Commit | Line | Data |
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8434025b | 1 | import { WorkerEvents, WorkerSetElement } from '../types/Worker'; |
c045d9a9 | 2 | |
6013bc53 | 3 | import Utils from '../utils/Utils'; |
1e924543 | 4 | import { Worker } from 'worker_threads'; |
fd1fdf1b | 5 | import WorkerAbstract from './WorkerAbstract'; |
7874b0b1 | 6 | import { WorkerUtils } from './WorkerUtils'; |
6013bc53 | 7 | |
fd1fdf1b | 8 | export default class WorkerSet<T> extends WorkerAbstract { |
6013bc53 | 9 | public maxElementsPerWorker: number; |
ded13d97 | 10 | private workerSet: Set<WorkerSetElement>; |
6013bc53 JB |
11 | |
12 | /** | |
13 | * Create a new `WorkerSet`. | |
14 | * | |
15 | * @param {string} workerScript | |
16 | * @param {number} maxElementsPerWorker | |
322c9192 | 17 | * @param {number} workerStartDelay |
6013bc53 | 18 | */ |
322c9192 JB |
19 | constructor(workerScript: string, maxElementsPerWorker = 1, workerStartDelay?: number) { |
20 | super(workerScript, workerStartDelay); | |
ded13d97 | 21 | this.workerSet = new Set<WorkerSetElement>(); |
6013bc53 | 22 | this.maxElementsPerWorker = maxElementsPerWorker; |
6013bc53 JB |
23 | } |
24 | ||
25 | get size(): number { | |
ded13d97 | 26 | return this.workerSet.size; |
6013bc53 JB |
27 | } |
28 | ||
29 | /** | |
30 | * | |
6e0964c8 | 31 | * @param {T} elementData |
3340259a | 32 | * @returns {Promise<void>} |
6013bc53 JB |
33 | * @public |
34 | */ | |
8434025b | 35 | public async addElement(elementData: T): Promise<void> { |
ded13d97 | 36 | if (!this.workerSet) { |
290d006c | 37 | throw new Error('Cannot add a WorkerSet element: workers\' set does not exist'); |
6013bc53 | 38 | } |
c045d9a9 | 39 | if (this.getLastWorkerSetElement().numberOfWorkerElements >= this.maxElementsPerWorker) { |
a4624c96 | 40 | this.startWorker(); |
6013bc53 | 41 | // Start worker sequentially to optimize memory at startup |
322c9192 | 42 | await Utils.sleep(this.workerStartDelay); |
6013bc53 | 43 | } |
3e1416d8 | 44 | this.getLastWorker().postMessage({ id: WorkerEvents.START_WORKER_ELEMENT, workerData: elementData }); |
c045d9a9 | 45 | this.getLastWorkerSetElement().numberOfWorkerElements++; |
6013bc53 JB |
46 | } |
47 | ||
48 | /** | |
49 | * | |
3340259a | 50 | * @returns {Promise<void>} |
6013bc53 JB |
51 | * @public |
52 | */ | |
53 | public async start(): Promise<void> { | |
a4624c96 | 54 | this.startWorker(); |
6013bc53 | 55 | // Start worker sequentially to optimize memory at startup |
322c9192 | 56 | await Utils.sleep(this.workerStartDelay); |
6013bc53 JB |
57 | } |
58 | ||
ded13d97 JB |
59 | /** |
60 | * | |
3340259a | 61 | * @returns {Promise<void>} |
ded13d97 JB |
62 | * @public |
63 | */ | |
64 | public async stop(): Promise<void> { | |
65 | for (const workerSetElement of this.workerSet) { | |
66 | await workerSetElement.worker.terminate(); | |
67 | } | |
68 | this.workerSet.clear(); | |
69 | } | |
70 | ||
6013bc53 JB |
71 | /** |
72 | * | |
6013bc53 JB |
73 | * @private |
74 | */ | |
a4624c96 JB |
75 | private startWorker(): void { |
76 | const worker = new Worker(this.workerScript); | |
77 | worker.on('message', () => { }); | |
78 | worker.on('error', () => { }); | |
79 | worker.on('exit', (code) => { | |
7874b0b1 | 80 | WorkerUtils.defaultExitHandler(code); |
d7a48614 | 81 | this.workerSet.delete(this.getWorkerSetElementByWorker(worker)); |
6013bc53 | 82 | }); |
ded13d97 | 83 | this.workerSet.add({ worker, numberOfWorkerElements: 0 }); |
6013bc53 JB |
84 | } |
85 | ||
c045d9a9 JB |
86 | private getLastWorkerSetElement(): WorkerSetElement { |
87 | let workerSetElement: WorkerSetElement; | |
6013bc53 | 88 | // eslint-disable-next-line no-empty |
ded13d97 | 89 | for (workerSetElement of this.workerSet) { } |
c045d9a9 JB |
90 | return workerSetElement; |
91 | } | |
92 | ||
93 | private getLastWorker(): Worker { | |
94 | return this.getLastWorkerSetElement().worker; | |
6013bc53 | 95 | } |
1e924543 JB |
96 | |
97 | private getWorkerSetElementByWorker(worker: Worker): WorkerSetElement { | |
98 | let workerSetElt: WorkerSetElement; | |
ded13d97 | 99 | this.workerSet.forEach((workerSetElement) => { |
81696bd5 | 100 | if (workerSetElement.worker.threadId === worker.threadId) { |
1e924543 JB |
101 | workerSetElt = workerSetElement; |
102 | } | |
103 | }); | |
104 | return workerSetElt; | |
105 | } | |
6013bc53 | 106 | } |