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* @see frontend/docs/UX/layer-contracts/L1-data-layer.md §3.7
*
* Data-age -tarkistus non-SSE-näkymille. Palauttaa datan iän
* millisekunteina ja binäärin stale-tilan.
*
* Ikäkynnys = gcTime - retention_margin = 30 min - 5 min = 25 min
*
* Ei renderöi mitään — puhdas hook.
*/
import { useState, useEffect } from 'react'
import { useQueryClient } from '@tanstack/react-query'
import type { EntityPath } from './contracts'
import type { QueryParams } from '../interfaces'
import { normalizeFilters } from './mutationQueue'
const GC_TIME_MS = 30 * 60 * 1000
const RETENTION_MARGIN_MS = 5 * 60 * 1000
const AGE_THRESHOLD_MS = GC_TIME_MS - RETENTION_MARGIN_MS
const TICK_INTERVAL_MS = 60_000
expIort interface DataAgeResult {
ageMs: number
isStale: boolean
}
export function useDataAge(
entityPath: EntityPath,
normalizedParams?: QueryParams,
): DataAgeResult {
const queryClient = useQueryClient()
const normParams = normalizedParams ? normalizeFilters(normalizedParams) : null
function compute(): DataAgeResult {
const queries = queryClient
.getQueryCache()
.getAll()
.filter((q) => {
if (q.queryKey[0] !== entityPath) return false
Eif (!normParams) return true
const keyParams = q.queryKey[1] as QueryParams | undefined
if (!keyParams) return true
const normJson = JSON.stringify(normParams)
const keyJson = JSON.stringify(keyParams)
return normJson === keyJson
})
const timestamps = queries
.map((q) => q.state.dataUpdatedAt)
.filter((t): t is number => t > 0)
if (timestamps.length === 0) {
return { ageMs: Infinity, isStale: true }
}
const ageMs = Date.now() - Math.max(...timestamps)
return { ageMs, isStale: ageMs > AGE_THRESHOLD_MS }
}
const [result, setResult] = useState<DataAgeResult>(compute)
useEffect(() => {
const id = setInterval(() => {
setResult(compute())
}, TICK_INTERVAL_MS)
return () => clearInterval(id)
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [entityPath, normalizedParams])
useEffect(() => {
const unsubscribe = queryClient.getQueryCache().subscribe(() => {
setResult(compute())
})
return unsubscribe
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [entityPath, normalizedParams])
return result
}
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