src/worker/WorkerFactory.ts

   1 import { isMainThread } from 'node:worker_threads'
   2
   3 import type { WorkerAbstract } from './WorkerAbstract.js'
   4 import { DEFAULT_WORKER_OPTIONS } from './WorkerConstants.js'
   5 import { WorkerDynamicPool } from './WorkerDynamicPool.js'
   6 import { WorkerFixedPool } from './WorkerFixedPool.js'
   7 import { WorkerSet } from './WorkerSet.js'
   8 import { type WorkerData, type WorkerOptions, WorkerProcessType } from './WorkerTypes.js'
   9
  10 // eslint-disable-next-line @typescript-eslint/no-extraneous-class
  11 export class WorkerFactory {
  12   private constructor () {
  13     // This is intentional
  14   }
  15
  16   public static getWorkerImplementation<T extends WorkerData>(
  17     workerScript: string,
  18     workerProcessType: WorkerProcessType,
  19     workerOptions?: WorkerOptions
  20   ): WorkerAbstract<T> | undefined {
  21     if (!isMainThread) {
  22       throw new Error('Cannot get a worker implementation outside the main thread')
  23     }
  24     workerOptions = { ...DEFAULT_WORKER_OPTIONS, ...workerOptions }
  25     let workerImplementation: WorkerAbstract<T>
  26     switch (workerProcessType) {
  27       case WorkerProcessType.workerSet:
  28         workerImplementation = new WorkerSet(workerScript, workerOptions)
  29         break
  30       case WorkerProcessType.fixedPool:
  31         workerImplementation = new WorkerFixedPool(workerScript, workerOptions)
  32         break
  33       case WorkerProcessType.dynamicPool:
  34         workerImplementation = new WorkerDynamicPool(workerScript, workerOptions)
  35         break
  36       default:
  37         // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
  38         throw new Error(`Worker implementation type '${workerProcessType}' not found`)
  39     }
  40     return workerImplementation
  41   }
  42 }