src/worker/WorkerStaticPool.ts

   1 import type { Worker } from 'worker_threads';
   2
   3 import { type ErrorHandler, type ExitHandler, FixedThreadPool } from 'poolifier';
   4
   5 import WorkerAbstract from './WorkerAbstract';
   6 import { WorkerUtils } from './WorkerUtils';
   7 import type { WorkerData, WorkerOptions } from '../types/Worker';
   8 import Utils from '../utils/Utils';
   9
  10 export default class WorkerStaticPool extends WorkerAbstract<WorkerData> {
  11   private readonly pool: FixedThreadPool<WorkerData>;
  12
  13   /**
  14    * Create a new `WorkerStaticPool`.
  15    *
  16    * @param workerScript -
  17    * @param workerOptions -
  18    */
  19   constructor(workerScript: string, workerOptions?: WorkerOptions) {
  20     super(workerScript, workerOptions);
  21     this.workerOptions.poolOptions.errorHandler = (
  22       this.workerOptions?.poolOptions?.errorHandler ?? WorkerUtils.defaultErrorHandler
  23     ).bind(this) as ErrorHandler<Worker>;
  24     this.workerOptions.poolOptions.exitHandler = (
  25       this.workerOptions?.poolOptions?.exitHandler ?? WorkerUtils.defaultExitHandler
  26     ).bind(this) as ExitHandler<Worker>;
  27     this.workerOptions.poolOptions.messageHandler.bind(this);
  28     this.pool = new FixedThreadPool(
  29       this.workerOptions.poolMaxSize,
  30       this.workerScript,
  31       this.workerOptions.poolOptions
  32     );
  33   }
  34
  35   get size(): number {
  36     return this.pool.workers.length;
  37   }
  38
  39   get maxElementsPerWorker(): number | null {
  40     return null;
  41   }
  42
  43   /**
  44    *
  45    * @returns
  46    * @public
  47    */
  48   public async start(): Promise<void> {
  49     // This is intentional
  50   }
  51
  52   /**
  53    *
  54    * @returns
  55    * @public
  56    */
  57   public async stop(): Promise<void> {
  58     return this.pool.destroy();
  59   }
  60
  61   /**
  62    *
  63    * @param elementData -
  64    * @returns
  65    * @public
  66    */
  67   public async addElement(elementData: WorkerData): Promise<void> {
  68     await this.pool.execute(elementData);
  69     // Start element sequentially to optimize memory at startup
  70     this.workerOptions.elementStartDelay > 0 &&
  71       (await Utils.sleep(this.workerOptions.elementStartDelay));
  72   }
  73 }