| 1 | import { RESOURCE_BUDGETS } from "./resourceBudgets"; |
| 2 | |
| 3 | type Owner = { active: number }; |
| 4 | |
| 5 | type Task = { |
| 6 | owner: Owner; |
| 7 | run: () => void; |
| 8 | cancel: () => void; |
| 9 | }; |
| 10 | |
| 11 | class ContentRequestScheduler { |
| 12 | private active = 0; |
| 13 | private queue: Task[] = []; |
| 14 | |
| 15 | owner(): Owner { return { active: 0 }; } |
| 16 | |
| 17 | schedule(owner: Owner, run: () => void, cancel: () => void): void { |
| 18 | this.queue.push({ owner, run, cancel }); |
| 19 | this.drain(); |
| 20 | } |
| 21 | |
| 22 | release(owner: Owner): void { |
| 23 | owner.active = Math.max(0, owner.active - 1); |
| 24 | this.active = Math.max(0, this.active - 1); |
| 25 | this.drain(); |
| 26 | } |
| 27 | |
| 28 | cancel(owner: Owner): void { |
| 29 | const retained: Task[] = []; |
| 30 | for (const task of this.queue) { |
| 31 | if (task.owner === owner) task.cancel(); |
| 32 | else retained.push(task); |
| 33 | } |
| 34 | this.queue = retained; |
| 35 | } |
| 36 | |
| 37 | private drain(): void { |
| 38 | while (this.active < RESOURCE_BUDGETS.contentReadsGlobal) { |
| 39 | const index = this.queue.findIndex((task) => task.owner.active < RESOURCE_BUDGETS.contentReadsPerSession); |
| 40 | if (index < 0) return; |
| 41 | const [task] = this.queue.splice(index, 1); |
| 42 | this.active += 1; |
| 43 | task.owner.active += 1; |
| 44 | task.run(); |
| 45 | } |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | export const contentRequestScheduler = new ContentRequestScheduler(); |
| 50 |