src/worker/WorkerFactory.ts

   1 import { isMainThread } from 'node:worker_threads'
   2
   3 import { mergeDeepRight } from 'rambda'
   4
   5 import type { WorkerAbstract } from './WorkerAbstract.js'
   6 import { DEFAULT_WORKER_OPTIONS } from './WorkerConstants.js'
   7 import { WorkerDynamicPool } from './WorkerDynamicPool.js'
   8 import { WorkerFixedPool } from './WorkerFixedPool.js'
   9 import { WorkerSet } from './WorkerSet.js'
  10 import { type WorkerData, type WorkerOptions, WorkerProcessType } from './WorkerTypes.js'
  11
  12 // eslint-disable-next-line @typescript-eslint/no-extraneous-class
  13 export class WorkerFactory {
  14   private constructor () {
  15     // This is intentional
  16   }
  17
  18   public static getWorkerImplementation<T extends WorkerData>(
  19     workerScript: string,
  20     workerProcessType: WorkerProcessType,
  21     workerOptions?: WorkerOptions
  22   ): WorkerAbstract<T> | undefined {
  23     if (!isMainThread) {
  24       throw new Error('Cannot get a worker implementation outside the main thread')
  25     }
  26     workerOptions = mergeDeepRight<WorkerOptions>(DEFAULT_WORKER_OPTIONS, workerOptions ?? {})
  27     let workerImplementation: WorkerAbstract<T>
  28     switch (workerProcessType) {
  29       case WorkerProcessType.workerSet:
  30         workerImplementation = new WorkerSet(workerScript, workerOptions)
  31         break
  32       case WorkerProcessType.fixedPool:
  33         workerImplementation = new WorkerFixedPool(workerScript, workerOptions)
  34         break
  35       case WorkerProcessType.dynamicPool:
  36         workerImplementation = new WorkerDynamicPool(workerScript, workerOptions)
  37         break
  38       default:
  39         // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
  40         throw new Error(`Worker implementation type '${workerProcessType}' not found`)
  41     }
  42     return workerImplementation
  43   }
  44 }