src/worker/WorkerFactory.ts

   1 import { Worker, isMainThread } from 'worker_threads';
   2
   3 import type { PoolOptions } from 'poolifier';
   4
   5 import { WorkerData, WorkerOptions, WorkerProcessType } from '../types/Worker';
   6 import type WorkerAbstract from './WorkerAbstract';
   7 import WorkerConstants from './WorkerConstants';
   8 import WorkerDynamicPool from './WorkerDynamicPool';
   9 import WorkerSet from './WorkerSet';
  10 import WorkerStaticPool from './WorkerStaticPool';
  11
  12 export default class WorkerFactory {
  13   private constructor() {
  14     // This is intentional
  15   }
  16
  17   public static getWorkerImplementation<T extends WorkerData>(
  18     workerScript: string,
  19     workerProcessType: WorkerProcessType,
  20     workerOptions?: WorkerOptions
  21   ): WorkerAbstract<T> | null {
  22     if (!isMainThread) {
  23       throw new Error('Cannot get a worker implementation outside the main thread');
  24     }
  25     workerOptions = workerOptions ?? ({} as WorkerOptions);
  26     workerOptions.workerStartDelay =
  27       workerOptions?.workerStartDelay ?? WorkerConstants.DEFAULT_WORKER_START_DELAY;
  28     workerOptions.elementStartDelay =
  29       workerOptions?.elementStartDelay ?? WorkerConstants.DEFAULT_ELEMENT_START_DELAY;
  30     workerOptions.poolOptions = workerOptions?.poolOptions ?? ({} as PoolOptions<Worker>);
  31     workerOptions?.messageHandler &&
  32       // eslint-disable-next-line @typescript-eslint/no-misused-promises
  33       (workerOptions.poolOptions.messageHandler = workerOptions.messageHandler);
  34     let workerImplementation: WorkerAbstract<T> = null;
  35     switch (workerProcessType) {
  36       case WorkerProcessType.WORKER_SET:
  37         workerOptions.elementsPerWorker =
  38           workerOptions?.elementsPerWorker ?? WorkerConstants.DEFAULT_ELEMENTS_PER_WORKER;
  39         workerImplementation = new WorkerSet(workerScript, workerOptions);
  40         break;
  41       case WorkerProcessType.STATIC_POOL:
  42         workerOptions.poolMaxSize =
  43           workerOptions?.poolMaxSize ?? WorkerConstants.DEFAULT_POOL_MAX_SIZE;
  44         workerImplementation = new WorkerStaticPool(workerScript, workerOptions);
  45         break;
  46       case WorkerProcessType.DYNAMIC_POOL:
  47         workerOptions.poolMinSize =
  48           workerOptions?.poolMinSize ?? WorkerConstants.DEFAULT_POOL_MIN_SIZE;
  49         workerOptions.poolMaxSize =
  50           workerOptions?.poolMaxSize ?? WorkerConstants.DEFAULT_POOL_MAX_SIZE;
  51         workerImplementation = new WorkerDynamicPool(workerScript, workerOptions);
  52         break;
  53       default:
  54         // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
  55         throw new Error(`Worker implementation type '${workerProcessType}' not found`);
  56     }
  57     return workerImplementation;
  58   }
  59 }