| 1 | import { Worker, WorkerOptions } from 'worker_threads'; |
| 2 | |
| 3 | import Configuration from '../utils/Configuration'; |
| 4 | import Pool from 'worker-threads-pool'; |
| 5 | import WorkerData from '../types/WorkerData'; |
| 6 | import Constants from '../utils/Constants'; |
| 7 | |
| 8 | export default class Wrk { |
| 9 | private _workerScript: string; |
| 10 | private _workerData: WorkerData; |
| 11 | private _index: number; |
| 12 | private _concurrentWorkers: number; |
| 13 | private _worker: Worker; |
| 14 | |
| 15 | /** |
| 16 | * Create a new `Wrk`. |
| 17 | * |
| 18 | * @param {string} workerScript |
| 19 | * @param {WorkerData} workerData |
| 20 | * @param {number} numConcurrentWorkers |
| 21 | */ |
| 22 | constructor(workerScript: string, workerData: WorkerData, numConcurrentWorkers: number) { |
| 23 | this._workerData = workerData; |
| 24 | this._index = workerData.index; |
| 25 | this._workerScript = workerScript; |
| 26 | if (Configuration.useWorkerPool()) { |
| 27 | this._concurrentWorkers = Configuration.getWorkerPoolSize(); |
| 28 | WorkerPool.concurrentWorkers = this._concurrentWorkers; |
| 29 | } else { |
| 30 | this._concurrentWorkers = numConcurrentWorkers; |
| 31 | } |
| 32 | } |
| 33 | |
| 34 | /** |
| 35 | * @return {number} |
| 36 | * @public |
| 37 | */ |
| 38 | public get concurrentWorkers(): number { |
| 39 | return this._concurrentWorkers; |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * |
| 44 | * @return {Promise} |
| 45 | * @public |
| 46 | */ |
| 47 | async start(): Promise<Worker> { |
| 48 | if (Configuration.useWorkerPool()) { |
| 49 | this._startWorkerWithPool(); |
| 50 | } else { |
| 51 | this._startWorker(); |
| 52 | } |
| 53 | return this._worker; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * |
| 58 | * @return {Promise} |
| 59 | * @public |
| 60 | */ |
| 61 | async startNewChargingStation(workerData: WorkerData, numConcurrentWorkers: number): Promise<void> { |
| 62 | this._workerData = workerData; |
| 63 | this._index = workerData.index; |
| 64 | this._concurrentWorkers = numConcurrentWorkers; |
| 65 | this._worker.postMessage({ id : Constants.START_NEW_CHARGING_STATION, workerData: workerData }); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * |
| 70 | * @return {Promise} |
| 71 | * @private |
| 72 | */ |
| 73 | private async _startWorkerWithPool() { |
| 74 | return new Promise((resolve, reject) => { |
| 75 | WorkerPool.acquire(this._workerScript, { workerData: this._workerData }, (err, worker) => { |
| 76 | if (err) { |
| 77 | return reject(err); |
| 78 | } |
| 79 | worker.once('message', resolve); |
| 80 | worker.once('error', reject); |
| 81 | this._worker = worker; |
| 82 | }); |
| 83 | }); |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * |
| 88 | * @return {Promise} |
| 89 | * @private |
| 90 | */ |
| 91 | private async _startWorker() { |
| 92 | return new Promise((resolve, reject) => { |
| 93 | const worker = new Worker(this._workerScript, { workerData: this._workerData }); |
| 94 | worker.on('message', resolve); |
| 95 | worker.on('error', reject); |
| 96 | worker.on('exit', (code) => { |
| 97 | if (code !== 0) { |
| 98 | reject(new Error(`Worker id ${this._index} stopped with exit code ${code}`)); |
| 99 | } |
| 100 | }); |
| 101 | this._worker = worker; |
| 102 | }); |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | class WorkerPool { |
| 107 | public static concurrentWorkers: number; |
| 108 | private static _instance: Pool; |
| 109 | |
| 110 | private constructor() { } |
| 111 | |
| 112 | public static getInstance(): Pool { |
| 113 | if (!WorkerPool._instance || (WorkerPool._instance?.size === WorkerPool.concurrentWorkers)) { |
| 114 | WorkerPool._instance = new Pool({ max: WorkerPool.concurrentWorkers }); |
| 115 | } |
| 116 | return WorkerPool._instance; |
| 117 | } |
| 118 | |
| 119 | public static acquire(filename: string, options: WorkerOptions, callback: (error: Error | null, worker: Worker) => void): void { |
| 120 | WorkerPool.getInstance().acquire(filename, options, callback); |
| 121 | } |
| 122 | } |