nova28
34 lines
1.2 KiB
TypeScript
34 lines
1.2 KiB
TypeScript
"use client";
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import { useEffect, useRef } from "react";
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/**
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* How often a page with something in flight re-asks. Slow enough that a page
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* left open overnight is not a load problem, fast enough that a run finishing
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* is noticed while the reader is still looking at it.
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*/
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export const LIVE_REFRESH_INTERVAL_MS = 10_000;
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/**
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* Re-run `refresh` on an interval, but only while `active`.
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*
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* Runs finish without anything on these pages asking, so a row that says
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* "Running" keeps saying it until the user reloads — the one state where a
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* stale reading surface is actively misleading. Polling is gated on there
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* being something open, so an idle workspace issues no requests at all.
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*
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* `refresh` is held in a ref rather than listed as a dependency: callers rebuild
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* it every render, and depending on it would tear down and restart the interval
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* each time, so it would never fire.
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*/
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export function useLiveRefresh(active: boolean, refresh: () => void): void {
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const refreshRef = useRef(refresh);
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refreshRef.current = refresh;
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useEffect(() => {
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if (!active) return;
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const id = setInterval(() => refreshRef.current(), LIVE_REFRESH_INTERVAL_MS);
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return () => clearInterval(id);
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}, [active]);
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}
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