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edd13439 | 1 | // Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved. |
c8eeb62b | 2 | |
962a8159 | 3 | import EventEmitterAsyncResource from 'node:events'; |
be245fda | 4 | import { SHARE_ENV, Worker } from 'node:worker_threads'; |
c045d9a9 | 5 | |
268a74bb | 6 | import { WorkerAbstract } from './WorkerAbstract'; |
59b6ed8d | 7 | import { WorkerConstants } from './WorkerConstants'; |
0e4fa348 | 8 | import { |
b779c0f8 | 9 | type SetInfo, |
0e4fa348 JB |
10 | type WorkerData, |
11 | WorkerMessageEvents, | |
12 | type WorkerOptions, | |
13 | type WorkerSetElement, | |
810f4caf | 14 | WorkerSetEvents, |
268a74bb | 15 | } from './WorkerTypes'; |
be245fda | 16 | import { 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>; |
6013bc53 JB |
21 | |
22 | /** | |
23 | * Create a new `WorkerSet`. | |
24 | * | |
0e4fa348 JB |
25 | * @param workerScript - |
26 | * @param workerOptions - | |
6013bc53 | 27 | */ |
4d7227e6 JB |
28 | constructor(workerScript: string, workerOptions?: WorkerOptions) { |
29 | super(workerScript, workerOptions); | |
29bb4dee JB |
30 | this.workerOptions.poolOptions = { |
31 | ...{ | |
32 | enableEvents: true, | |
33 | restartWorkerOnError: true, | |
34 | }, | |
35 | ...this.workerOptions.poolOptions, | |
36 | }; | |
ffd71f2c | 37 | this.workerSet = new Set<WorkerSetElement>(); |
29bb4dee JB |
38 | if (this.workerOptions?.poolOptions?.enableEvents) { |
39 | this.emitter = new EventEmitterAsyncResource(); | |
40 | } | |
6013bc53 JB |
41 | } |
42 | ||
b779c0f8 JB |
43 | get info(): SetInfo { |
44 | return { | |
45 | size: this.size, | |
46 | runningElements: [...this.workerSet].reduce( | |
47 | (accumulator, workerSetElement) => accumulator + workerSetElement.numberOfWorkerElements, | |
48 | 0 | |
49 | ), | |
50 | elementsPerWorker: this.maxElementsPerWorker, | |
51 | }; | |
52 | } | |
53 | ||
6013bc53 | 54 | get size(): number { |
ded13d97 | 55 | return this.workerSet.size; |
6013bc53 JB |
56 | } |
57 | ||
72092cfc | 58 | get maxElementsPerWorker(): number | undefined { |
4d7227e6 JB |
59 | return this.workerOptions.elementsPerWorker; |
60 | } | |
61 | ||
b0dee778 JB |
62 | /** @inheritDoc */ |
63 | public async start(): Promise<void> { | |
64 | this.addWorkerSetElement(); | |
65 | // Add worker set element sequentially to optimize memory at startup | |
66 | this.workerOptions.workerStartDelay > 0 && (await sleep(this.workerOptions.workerStartDelay)); | |
67 | } | |
68 | ||
69 | /** @inheritDoc */ | |
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 | ||
8baf3f8f | 77 | /** @inheritDoc */ |
c3ee95af | 78 | public async addElement(elementData: WorkerData): Promise<void> { |
ded13d97 | 79 | if (!this.workerSet) { |
e7aeea18 | 80 | throw new Error("Cannot add a WorkerSet element: workers' set does not exist"); |
6013bc53 | 81 | } |
962a8159 JB |
82 | const workerSetElement = await this.getWorkerSetElement(); |
83 | workerSetElement.worker.postMessage({ | |
721646e9 | 84 | id: WorkerMessageEvents.startWorkerElement, |
e7aeea18 | 85 | data: elementData, |
d070d967 | 86 | }); |
962a8159 JB |
87 | ++workerSetElement.numberOfWorkerElements; |
88 | // Add element sequentially to optimize memory at startup | |
d070d967 | 89 | if (this.workerOptions.elementStartDelay > 0) { |
789871d6 | 90 | await sleep(this.workerOptions.elementStartDelay); |
d070d967 | 91 | } |
6013bc53 JB |
92 | } |
93 | ||
6013bc53 | 94 | /** |
962a8159 | 95 | * Add a new `WorkerSetElement`. |
6013bc53 | 96 | */ |
962a8159 | 97 | private addWorkerSetElement(): WorkerSetElement { |
be245fda JB |
98 | const worker = new Worker(this.workerScript, { |
99 | env: SHARE_ENV, | |
100 | ...this.workerOptions.poolOptions.workerOptions, | |
101 | }); | |
0e4fa348 JB |
102 | worker.on( |
103 | 'message', | |
be245fda JB |
104 | this.workerOptions?.poolOptions?.messageHandler ?? WorkerConstants.EMPTY_FUNCTION |
105 | ); | |
106 | worker.on( | |
107 | 'error', | |
108 | this.workerOptions?.poolOptions?.errorHandler ?? WorkerConstants.EMPTY_FUNCTION | |
0e4fa348 | 109 | ); |
962a8159 | 110 | worker.on('error', (error) => { |
29bb4dee JB |
111 | if (this.emitter !== undefined) { |
112 | this.emitter.emit(WorkerSetEvents.error, error); | |
113 | } | |
114 | if (this.workerOptions?.poolOptions?.restartWorkerOnError) { | |
115 | this.addWorkerSetElement(); | |
116 | } | |
962a8159 | 117 | }); |
be245fda JB |
118 | worker.on( |
119 | 'online', | |
120 | this.workerOptions?.poolOptions?.onlineHandler ?? WorkerConstants.EMPTY_FUNCTION | |
121 | ); | |
122 | worker.on( | |
123 | 'exit', | |
124 | this.workerOptions?.poolOptions?.exitHandler ?? WorkerConstants.EMPTY_FUNCTION | |
125 | ); | |
29bb4dee | 126 | worker.once('exit', () => this.workerSet.delete(this.getWorkerSetElementByWorker(worker))); |
962a8159 JB |
127 | const workerSetElement: WorkerSetElement = { worker, numberOfWorkerElements: 0 }; |
128 | this.workerSet.add(workerSetElement); | |
129 | return workerSetElement; | |
6013bc53 JB |
130 | } |
131 | ||
962a8159 JB |
132 | private async getWorkerSetElement(): Promise<WorkerSetElement> { |
133 | let chosenWorkerSetElement: WorkerSetElement; | |
134 | for (const workerSetElement of this.workerSet) { | |
135 | if (workerSetElement.numberOfWorkerElements < this.workerOptions.elementsPerWorker) { | |
136 | chosenWorkerSetElement = workerSetElement; | |
137 | break; | |
138 | } | |
e7aeea18 | 139 | } |
962a8159 JB |
140 | if (!chosenWorkerSetElement) { |
141 | chosenWorkerSetElement = this.addWorkerSetElement(); | |
142 | // Add worker set element sequentially to optimize memory at startup | |
143 | this.workerOptions.workerStartDelay > 0 && (await sleep(this.workerOptions.workerStartDelay)); | |
144 | } | |
145 | return chosenWorkerSetElement; | |
c045d9a9 JB |
146 | } |
147 | ||
962a8159 | 148 | private getWorkerSetElementByWorker(worker: Worker): WorkerSetElement | undefined { |
1e924543 | 149 | let workerSetElt: WorkerSetElement; |
0e7a11e1 | 150 | for (const workerSetElement of this.workerSet) { |
81696bd5 | 151 | if (workerSetElement.worker.threadId === worker.threadId) { |
1e924543 | 152 | workerSetElt = workerSetElement; |
0e7a11e1 | 153 | break; |
1e924543 | 154 | } |
0e7a11e1 | 155 | } |
1e924543 JB |
156 | return workerSetElt; |
157 | } | |
6013bc53 | 158 | } |