José Almeida
46 lines
1.4 KiB
TypeScript
46 lines
1.4 KiB
TypeScript
type RefreshEntry = {
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timer?: ReturnType<typeof setTimeout>;
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dueAt: number;
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refresh: () => void;
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};
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/** Schedules only subscribed scopes while the document is visible. */
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export function createRemoteExecutorStatusRefresh(interval: number) {
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const active = new Map<string, RefreshEntry>();
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function schedule(entry: RefreshEntry) {
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clearTimeout(entry.timer);
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if (typeof document === "undefined" || document.visibilityState === "hidden") return;
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entry.timer = setTimeout(entry.refresh, Math.max(0, entry.dueAt - Date.now()));
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}
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function onVisibilityChange() {
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active.forEach(schedule);
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}
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return {
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activate(scope: string, refresh: () => void, dueAt: number) {
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if (active.has(scope)) return;
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if (active.size === 0 && typeof document !== "undefined") {
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document.addEventListener("visibilitychange", onVisibilityChange);
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}
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const entry = { refresh, dueAt };
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active.set(scope, entry);
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schedule(entry);
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},
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settled(scope: string) {
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const entry = active.get(scope);
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if (!entry) return;
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entry.dueAt = Date.now() + interval;
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schedule(entry);
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},
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deactivate(scope: string) {
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clearTimeout(active.get(scope)?.timer);
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active.delete(scope);
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if (active.size === 0 && typeof document !== "undefined") {
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document.removeEventListener("visibilitychange", onVisibilityChange);
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}
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},
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};
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}
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