src/worker/WorkerDynamicPool.ts

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