| 1 | import { FixedThreadPool, PoolOptions } from 'poolifier'; |
| 2 | |
| 3 | import Constants from '../utils/Constants'; |
| 4 | import Utils from '../utils/Utils'; |
| 5 | import { Worker } from 'worker_threads'; |
| 6 | import WorkerAbstract from './WorkerAbstract'; |
| 7 | import { WorkerData } from '../types/Worker'; |
| 8 | |
| 9 | export default class WorkerStaticPool<T> extends WorkerAbstract { |
| 10 | private pool: StaticPool; |
| 11 | |
| 12 | /** |
| 13 | * Create a new `WorkerStaticPool`. |
| 14 | * |
| 15 | * @param {string} workerScript |
| 16 | * @param {number} numberOfThreads |
| 17 | */ |
| 18 | constructor(workerScript: string, numberOfThreads: number) { |
| 19 | super(workerScript); |
| 20 | this.pool = StaticPool.getInstance(numberOfThreads, this.workerScript); |
| 21 | } |
| 22 | |
| 23 | get size(): number { |
| 24 | return this.pool.workers.length; |
| 25 | } |
| 26 | |
| 27 | get maxElementsPerWorker(): number { |
| 28 | return null; |
| 29 | } |
| 30 | |
| 31 | /** |
| 32 | * |
| 33 | * @returns {Promise<void>} |
| 34 | * @public |
| 35 | */ |
| 36 | // eslint-disable-next-line @typescript-eslint/no-empty-function |
| 37 | public async start(): Promise<void> { } |
| 38 | |
| 39 | /** |
| 40 | * |
| 41 | * @returns {Promise<void>} |
| 42 | * @public |
| 43 | */ |
| 44 | public async stop(): Promise<void> { |
| 45 | return this.pool.destroy(); |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * |
| 50 | * @param elementData |
| 51 | * @returns {Promise<void>} |
| 52 | * @public |
| 53 | */ |
| 54 | public async addElement(elementData: T): Promise<void> { |
| 55 | await this.pool.execute(elementData); |
| 56 | // Start worker sequentially to optimize memory at startup |
| 57 | await Utils.sleep(Constants.START_WORKER_DELAY); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | class StaticPool extends FixedThreadPool<WorkerData> { |
| 62 | private static instance: StaticPool; |
| 63 | |
| 64 | private constructor(numberOfThreads: number, workerScript: string, opts?: PoolOptions<Worker>) { |
| 65 | super(numberOfThreads, workerScript, opts); |
| 66 | } |
| 67 | |
| 68 | public static getInstance(numberOfThreads: number, workerScript: string): StaticPool { |
| 69 | if (!StaticPool.instance) { |
| 70 | StaticPool.instance = new StaticPool(numberOfThreads, workerScript, |
| 71 | { |
| 72 | exitHandler: (code) => { |
| 73 | if (code !== 0) { |
| 74 | console.error(`Worker stopped with exit code ${code}`); |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | ); |
| 79 | } |
| 80 | return StaticPool.instance; |
| 81 | } |
| 82 | } |