113 lines
5.5 KiB
TypeScript
113 lines
5.5 KiB
TypeScript
|
import Histogram from "./Histogram";
|
||
|
import { BuildRequest } from "./HistogramBuilder";
|
||
|
/**
|
||
|
* Records integer values, and provides stable interval {@link Histogram} samples from
|
||
|
* live recorded data without interrupting or stalling active recording of values. Each interval
|
||
|
* histogram provided contains all value counts accumulated since the previous interval histogram
|
||
|
* was taken.
|
||
|
* <p>
|
||
|
* This pattern is commonly used in logging interval histogram information while recording is ongoing.
|
||
|
* <p>
|
||
|
* {@link Recorder} supports concurrent
|
||
|
* {@link Recorder#recordValue} or
|
||
|
* {@link Recorder#recordValueWithExpectedInterval} calls.
|
||
|
*
|
||
|
*/
|
||
|
declare class Recorder {
|
||
|
private histogramBuildRequest;
|
||
|
private clock;
|
||
|
static idGenerator: number;
|
||
|
private activeHistogram;
|
||
|
private inactiveHistogram;
|
||
|
/**
|
||
|
* Construct an auto-resizing {@link Recorder} with a lowest discernible value of
|
||
|
* 1 and an auto-adjusting highestTrackableValue. Can auto-resize up to track values up to Number.MAX_SAFE_INTEGER.
|
||
|
*
|
||
|
* @param histogramBuildRequest parameters used to build histograms while using this recorder.
|
||
|
* @param clock (for testing purpose) an action that give current time in ms since 1970
|
||
|
*/
|
||
|
constructor(histogramBuildRequest?: BuildRequest, clock?: () => number);
|
||
|
/**
|
||
|
* Record a value in the histogram
|
||
|
*
|
||
|
* @param value The value to be recorded
|
||
|
* @throws may throw Error if value is exceeds highestTrackableValue
|
||
|
*/
|
||
|
recordValue(value: number): void;
|
||
|
/**
|
||
|
* Record a value in the histogram (adding to the value's current count)
|
||
|
*
|
||
|
* @param value The value to be recorded
|
||
|
* @param count The number of occurrences of this value to record
|
||
|
* @throws ArrayIndexOutOfBoundsException (may throw) if value is exceeds highestTrackableValue
|
||
|
*/
|
||
|
recordValueWithCount(value: number, count: number): void;
|
||
|
/**
|
||
|
* Record a value
|
||
|
* <p>
|
||
|
* To compensate for the loss of sampled values when a recorded value is larger than the expected
|
||
|
* interval between value samples, Histogram will auto-generate an additional series of decreasingly-smaller
|
||
|
* (down to the expectedIntervalBetweenValueSamples) value records.
|
||
|
* <p>
|
||
|
* See related notes {@link Histogram#recordValueWithExpectedInterval(long, long)}
|
||
|
* for more explanations about coordinated omission and expected interval correction.
|
||
|
* *
|
||
|
* @param value The value to record
|
||
|
* @param expectedIntervalBetweenValueSamples If expectedIntervalBetweenValueSamples is larger than 0, add
|
||
|
* auto-generated value records as appropriate if value is larger
|
||
|
* than expectedIntervalBetweenValueSamples
|
||
|
* @throws ArrayIndexOutOfBoundsException (may throw) if value is exceeds highestTrackableValue
|
||
|
*/
|
||
|
recordValueWithExpectedInterval(value: number, expectedIntervalBetweenValueSamples: number): void;
|
||
|
/**
|
||
|
* Get an interval histogram, which will include a stable, consistent view of all value counts
|
||
|
* accumulated since the last interval histogram was taken.
|
||
|
* <p>
|
||
|
* {@link Recorder#getIntervalHistogram(Histogram histogramToRecycle)
|
||
|
* getIntervalHistogram(histogramToRecycle)}
|
||
|
* accepts a previously returned interval histogram that can be recycled internally to avoid allocation
|
||
|
* and content copying operations, and is therefore significantly more efficient for repeated use than
|
||
|
* {@link Recorder#getIntervalHistogram()} and
|
||
|
* {@link Recorder#getIntervalHistogramInto getIntervalHistogramInto()}. The provided
|
||
|
* {@code histogramToRecycle} must
|
||
|
* be either be null or an interval histogram returned by a previous call to
|
||
|
* {@link Recorder#getIntervalHistogram(Histogram histogramToRecycle)
|
||
|
* getIntervalHistogram(histogramToRecycle)} or
|
||
|
* {@link Recorder#getIntervalHistogram()}.
|
||
|
* <p>
|
||
|
* NOTE: The caller is responsible for not recycling the same returned interval histogram more than once. If
|
||
|
* the same interval histogram instance is recycled more than once, behavior is undefined.
|
||
|
* <p>
|
||
|
* Calling {@link Recorder#getIntervalHistogram(Histogram histogramToRecycle)
|
||
|
* getIntervalHistogram(histogramToRecycle)} will reset the value counts, and start accumulating value
|
||
|
* counts for the next interval
|
||
|
*
|
||
|
* @param histogramToRecycle a previously returned interval histogram that may be recycled to avoid allocation and
|
||
|
* copy operations.
|
||
|
* @return a histogram containing the value counts accumulated since the last interval histogram was taken.
|
||
|
*/
|
||
|
getIntervalHistogram(histogramToRecycle?: Histogram): Histogram;
|
||
|
/**
|
||
|
* Place a copy of the value counts accumulated since accumulated (since the last interval histogram
|
||
|
* was taken) into {@code targetHistogram}.
|
||
|
*
|
||
|
* Calling {@link Recorder#getIntervalHistogramInto getIntervalHistogramInto()} will reset
|
||
|
* the value counts, and start accumulating value counts for the next interval.
|
||
|
*
|
||
|
* @param targetHistogram the histogram into which the interval histogram's data should be copied
|
||
|
*/
|
||
|
getIntervalHistogramInto(targetHistogram: Histogram): void;
|
||
|
/**
|
||
|
* Reset any value counts accumulated thus far.
|
||
|
*/
|
||
|
reset(): void;
|
||
|
private performIntervalSample;
|
||
|
/**
|
||
|
* Release memory associated to this recorder by destroying
|
||
|
* histograms used under the cover.
|
||
|
* Useful when webassembly histograms are used.
|
||
|
*/
|
||
|
destroy(): void;
|
||
|
}
|
||
|
export default Recorder;
|