | * be used to track and analyze the counts of observed response times ranging between 1 nanosecond and 1 hour
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21 | * in magnitude, while maintaining a value resolution of 1 microsecond up to 1 millisecond, a resolution of
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22 | * 1 millisecond (or better) up to one second, and a resolution of 1 second (or better) up to 1,000 seconds. At its
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23 | * maximum tracked value (1 hour), it would still maintain a resolution of 3.6 seconds (or better).
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24 | * <p>
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25 | * Auto-resizing: When constructed with no specified value range range (or when auto-resize is turned on with {@link
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26 | * Histogram#setAutoResize}) a {@link PackedHistogram} will auto-resize its dynamic range to include recorded values as
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27 | * they are encountered. Note that recording calls that cause auto-resizing may take longer to execute, as resizing
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28 | * incurs allocation and copying of internal data structures.
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29 | * <p>
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30 | */
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31 | declare class PackedHistogram extends JsHistogram {
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32 | packedCounts: PackedArray;
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33 | constructor(lowestDiscernibleValue: number, highestTrackableValue: number, numberOfSignificantValueDigits: number);
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34 | clearCounts(): void;
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35 | incrementCountAtIndex(index: number): void;
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36 | addToCountAtIndex(index: number, value: number): void;
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37 | setCountAtIndex(index: number, value: number): void;
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38 | resize(newHighestTrackableValue: number): void;
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39 | getCountAtIndex(index: number): number;
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40 | protected _getEstimatedFootprintInBytes(): number;
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41 | copyCorrectedForCoordinatedOmission(expectedIntervalBetweenValueSamples: number): PackedHistogram;
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42 | toString(): string;
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43 | }
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44 | export default PackedHistogram;
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