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Bug 2057561 - Caching derived scatter data (Fix 2) #9750

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Bug 2057561 - Caching derived scatter data (Fix 2) #9750

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808f816
feat: optimize rendering with caching
davidmiculit Aug 3, 2026
5b54333
feat: refactor code logic and introduce O(1) hover lookup
davidmiculit Aug 12, 2026
50e2091
test: clear mock history before simulating the clicks
davidmiculit Aug 12, 2026
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72 changes: 50 additions & 22 deletions ui/perfherder/graphs/GraphsContainer.jsx
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Original file line number Diff line number Diff line change
Expand Up @@ -78,9 +78,6 @@ class GraphsContainer extends React.Component {
timeRange,
selectedDataPoint,
} = this.props;
const _scatterPlotData = flatMap(testData, (item) =>
item.visible ? item.data : [],
);

if (
prevProps.highlightAlerts !== highlightAlerts ||
Expand Down Expand Up @@ -390,6 +387,55 @@ class GraphsContainer extends React.Component {
return data.reduce((max, p) => (p.y > max ? p.y : max), data[0].y);
};

_dataKey = (props) => {
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const testDataSig = (props.testData || [])
.map((t) => `${t.signature_id}:${t.visible}`)
.join(',');

return `${testDataSig}|${props.timeRange?.value}|${props.changelogData?.length}`;
};

_getMemoizedData = () => {
const currentKey = this._dataKey(this.props);

if (currentKey === this._lastKey) {
return {
scatterPlotData: this._scatterCache,
infraAffectedData: this._infraAffectedCache,
};
}

const scatterPlotData = (this.props.testData || []).flatMap((item) =>
item.visible ? item.data : [],
);

let rawInfraData = [];
const markDataPoints = 5;

(this.props.changelogData || []).forEach((data) =>
scatterPlotData.some((dataPoint, index) => {
const affectedData = dataPoint.x > data.date;
if (affectedData) {
rawInfraData.push(
scatterPlotData.slice(index, index + markDataPoints),
);
}
return affectedData;
}),
);

this._scatterCache = scatterPlotData;
this._infraAffectedCache = new Set(
flatMap(rawInfraData).map((item) => item.revision),
);
this._lastKey = currentKey;

return {
scatterPlotData: this._scatterCache,
infraAffectedData: this._infraAffectedCache,
};
};

render() {
const {
testData = [],
Expand All @@ -405,36 +451,18 @@ class GraphsContainer extends React.Component {
const {
highlights,
highlightCommonAlertsData,
scatterPlotData,
zoomDomain,
width,
} = this.state;

let infraAffectedData = [];
const markDataPoints = 5;
const { scatterPlotData, infraAffectedData } = this._getMemoizedData();
const hoverDatum = this.state.hoverId
? scatterPlotData.find((d) => d?.dataPointId === this.state.hoverId)
: null;
const lockedDatum = this.state.lockedId
? scatterPlotData.find((d) => d?.dataPointId === this.state.lockedId)
: null;

changelogData.forEach((data) =>
scatterPlotData.some((dataPoint, index) => {
const affectedData = dataPoint.x > data.date;
if (affectedData) {
infraAffectedData.push(
scatterPlotData.slice(index, index + markDataPoints),
);
}
return affectedData;
}),
);

infraAffectedData = new Set(
flatMap(infraAffectedData).map((item) => item.revision),
);

const yAxisLabel = this.computeYAxisLabel();
const positionedTick = <VictoryLabel dx={-2} />;
const positionedLabel = <VictoryLabel dy={24} />;
Expand Down