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1 | // Partial Copyright Jerome Benoit. 2021. All Rights Reserved. |
2 | ||
4bfd80fa | 3 | import { WorkerData, WorkerMessageEvents, WorkerOptions, WorkerSetElement, WorkerStartOptions } 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 | |
c3ee95af | 10 | export default class WorkerSet extends WorkerAbstract<WorkerData> { |
ffd71f2c | 11 | public readonly maxElementsPerWorker: number; |
821c6c82 | 12 | private readonly messageHandler: (message: unknown) => void | Promise<void>; |
f2bf9948 | 13 | private readonly workerSet: Set<WorkerSetElement>; |
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14 | |
15 | /** | |
16 | * Create a new `WorkerSet`. | |
17 | * | |
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18 | * @param workerScript |
19 | * @param maxElementsPerWorker | |
4bfd80fa | 20 | * @param workerStartOptions |
ffd71f2c | 21 | * @param opts |
6013bc53 | 22 | */ |
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23 | constructor(workerScript: string, maxElementsPerWorker = 1, workerStartOptions?: WorkerStartOptions, opts?: WorkerOptions) { |
24 | super(workerScript, workerStartOptions); | |
6013bc53 | 25 | this.maxElementsPerWorker = maxElementsPerWorker; |
0dad4bda | 26 | this.messageHandler = opts?.messageHandler ?? (() => { /* This is intentional */ }); |
ffd71f2c | 27 | this.workerSet = new Set<WorkerSetElement>(); |
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28 | } |
29 | ||
30 | get size(): number { | |
ded13d97 | 31 | return this.workerSet.size; |
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32 | } |
33 | ||
34 | /** | |
35 | * | |
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36 | * @param elementData |
37 | * @returns | |
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38 | * @public |
39 | */ | |
c3ee95af | 40 | public async addElement(elementData: WorkerData): Promise<void> { |
ded13d97 | 41 | if (!this.workerSet) { |
290d006c | 42 | throw new Error('Cannot add a WorkerSet element: workers\' set does not exist'); |
6013bc53 | 43 | } |
c045d9a9 | 44 | if (this.getLastWorkerSetElement().numberOfWorkerElements >= this.maxElementsPerWorker) { |
a4624c96 | 45 | this.startWorker(); |
6013bc53 | 46 | // Start worker sequentially to optimize memory at startup |
4bfd80fa | 47 | this.workerStartDelay > 0 && await Utils.sleep(this.workerStartDelay); |
6013bc53 | 48 | } |
2a370053 | 49 | this.getLastWorker().postMessage({ id: WorkerMessageEvents.START_WORKER_ELEMENT, data: elementData }); |
c045d9a9 | 50 | this.getLastWorkerSetElement().numberOfWorkerElements++; |
4bfd80fa | 51 | this.elementStartDelay > 0 && await Utils.sleep(this.elementStartDelay); |
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52 | } |
53 | ||
54 | /** | |
55 | * | |
81797102 | 56 | * @returns |
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57 | * @public |
58 | */ | |
59 | public async start(): Promise<void> { | |
a4624c96 | 60 | this.startWorker(); |
6013bc53 | 61 | // Start worker sequentially to optimize memory at startup |
4bfd80fa | 62 | this.workerStartDelay > 0 && await Utils.sleep(this.workerStartDelay); |
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63 | } |
64 | ||
ded13d97 JB |
65 | /** |
66 | * | |
81797102 | 67 | * @returns |
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68 | * @public |
69 | */ | |
70 | public async stop(): Promise<void> { | |
71 | for (const workerSetElement of this.workerSet) { | |
72 | await workerSetElement.worker.terminate(); | |
73 | } | |
74 | this.workerSet.clear(); | |
75 | } | |
76 | ||
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77 | /** |
78 | * | |
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79 | * @private |
80 | */ | |
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81 | private startWorker(): void { |
82 | const worker = new Worker(this.workerScript); | |
821c6c82 JB |
83 | worker.on('message', (msg) => { |
84 | (async () => { | |
85 | await this.messageHandler(msg); | |
0dad4bda | 86 | })().catch(() => { /* This is intentional */ }); |
821c6c82 | 87 | }); |
6c3cfef8 | 88 | worker.on('error', () => { /* This is intentional */ }); |
a4624c96 | 89 | worker.on('exit', (code) => { |
7874b0b1 | 90 | WorkerUtils.defaultExitHandler(code); |
d7a48614 | 91 | this.workerSet.delete(this.getWorkerSetElementByWorker(worker)); |
6013bc53 | 92 | }); |
ded13d97 | 93 | this.workerSet.add({ worker, numberOfWorkerElements: 0 }); |
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94 | } |
95 | ||
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96 | private getLastWorkerSetElement(): WorkerSetElement { |
97 | let workerSetElement: WorkerSetElement; | |
6c3cfef8 | 98 | for (workerSetElement of this.workerSet) { /* This is intentional */ } |
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99 | return workerSetElement; |
100 | } | |
101 | ||
102 | private getLastWorker(): Worker { | |
103 | return this.getLastWorkerSetElement().worker; | |
6013bc53 | 104 | } |
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105 | |
106 | private getWorkerSetElementByWorker(worker: Worker): WorkerSetElement { | |
107 | let workerSetElt: WorkerSetElement; | |
0e7a11e1 | 108 | for (const workerSetElement of this.workerSet) { |
81696bd5 | 109 | if (workerSetElement.worker.threadId === worker.threadId) { |
1e924543 | 110 | workerSetElt = workerSetElement; |
0e7a11e1 | 111 | break; |
1e924543 | 112 | } |
0e7a11e1 | 113 | } |
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114 | return workerSetElt; |
115 | } | |
6013bc53 | 116 | } |