1 import { Worker
, threadId
} from
'worker_threads';
2 import { WorkerData
, WorkerEvents
, WorkerSetElement
} from
'../types/Worker';
4 import Constants from
'../utils/Constants';
5 import Utils from
'../utils/Utils';
6 import Wrk from
'./Wrk';
8 export default class WorkerSet
extends Wrk
{
9 public maxElementsPerWorker
: number;
10 private workers
: Set
<WorkerSetElement
>;
13 * Create a new `WorkerSet`.
15 * @param {string} workerScript
16 * @param {number} maxElementsPerWorker
18 constructor(workerScript
: string, maxElementsPerWorker
= 1) {
20 this.workers
= new Set
<WorkerSetElement
>();
21 this.maxElementsPerWorker
= maxElementsPerWorker
;
25 return this.workers
.size
;
30 * @return {Promise<void>}
33 public async addElement(elementData
: WorkerData
): Promise
<void> {
35 throw Error('Cannot add a WorkerSet element: workers\' set does not exist');
37 if (this.getLastWorkerSetElement().numberOfWorkerElements
>= this.maxElementsPerWorker
) {
39 // Start worker sequentially to optimize memory at startup
40 await Utils
.sleep(Constants
.START_WORKER_DELAY
);
42 this.getLastWorker().postMessage({ id
: WorkerEvents
.START_WORKER_ELEMENT
, workerData
: elementData
});
43 this.getLastWorkerSetElement().numberOfWorkerElements
++;
48 * @return {Promise<void>}
51 public async start(): Promise
<void> {
53 // Start worker sequentially to optimize memory at startup
54 await Utils
.sleep(Constants
.START_WORKER_DELAY
);
62 private startWorker(): void {
63 const worker
= new Worker(this.workerScript
);
64 worker
.on('message', () => { });
65 worker
.on('error', () => { });
66 worker
.on('exit', (code
) => {
68 console
.error(`Worker ${threadId} stopped with exit code ${code}`);
71 this.workers
.add({ worker
, numberOfWorkerElements
: 0 });
74 private getLastWorkerSetElement(): WorkerSetElement
{
75 let workerSetElement
: WorkerSetElement
;
76 // eslint-disable-next-line no-empty
77 for (workerSetElement
of this.workers
) { }
78 return workerSetElement
;
81 private getLastWorker(): Worker
{
82 return this.getLastWorkerSetElement().worker
;