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1 | // Partial Copyright Jerome Benoit. 2021. All Rights Reserved. |
2 | ||
8434025b | 3 | import { WorkerEvents, WorkerSetElement } from '../types/Worker'; |
c045d9a9 | 4 | |
6013bc53 | 5 | import Utils from '../utils/Utils'; |
1e924543 | 6 | import { Worker } from 'worker_threads'; |
fd1fdf1b | 7 | import WorkerAbstract from './WorkerAbstract'; |
7874b0b1 | 8 | import { WorkerUtils } from './WorkerUtils'; |
6013bc53 | 9 | |
fd1fdf1b | 10 | export default class WorkerSet<T> extends WorkerAbstract { |
6013bc53 | 11 | public maxElementsPerWorker: number; |
ded13d97 | 12 | private workerSet: Set<WorkerSetElement>; |
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13 | |
14 | /** | |
15 | * Create a new `WorkerSet`. | |
16 | * | |
17 | * @param {string} workerScript | |
18 | * @param {number} maxElementsPerWorker | |
322c9192 | 19 | * @param {number} workerStartDelay |
6013bc53 | 20 | */ |
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21 | constructor(workerScript: string, maxElementsPerWorker = 1, workerStartDelay?: number) { |
22 | super(workerScript, workerStartDelay); | |
ded13d97 | 23 | this.workerSet = new Set<WorkerSetElement>(); |
6013bc53 | 24 | this.maxElementsPerWorker = maxElementsPerWorker; |
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25 | } |
26 | ||
27 | get size(): number { | |
ded13d97 | 28 | return this.workerSet.size; |
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29 | } |
30 | ||
31 | /** | |
32 | * | |
6e0964c8 | 33 | * @param {T} elementData |
3340259a | 34 | * @returns {Promise<void>} |
6013bc53 JB |
35 | * @public |
36 | */ | |
8434025b | 37 | public async addElement(elementData: T): Promise<void> { |
ded13d97 | 38 | if (!this.workerSet) { |
290d006c | 39 | throw new Error('Cannot add a WorkerSet element: workers\' set does not exist'); |
6013bc53 | 40 | } |
c045d9a9 | 41 | if (this.getLastWorkerSetElement().numberOfWorkerElements >= this.maxElementsPerWorker) { |
a4624c96 | 42 | this.startWorker(); |
6013bc53 | 43 | // Start worker sequentially to optimize memory at startup |
322c9192 | 44 | await Utils.sleep(this.workerStartDelay); |
6013bc53 | 45 | } |
3e1416d8 | 46 | this.getLastWorker().postMessage({ id: WorkerEvents.START_WORKER_ELEMENT, workerData: elementData }); |
c045d9a9 | 47 | this.getLastWorkerSetElement().numberOfWorkerElements++; |
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48 | } |
49 | ||
50 | /** | |
51 | * | |
3340259a | 52 | * @returns {Promise<void>} |
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53 | * @public |
54 | */ | |
55 | public async start(): Promise<void> { | |
a4624c96 | 56 | this.startWorker(); |
6013bc53 | 57 | // Start worker sequentially to optimize memory at startup |
322c9192 | 58 | await Utils.sleep(this.workerStartDelay); |
6013bc53 JB |
59 | } |
60 | ||
ded13d97 JB |
61 | /** |
62 | * | |
3340259a | 63 | * @returns {Promise<void>} |
ded13d97 JB |
64 | * @public |
65 | */ | |
66 | public async stop(): Promise<void> { | |
67 | for (const workerSetElement of this.workerSet) { | |
68 | await workerSetElement.worker.terminate(); | |
69 | } | |
70 | this.workerSet.clear(); | |
71 | } | |
72 | ||
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73 | /** |
74 | * | |
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75 | * @private |
76 | */ | |
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77 | private startWorker(): void { |
78 | const worker = new Worker(this.workerScript); | |
79 | worker.on('message', () => { }); | |
80 | worker.on('error', () => { }); | |
81 | worker.on('exit', (code) => { | |
7874b0b1 | 82 | WorkerUtils.defaultExitHandler(code); |
d7a48614 | 83 | this.workerSet.delete(this.getWorkerSetElementByWorker(worker)); |
6013bc53 | 84 | }); |
ded13d97 | 85 | this.workerSet.add({ worker, numberOfWorkerElements: 0 }); |
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86 | } |
87 | ||
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88 | private getLastWorkerSetElement(): WorkerSetElement { |
89 | let workerSetElement: WorkerSetElement; | |
6013bc53 | 90 | // eslint-disable-next-line no-empty |
ded13d97 | 91 | for (workerSetElement of this.workerSet) { } |
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92 | return workerSetElement; |
93 | } | |
94 | ||
95 | private getLastWorker(): Worker { | |
96 | return this.getLastWorkerSetElement().worker; | |
6013bc53 | 97 | } |
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98 | |
99 | private getWorkerSetElementByWorker(worker: Worker): WorkerSetElement { | |
100 | let workerSetElt: WorkerSetElement; | |
ded13d97 | 101 | this.workerSet.forEach((workerSetElement) => { |
81696bd5 | 102 | if (workerSetElement.worker.threadId === worker.threadId) { |
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103 | workerSetElt = workerSetElement; |
104 | } | |
105 | }); | |
106 | return workerSetElt; | |
107 | } | |
6013bc53 | 108 | } |