Antigravity Agent
127 lines
3.7 KiB
Markdown
127 lines
3.7 KiB
Markdown
---
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id: wiki-2026-0508-scheduler-api
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title: Scheduler API
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category: 10_Wiki/Topics
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status: verified
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canonical_id: self
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aliases: [scheduler.postTask, Prioritized Task Scheduling]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.9
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verification_status: applied
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tags: [web, performance, scheduling, browser-api]
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raw_sources: []
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last_reinforced: 2026-05-10
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github_commit: pending
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tech_stack:
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language: JavaScript
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framework: Web Platform
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---
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# Scheduler API
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## 매 한 줄
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> **"매 priority-aware task scheduling for the main thread"**. Scheduler API (`scheduler.postTask`, `scheduler.yield`) 는 long task breakup + priority hint (user-blocking / user-visible / background) 로 INP/responsiveness 최적화. 2026 Chromium + Firefox stable.
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## 매 핵심
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### 매 Priorities
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- `user-blocking`: 매 immediate UI response (input handler post-work).
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- `user-visible`: 매 default — visible 하지만 non-blocking.
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- `background`: 매 lazy work (analytics, prefetch).
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### 매 vs setTimeout(0) / requestIdleCallback
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- 매 setTimeout(0): no priority, no abort.
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- 매 rIC: idle only, deadline-based.
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- 매 postTask: explicit priority + AbortSignal + delay.
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### 매 응용
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1. 매 long list rendering 분할.
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2. 매 input handler 후 heavy work 양보.
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3. 매 background data prefetch.
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## 💻 패턴
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### postTask 기본
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```js
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scheduler.postTask(() => doWork(), { priority: 'background' });
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```
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### scheduler.yield (long task breakup)
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```js
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async function processItems(items) {
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for (const item of items) {
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process(item);
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if (navigator.scheduling?.isInputPending?.() || items.indexOf(item) % 50 === 0) {
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await scheduler.yield();
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}
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}
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}
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```
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### TaskController로 abort
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```js
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const controller = new TaskController({ priority: 'user-visible' });
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scheduler.postTask(longJob, { signal: controller.signal });
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// 매 cancel
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controller.abort();
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// 매 priority 동적 변경
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controller.setPriority('background');
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```
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### Delay
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```js
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scheduler.postTask(refresh, { priority: 'background', delay: 5000 });
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```
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### Polyfill fallback
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```js
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const yield_ = () =>
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globalThis.scheduler?.yield?.() ??
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new Promise(r => setTimeout(r, 0));
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```
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### React + Scheduler API
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```js
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// React 19+ 의 useTransition + scheduler integration
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startTransition(() => {
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scheduler.postTask(() => setState(heavy), { priority: 'background' });
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});
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```
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## 매 결정 기준
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| 상황 | Approach |
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|---|---|
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| Heavy work after input | `scheduler.yield()` mid-loop |
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| Lazy prefetch | `postTask({priority:'background'})` |
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| Cancel-able task | `TaskController` |
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| Idle-only callback | `requestIdleCallback` |
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| 매 simple deferral | `queueMicrotask` |
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**기본값**: 매 long loops 의 `scheduler.yield()` + 매 background work `postTask({priority:'background'})`.
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## 🔗 Graph
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- 부모: [[Browser_Event_Loop]] · [[Core_Web_Vitals]]
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- 변형: [[requestIdleCallback]] · [[queueMicrotask]]
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- 응용: [[INP_Optimization]] · [[Long_Task_Breakup]]
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- Adjacent: [[AbortController]] · [[React_useTransition]]
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## 🤖 LLM 활용
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**언제**: 매 INP regression 발견 + 매 long task (>50ms) breakup 필요 시. 매 prioritized background work.
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**언제 X**: 매 worker offload 가 더 적합한 CPU-heavy work, 또는 매 framework scheduler (React) 가 이미 처리.
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## ❌ 안티패턴
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- **postTask 안 yield**: 매 single long callback 은 여전히 long task. 매 internally yield 필요.
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- **user-blocking 남용**: 매 priority inversion 의. 매 진짜 input-critical 만.
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- **Polyfill 없는 production deploy**: 매 Safari 일부 버전 미지원.
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## 🧪 검증 / 중복
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- Verified (W3C Prioritized Task Scheduling, web.dev/optimize-inp).
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- 신뢰도 A.
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## 🕓 Changelog
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| 날짜 | 변경 |
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|---|---|
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — postTask + yield patterns |
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