src/worker/WorkerStaticPool.ts

   1 import { FixedThreadPool } from 'poolifier';
   2
   3 import type { WorkerData, WorkerOptions } from '../types/Worker';
   4 import Utils from '../utils/Utils';
   5 import WorkerAbstract from './WorkerAbstract';
   6 import { WorkerUtils } from './WorkerUtils';
   7
   8 export default class WorkerStaticPool extends WorkerAbstract<WorkerData> {
   9   private readonly pool: FixedThreadPool<WorkerData>;
  10
  11   /**
  12    * Create a new `WorkerStaticPool`.
  13    *
  14    * @param workerScript
  15    * @param workerOptions
  16    */
  17   constructor(workerScript: string, workerOptions?: WorkerOptions) {
  18     super(workerScript, workerOptions);
  19     this.workerOptions.poolOptions.errorHandler =
  20       this.workerOptions?.poolOptions?.errorHandler ?? WorkerUtils.defaultErrorHandler;
  21     this.workerOptions.poolOptions.exitHandler =
  22       this.workerOptions?.poolOptions?.exitHandler ?? WorkerUtils.defaultExitHandler;
  23     this.pool = new FixedThreadPool(
  24       this.workerOptions.poolMaxSize,
  25       this.workerScript,
  26       this.workerOptions.poolOptions
  27     );
  28   }
  29
  30   get size(): number {
  31     return this.pool.workers.length;
  32   }
  33
  34   get maxElementsPerWorker(): number | null {
  35     return null;
  36   }
  37
  38   /**
  39    *
  40    * @returns
  41    * @public
  42    */
  43   public async start(): Promise<void> {
  44     // This is intentional
  45   }
  46
  47   /**
  48    *
  49    * @returns
  50    * @public
  51    */
  52   public async stop(): Promise<void> {
  53     return this.pool.destroy();
  54   }
  55
  56   /**
  57    *
  58    * @param elementData
  59    * @returns
  60    * @public
  61    */
  62   public async addElement(elementData: WorkerData): Promise<void> {
  63     await this.pool.execute(elementData);
  64     // Start element sequentially to optimize memory at startup
  65     this.workerOptions.elementStartDelay > 0 &&
  66       (await Utils.sleep(this.workerOptions.elementStartDelay));
  67   }
  68 }