-import { WorkerEvents, WorkerSetElement } from '../types/Worker';
+// Partial Copyright Jerome Benoit. 2021. All Rights Reserved.
-import Utils from '../utils/Utils';
import { Worker } from 'worker_threads';
+
+import { WorkerData, WorkerMessageEvents, WorkerOptions, WorkerSetElement } from '../types/Worker';
+import Utils from '../utils/Utils';
import WorkerAbstract from './WorkerAbstract';
import { WorkerUtils } from './WorkerUtils';
-export default class WorkerSet<T> extends WorkerAbstract {
- public maxElementsPerWorker: number;
- private workerSet: Set<WorkerSetElement>;
+export default class WorkerSet extends WorkerAbstract<WorkerData> {
+ private readonly workerSet: Set<WorkerSetElement>;
+ private readonly messageHandler: (message: unknown) => void | Promise<void>;
/**
* Create a new `WorkerSet`.
*
- * @param {string} workerScript
- * @param {number} maxElementsPerWorker
- * @param {number} workerStartDelay
+ * @param workerScript
+ * @param workerOptions
*/
- constructor(workerScript: string, maxElementsPerWorker = 1, workerStartDelay?: number) {
- super(workerScript, workerStartDelay);
+ constructor(workerScript: string, workerOptions?: WorkerOptions) {
+ super(workerScript, workerOptions);
this.workerSet = new Set<WorkerSetElement>();
- this.maxElementsPerWorker = maxElementsPerWorker;
+ this.messageHandler =
+ workerOptions?.messageHandler ??
+ (() => {
+ /* This is intentional */
+ });
}
get size(): number {
return this.workerSet.size;
}
+ get maxElementsPerWorker(): number | null {
+ return this.workerOptions.elementsPerWorker;
+ }
+
/**
*
- * @param {T} elementData
- * @returns {Promise<void>}
+ * @param elementData
+ * @returns
* @public
*/
- public async addElement(elementData: T): Promise<void> {
+ public async addElement(elementData: WorkerData): Promise<void> {
if (!this.workerSet) {
- throw new Error('Cannot add a WorkerSet element: workers\' set does not exist');
+ throw new Error("Cannot add a WorkerSet element: workers' set does not exist");
}
- if (this.getLastWorkerSetElement().numberOfWorkerElements >= this.maxElementsPerWorker) {
- this.startWorker();
- // Start worker sequentially to optimize memory at startup
- await Utils.sleep(this.workerStartDelay);
+ if (
+ this.workerSet.size === 0 ||
+ this.getLastWorkerSetElement().numberOfWorkerElements >= this.workerOptions.elementsPerWorker
+ ) {
+ await this.startWorker();
}
- this.getLastWorker().postMessage({ id: WorkerEvents.START_WORKER_ELEMENT, workerData: elementData });
+ this.getLastWorker().postMessage({
+ id: WorkerMessageEvents.START_WORKER_ELEMENT,
+ data: elementData,
+ });
this.getLastWorkerSetElement().numberOfWorkerElements++;
+ // Start element sequentially to optimize memory at startup
+ if (this.workerOptions.elementStartDelay > 0) {
+ await Utils.sleep(this.workerOptions.elementStartDelay);
+ }
}
/**
*
- * @returns {Promise<void>}
+ * @returns
* @public
*/
public async start(): Promise<void> {
- this.startWorker();
- // Start worker sequentially to optimize memory at startup
- await Utils.sleep(this.workerStartDelay);
+ await this.startWorker();
}
/**
*
- * @returns {Promise<void>}
+ * @returns
* @public
*/
public async stop(): Promise<void> {
*
* @private
*/
- private startWorker(): void {
+ private async startWorker(): Promise<void> {
const worker = new Worker(this.workerScript);
- worker.on('message', () => { });
- worker.on('error', () => { });
+ worker.on('message', (msg) => {
+ (async () => {
+ await this.messageHandler(msg);
+ })().catch(() => {
+ /* This is intentional */
+ });
+ });
+ worker.on('error', () => {
+ /* This is intentional */
+ });
worker.on('exit', (code) => {
WorkerUtils.defaultExitHandler(code);
this.workerSet.delete(this.getWorkerSetElementByWorker(worker));
});
this.workerSet.add({ worker, numberOfWorkerElements: 0 });
+ // Start worker sequentially to optimize memory at startup
+ this.workerOptions.workerStartDelay > 0 &&
+ (await Utils.sleep(this.workerOptions.workerStartDelay));
}
private getLastWorkerSetElement(): WorkerSetElement {
let workerSetElement: WorkerSetElement;
- // eslint-disable-next-line no-empty
- for (workerSetElement of this.workerSet) { }
+ for (workerSetElement of this.workerSet) {
+ /* This is intentional */
+ }
return workerSetElement;
}
private getWorkerSetElementByWorker(worker: Worker): WorkerSetElement {
let workerSetElt: WorkerSetElement;
- this.workerSet.forEach((workerSetElement) => {
+ for (const workerSetElement of this.workerSet) {
if (workerSetElement.worker.threadId === worker.threadId) {
workerSetElt = workerSetElement;
+ break;
}
- });
+ }
return workerSetElt;
}
}