src/worker/WorkerStaticPool.ts

   1 import { FixedThreadPool } from 'poolifier';
   2
   3 import { 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.exitHandler =
  20       this.workerOptions?.poolOptions?.exitHandler ?? WorkerUtils.defaultExitHandler;
  21     this.pool = new FixedThreadPool(
  22       this.workerOptions.poolMaxSize,
  23       this.workerScript,
  24       this.workerOptions.poolOptions
  25     );
  26   }
  27
  28   get size(): number {
  29     return this.pool.workers.length;
  30   }
  31
  32   get maxElementsPerWorker(): number | null {
  33     return null;
  34   }
  35
  36   /**
  37    *
  38    * @returns
  39    * @public
  40    */
  41   public async start(): Promise<void> {
  42     // This is intentional
  43   }
  44
  45   /**
  46    *
  47    * @returns
  48    * @public
  49    */
  50   public async stop(): Promise<void> {
  51     return this.pool.destroy();
  52   }
  53
  54   /**
  55    *
  56    * @param elementData
  57    * @returns
  58    * @public
  59    */
  60   public async addElement(elementData: WorkerData): Promise<void> {
  61     await this.pool.execute(elementData);
  62     // Start element sequentially to optimize memory at startup
  63     this.workerOptions.elementStartDelay > 0 &&
  64       (await Utils.sleep(this.workerOptions.elementStartDelay));
  65   }
  66 }