1 import { WorkerEvents
, WorkerSetElement
} from
'../types/Worker';
3 import Constants from
'../utils/Constants';
4 import Utils from
'../utils/Utils';
5 import { Worker
} from
'worker_threads';
6 import Wrk from
'./Wrk';
8 export default class WorkerSet
<T
> extends Wrk
{
9 public maxElementsPerWorker
: number;
10 private workerSet
: Set
<WorkerSetElement
>;
13 * Create a new `WorkerSet`.
15 * @param {string} workerScript
16 * @param {number} maxElementsPerWorker
18 constructor(workerScript
: string, maxElementsPerWorker
= 1) {
20 this.workerSet
= new Set
<WorkerSetElement
>();
21 this.maxElementsPerWorker
= maxElementsPerWorker
;
25 return this.workerSet
.size
;
30 * @return {Promise<void>}
33 public async addElement(elementData
: T
): Promise
<void> {
34 if (!this.workerSet
) {
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
);
59 * @return {Promise<void>}
62 public async stop(): Promise
<void> {
63 for (const workerSetElement
of this.workerSet
) {
64 await workerSetElement
.worker
.terminate();
66 this.workerSet
.clear();
74 private startWorker(): void {
75 const worker
= new Worker(this.workerScript
);
76 worker
.on('message', () => { });
77 worker
.on('error', () => { });
78 worker
.on('exit', (code
) => {
80 console
.error(`Worker stopped with exit code ${code}`);
82 this.workerSet
.delete(this.getWorkerSetElementByWorker(worker
));
84 this.workerSet
.add({ worker
, numberOfWorkerElements
: 0 });
87 private getLastWorkerSetElement(): WorkerSetElement
{
88 let workerSetElement
: WorkerSetElement
;
89 // eslint-disable-next-line no-empty
90 for (workerSetElement
of this.workerSet
) { }
91 return workerSetElement
;
94 private getLastWorker(): Worker
{
95 return this.getLastWorkerSetElement().worker
;
98 private getWorkerSetElementByWorker(worker
: Worker
): WorkerSetElement
{
99 let workerSetElt
: WorkerSetElement
;
100 this.workerSet
.forEach((workerSetElement
) => {
101 if (JSON
.stringify(workerSetElement
.worker
) === JSON
.stringify(worker
)) {
102 workerSetElt
= workerSetElement
;