src/worker/WorkerFactory.ts

   1 import { Worker, isMainThread } from 'worker_threads';
   2 import { WorkerData, WorkerOptions, WorkerProcessType } from '../types/Worker';
   3
   4 import Constants from '../utils/Constants';
   5 import { PoolOptions } from 'poolifier';
   6 import type 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   private constructor() {
  13     // This is intentional
  14   }
  15
  16   public static getWorkerImplementation<T extends WorkerData>(workerScript: string, workerProcessType: WorkerProcessType, options?: WorkerOptions): WorkerAbstract<T> | null {
  17     if (!isMainThread) {
  18       throw new Error('Trying to get a worker implementation outside the main thread');
  19     }
  20     options = options ?? {} as WorkerOptions;
  21     options.startDelay = options?.startDelay ?? Constants.WORKER_START_DELAY;
  22     options.poolOptions = options?.poolOptions ?? {} as PoolOptions<Worker>;
  23     options?.messageHandler && (options.poolOptions.messageHandler = options.messageHandler);
  24     let workerImplementation: WorkerAbstract<T> = null;
  25     switch (workerProcessType) {
  26       case WorkerProcessType.WORKER_SET:
  27         options.elementsPerWorker = options.elementsPerWorker ?? Constants.DEFAULT_CHARGING_STATIONS_PER_WORKER;
  28         workerImplementation = new WorkerSet(workerScript, options.elementsPerWorker, options.startDelay, options);
  29         break;
  30       case WorkerProcessType.STATIC_POOL:
  31         options.poolMaxSize = options.poolMaxSize ?? Constants.DEFAULT_WORKER_POOL_MAX_SIZE;
  32         workerImplementation = new WorkerStaticPool(workerScript, options.poolMaxSize, options.startDelay, options.poolOptions);
  33         break;
  34       case WorkerProcessType.DYNAMIC_POOL:
  35         options.poolMinSize = options.poolMinSize ?? Constants.DEFAULT_WORKER_POOL_MIN_SIZE;
  36         options.poolMaxSize = options.poolMaxSize ?? Constants.DEFAULT_WORKER_POOL_MAX_SIZE;
  37         workerImplementation = new WorkerDynamicPool(workerScript, options.poolMinSize, options.poolMaxSize, options.startDelay, options.poolOptions);
  38         break;
  39       default:
  40         throw new Error(`Worker implementation type '${workerProcessType}' not found`);
  41     }
  42     return workerImplementation;
  43   }
  44 }