133 lines
3.5 KiB
JavaScript
133 lines
3.5 KiB
JavaScript
// Derived from Chromium WebRTC Internals Dashboard - see Acknowledgements for full license details
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// The maximum number of data points buffered for each stats. Old data points
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// will be shifted out when the buffer is full.
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export const MAX_STATS_DATA_POINT_BUFFER_SIZE = 1000;
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/**
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* A TimelineDataSeries collects an ordered series of (time, value) pairs,
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* and converts them to graph points. It also keeps track of its color and
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* current visibility state.
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* It keeps MAX_STATS_DATA_POINT_BUFFER_SIZE data points at most. Old data
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* points will be dropped when it reaches this size.
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*/
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export class TimelineDataSeries {
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constructor(statsType) {
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// List of DataPoints in chronological order.
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this.dataPoints_ = [];
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// Default color. Should always be overridden prior to display.
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this.color_ = 'red';
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// Whether or not the data series should be drawn.
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this.isVisible_ = true;
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this.cacheStartTime_ = null;
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this.cacheStepSize_ = 0;
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this.cacheValues_ = [];
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this.statsType_ = statsType;
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}
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/**
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* @override
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*/
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toJSON() {
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if (this.dataPoints_.length < 1) {
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return {};
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}
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const values = [];
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for (let i = 0; i < this.dataPoints_.length; ++i) {
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values.push(this.dataPoints_[i].value);
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}
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return {
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startTime: this.dataPoints_[0].time,
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endTime: this.dataPoints_[this.dataPoints_.length - 1].time,
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statsType: this.statsType_,
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values: JSON.stringify(values),
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};
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}
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/**
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* Adds a DataPoint to |this| with the specified time and value.
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* DataPoints are assumed to be received in chronological order.
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*/
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addPoint(timeTicks, value) {
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const time = new Date(timeTicks);
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this.dataPoints_.push(new DataPoint(time, value));
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if (this.dataPoints_.length > MAX_STATS_DATA_POINT_BUFFER_SIZE) {
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this.dataPoints_.shift();
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}
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}
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isVisible() {
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return this.isVisible_;
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}
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show(isVisible) {
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this.isVisible_ = isVisible;
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}
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getColor() {
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return this.color_;
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}
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setColor(color) {
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this.color_ = color;
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}
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getCount() {
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return this.dataPoints_.length;
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}
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/**
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* Returns a list containing the values of the data series at |count|
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* points, starting at |startTime|, and |stepSize| milliseconds apart.
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* Caches values, so showing/hiding individual data series is fast.
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*/
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getValues(startTime, stepSize, count) {
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// Use cached values, if we can.
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if (this.cacheStartTime_ === startTime &&
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this.cacheStepSize_ === stepSize &&
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this.cacheValues_.length === count) {
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return this.cacheValues_;
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}
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// Do all the work.
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this.cacheValues_ = this.getValuesInternal_(startTime, stepSize, count);
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this.cacheStartTime_ = startTime;
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this.cacheStepSize_ = stepSize;
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return this.cacheValues_;
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}
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/**
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* Returns the cached |values| in the specified time period.
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*/
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getValuesInternal_(startTime, stepSize, count) {
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const values = [];
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let nextPoint = 0;
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let currentValue = 0;
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let time = startTime;
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for (let i = 0; i < count; ++i) {
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while (nextPoint < this.dataPoints_.length &&
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this.dataPoints_[nextPoint].time < time) {
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currentValue = this.dataPoints_[nextPoint].value;
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++nextPoint;
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}
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values[i] = currentValue;
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time += stepSize;
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}
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return values;
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}
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}
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/**
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* A single point in a data series. Each point has a time, in the form of
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* milliseconds since the Unix epoch, and a numeric value.
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*/
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class DataPoint {
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constructor(time, value) {
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this.time = time;
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this.value = value;
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}
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}
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