src/worker/WorkerFactory.ts

   1 import { Worker, isMainThread } from 'worker_threads';
   2 import { WorkerOptions, WorkerProcessType } from '../types/Worker';
   3
   4 import Constants from '../utils/Constants';
   5 import { PoolOptions } from 'poolifier';
   6 import WorkerAbstract from './WorkerAbstract';
   7 import WorkerDynamicPool from './WorkerDynamicPool';
   8 import WorkerSet from './WorkerSet';
   9 import WorkerStaticPool from './WorkerStaticPool';
  10
  11 export default class WorkerFactory {
  12   // eslint-disable-next-line @typescript-eslint/no-empty-function
  13   private constructor() {
  14     // This is intentional
  15   }
  16
  17   public static getWorkerImplementation<T>(workerScript: string, workerProcessType: WorkerProcessType, options?: WorkerOptions): WorkerAbstract | null {
  18     if (!isMainThread) {
  19       throw new Error('Trying to get a worker implementation outside the main thread');
  20     }
  21     options = options ?? {} as WorkerOptions;
  22     options.startDelay = options.startDelay ?? Constants.WORKER_START_DELAY;
  23     options.poolOptions = options?.poolOptions ?? {} as PoolOptions<Worker>;
  24     // options?.messageHandler && options.poolOptions.messageHandler = options.messageHandler;
  25     let workerImplementation: WorkerAbstract = null;
  26     switch (workerProcessType) {
  27       case WorkerProcessType.WORKER_SET:
  28         options.elementsPerWorker = options.elementsPerWorker ?? Constants.DEFAULT_CHARGING_STATIONS_PER_WORKER;
  29         workerImplementation = new WorkerSet<T>(workerScript, options.elementsPerWorker, options.startDelay, options);
  30         break;
  31       case WorkerProcessType.STATIC_POOL:
  32         options.poolMaxSize = options.poolMaxSize ?? Constants.DEFAULT_WORKER_POOL_MAX_SIZE;
  33         workerImplementation = new WorkerStaticPool<T>(workerScript, options.poolMaxSize, options.startDelay, options.poolOptions);
  34         break;
  35       case WorkerProcessType.DYNAMIC_POOL:
  36         options.poolMinSize = options.poolMinSize ?? Constants.DEFAULT_WORKER_POOL_MIN_SIZE;
  37         options.poolMaxSize = options.poolMaxSize ?? Constants.DEFAULT_WORKER_POOL_MAX_SIZE;
  38         workerImplementation = new WorkerDynamicPool<T>(workerScript, options.poolMinSize, options.poolMaxSize, options.startDelay, options.poolOptions);
  39         break;
  40       default:
  41         throw new Error(`Worker implementation type '${workerProcessType}' not found`);
  42     }
  43     return workerImplementation;
  44   }
  45 }