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<D extends WorkerData, R extends WorkerData> extends WorkerAbstract<
  10 D,
  11 R
  12 > {
  13   private readonly pool: FixedThreadPool<D, R>
  14
  15   /**
  16    * Creates a new `WorkerFixedPool`.
  17    *
  18    * @param workerScript -
  19    * @param workerOptions -
  20    */
  21   constructor (workerScript: string, workerOptions: WorkerOptions) {
  22     super(workerScript, workerOptions)
  23     this.pool = new FixedThreadPool<D, R>(
  24       this.workerOptions.poolMaxSize,
  25       this.workerScript,
  26       this.workerOptions.poolOptions
  27     )
  28   }
  29
  30   get info (): PoolInfo {
  31     return this.pool.info
  32   }
  33
  34   get size (): number {
  35     return this.pool.info.workerNodes
  36   }
  37
  38   get maxElementsPerWorker (): number | undefined {
  39     return undefined
  40   }
  41
  42   get emitter (): EventEmitterAsyncResource | undefined {
  43     return this.pool.emitter
  44   }
  45
  46   /** @inheritDoc */
  47   public start (): void {
  48     this.pool.start()
  49   }
  50
  51   /** @inheritDoc */
  52   public async stop (): Promise<void> {
  53     await this.pool.destroy()
  54   }
  55
  56   /** @inheritDoc */
  57   public async addElement (elementData: D): Promise<R> {
  58     const response = await this.pool.execute(elementData)
  59     // Start element sequentially to optimize memory at startup
  60     // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
  61     this.workerOptions.elementAddDelay! > 0 &&
  62       // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
  63       (await sleep(randomizeDelay(this.workerOptions.elementAddDelay!)))
  64     return response
  65   }
  66 }