| 1 | export interface PollClock { |
| 2 | schedule(callback: () => void, delay: number): unknown; |
| 3 | cancel(handle: unknown): void; |
| 4 | } |
| 5 | |
| 6 | export function createSerialWorkspacePoll(clock: PollClock, interval = 5000) { |
| 7 | let job: (() => Promise<void>) | null = null; |
| 8 | let timer: unknown = null; |
| 9 | let running = false; |
| 10 | let pending = false; |
| 11 | const clear = () => { |
| 12 | if (timer !== null) clock.cancel(timer); |
| 13 | timer = null; |
| 14 | }; |
| 15 | const run = () => { |
| 16 | clear(); |
| 17 | if (!job) return; |
| 18 | if (running) { pending = true; return; } |
| 19 | const current = job; |
| 20 | running = true; |
| 21 | pending = false; |
| 22 | void Promise.resolve().then(() => job === current ? current() : undefined).catch(() => {}).finally(() => { |
| 23 | running = false; |
| 24 | if (!job) return; |
| 25 | if (pending || job !== current) run(); |
| 26 | else timer = clock.schedule(run, interval); |
| 27 | }); |
| 28 | }; |
| 29 | return { |
| 30 | setJob(next: (() => Promise<void>) | null) { |
| 31 | clear(); |
| 32 | job = next; |
| 33 | pending = false; |
| 34 | if (job) run(); |
| 35 | }, |
| 36 | refresh: run, |
| 37 | }; |
| 38 | } |
| 39 |