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WorkerQueue.ts (54 lines lightweight typescript worker queue)
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| interface QueueItem<T, R> { | |
| task: T; | |
| resolve: (result: R) => void; | |
| reject: (error: Error) => void; | |
| } | |
| type Worker<T, R> = (task: T) => Promise<R>; | |
| export class WorkerQueue<T, R> { | |
| queue: QueueItem<T, R>[]; | |
| worker: Worker<T, R>; | |
| numOfWorkers: number; | |
| runningWorkersCount: number; | |
| constructor(worker: Worker<T, R>, numOfWorkers = 1) { | |
| this.queue = []; | |
| this.worker = worker; | |
| this.numOfWorkers = numOfWorkers; | |
| this.runningWorkersCount = 0; | |
| } | |
| push(item: T) { | |
| const { promise, resolve, reject } = Promise.withResolvers<R>(); | |
| this.queue.push({ | |
| task: item, | |
| resolve, | |
| reject, | |
| }); | |
| this.callWorkers(); | |
| return promise; | |
| } | |
| private callWorkers() { | |
| for (let i = 0; i < this.numOfWorkers - this.runningWorkersCount; i++) { | |
| this.callNextTask(); | |
| } | |
| } | |
| private async callNextTask() { | |
| const item = this.queue.shift(); | |
| if (!item) { | |
| return; | |
| } | |
| this.runningWorkersCount++; | |
| try { | |
| const result = await this.worker(item.task); | |
| item.resolve(result); | |
| } catch (e) { | |
| item.reject(e as Error); | |
| } | |
| this.runningWorkersCount--; | |
| this.callWorkers(); | |
| } | |
| } | |
| // EXAMPLE | |
| const workerQueue = new WorkerQueue(async (num: number) => console.log(num), 10); | |
| const promises: Promise<number> = [] | |
| for (let i = 0; i < 100; i++) { | |
| promises.push(workerQueue.push(i)); | |
| } | |
| await Promise.all(promises); |
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