src/worker/WorkerFixedPool.ts

   1 import type { EventEmitterAsyncResource } from 'node:events';
   2
   3 import { FixedThreadPool, type PoolInfo } from 'poolifier';
   4
   5 import { WorkerAbstract } from './WorkerAbstract.js';
   6 import type { WorkerData, WorkerOptions } from './WorkerTypes.js';
   7 import { randomizeDelay, sleep } from './WorkerUtils.js';
   8
   9 export class WorkerFixedPool extends WorkerAbstract<WorkerData> {
  10   private readonly pool: FixedThreadPool<WorkerData>;
  11
  12   /**
  13    * Creates a new `WorkerFixedPool`.
  14    *
  15    * @param workerScript -
  16    * @param workerOptions -
  17    */
  18   constructor(workerScript: string, workerOptions: WorkerOptions) {
  19     super(workerScript, workerOptions);
  20     this.pool = new FixedThreadPool(
  21       this.workerOptions.poolMaxSize,
  22       this.workerScript,
  23       this.workerOptions.poolOptions,
  24     );
  25   }
  26
  27   get info(): PoolInfo {
  28     return this.pool.info;
  29   }
  30
  31   get size(): number {
  32     return this.pool.info.workerNodes;
  33   }
  34
  35   get maxElementsPerWorker(): number | undefined {
  36     return undefined;
  37   }
  38
  39   get emitter(): EventEmitterAsyncResource | undefined {
  40     return this.pool?.emitter;
  41   }
  42
  43   /** @inheritDoc */
  44   public async start(): Promise<void> {
  45     // This is intentional
  46   }
  47
  48   /** @inheritDoc */
  49   public async stop(): Promise<void> {
  50     return this.pool.destroy();
  51   }
  52
  53   /** @inheritDoc */
  54   public async addElement(elementData: WorkerData): Promise<void> {
  55     await this.pool.execute(elementData);
  56     // Start element sequentially to optimize memory at startup
  57     this.workerOptions.elementStartDelay! > 0 &&
  58       (await sleep(randomizeDelay(this.workerOptions.elementStartDelay!)));
  59   }
  60 }