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edd13439 | 1 | // Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved. |
c8eeb62b | 2 | |
962a8159 | 3 | import EventEmitterAsyncResource from 'node:events'; |
01f4001e | 4 | import { Worker } from 'node:worker_threads'; |
c045d9a9 | 5 | |
268a74bb | 6 | import { WorkerAbstract } from './WorkerAbstract'; |
59b6ed8d | 7 | import { WorkerConstants } from './WorkerConstants'; |
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8 | import { |
9 | type MessageHandler, | |
b779c0f8 | 10 | type SetInfo, |
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11 | type WorkerData, |
12 | WorkerMessageEvents, | |
13 | type WorkerOptions, | |
14 | type WorkerSetElement, | |
268a74bb | 15 | } from './WorkerTypes'; |
789871d6 | 16 | import { defaultErrorHandler, defaultExitHandler, sleep } from './WorkerUtils'; |
6013bc53 | 17 | |
268a74bb | 18 | export class WorkerSet extends WorkerAbstract<WorkerData> { |
962a8159 | 19 | public readonly emitter: EventEmitterAsyncResource; |
f2bf9948 | 20 | private readonly workerSet: Set<WorkerSetElement>; |
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21 | |
22 | /** | |
23 | * Create a new `WorkerSet`. | |
24 | * | |
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25 | * @param workerScript - |
26 | * @param workerOptions - | |
6013bc53 | 27 | */ |
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28 | constructor(workerScript: string, workerOptions?: WorkerOptions) { |
29 | super(workerScript, workerOptions); | |
ffd71f2c | 30 | this.workerSet = new Set<WorkerSetElement>(); |
962a8159 | 31 | this.emitter = new EventEmitterAsyncResource(); |
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32 | } |
33 | ||
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34 | get info(): SetInfo { |
35 | return { | |
36 | size: this.size, | |
37 | runningElements: [...this.workerSet].reduce( | |
38 | (accumulator, workerSetElement) => accumulator + workerSetElement.numberOfWorkerElements, | |
39 | 0 | |
40 | ), | |
41 | elementsPerWorker: this.maxElementsPerWorker, | |
42 | }; | |
43 | } | |
44 | ||
6013bc53 | 45 | get size(): number { |
ded13d97 | 46 | return this.workerSet.size; |
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47 | } |
48 | ||
72092cfc | 49 | get maxElementsPerWorker(): number | undefined { |
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50 | return this.workerOptions.elementsPerWorker; |
51 | } | |
52 | ||
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53 | /** @inheritDoc */ |
54 | public async start(): Promise<void> { | |
55 | this.addWorkerSetElement(); | |
56 | // Add worker set element sequentially to optimize memory at startup | |
57 | this.workerOptions.workerStartDelay > 0 && (await sleep(this.workerOptions.workerStartDelay)); | |
58 | } | |
59 | ||
60 | /** @inheritDoc */ | |
61 | public async stop(): Promise<void> { | |
62 | for (const workerSetElement of this.workerSet) { | |
63 | await workerSetElement.worker.terminate(); | |
64 | } | |
65 | this.workerSet.clear(); | |
66 | } | |
67 | ||
8baf3f8f | 68 | /** @inheritDoc */ |
c3ee95af | 69 | public async addElement(elementData: WorkerData): Promise<void> { |
ded13d97 | 70 | if (!this.workerSet) { |
e7aeea18 | 71 | throw new Error("Cannot add a WorkerSet element: workers' set does not exist"); |
6013bc53 | 72 | } |
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73 | const workerSetElement = await this.getWorkerSetElement(); |
74 | workerSetElement.worker.postMessage({ | |
721646e9 | 75 | id: WorkerMessageEvents.startWorkerElement, |
e7aeea18 | 76 | data: elementData, |
d070d967 | 77 | }); |
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78 | ++workerSetElement.numberOfWorkerElements; |
79 | // Add element sequentially to optimize memory at startup | |
d070d967 | 80 | if (this.workerOptions.elementStartDelay > 0) { |
789871d6 | 81 | await sleep(this.workerOptions.elementStartDelay); |
d070d967 | 82 | } |
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83 | } |
84 | ||
6013bc53 | 85 | /** |
962a8159 | 86 | * Add a new `WorkerSetElement`. |
6013bc53 | 87 | */ |
962a8159 | 88 | private addWorkerSetElement(): WorkerSetElement { |
a4624c96 | 89 | const worker = new Worker(this.workerScript); |
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90 | worker.on( |
91 | 'message', | |
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92 | (this.workerOptions?.messageHandler ?? WorkerConstants.EMPTY_FUNCTION).bind( |
93 | this | |
94 | ) as MessageHandler<Worker> | |
0e4fa348 | 95 | ); |
789871d6 | 96 | worker.on('error', defaultErrorHandler.bind(this) as (err: Error) => void); |
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97 | worker.on('error', (error) => { |
98 | this.emitter.emit('error', error); | |
99 | this.addWorkerSetElement(); | |
100 | }); | |
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101 | worker.on('exit', defaultExitHandler.bind(this) as (exitCode: number) => void); |
102 | worker.on('exit', () => this.workerSet.delete(this.getWorkerSetElementByWorker(worker))); | |
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103 | const workerSetElement: WorkerSetElement = { worker, numberOfWorkerElements: 0 }; |
104 | this.workerSet.add(workerSetElement); | |
105 | return workerSetElement; | |
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106 | } |
107 | ||
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108 | private async getWorkerSetElement(): Promise<WorkerSetElement> { |
109 | let chosenWorkerSetElement: WorkerSetElement; | |
110 | for (const workerSetElement of this.workerSet) { | |
111 | if (workerSetElement.numberOfWorkerElements < this.workerOptions.elementsPerWorker) { | |
112 | chosenWorkerSetElement = workerSetElement; | |
113 | break; | |
114 | } | |
e7aeea18 | 115 | } |
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116 | if (!chosenWorkerSetElement) { |
117 | chosenWorkerSetElement = this.addWorkerSetElement(); | |
118 | // Add worker set element sequentially to optimize memory at startup | |
119 | this.workerOptions.workerStartDelay > 0 && (await sleep(this.workerOptions.workerStartDelay)); | |
120 | } | |
121 | return chosenWorkerSetElement; | |
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122 | } |
123 | ||
962a8159 | 124 | private getWorkerSetElementByWorker(worker: Worker): WorkerSetElement | undefined { |
1e924543 | 125 | let workerSetElt: WorkerSetElement; |
0e7a11e1 | 126 | for (const workerSetElement of this.workerSet) { |
81696bd5 | 127 | if (workerSetElement.worker.threadId === worker.threadId) { |
1e924543 | 128 | workerSetElt = workerSetElement; |
0e7a11e1 | 129 | break; |
1e924543 | 130 | } |
0e7a11e1 | 131 | } |
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132 | return workerSetElt; |
133 | } | |
6013bc53 | 134 | } |