src/worker/WorkerFactory.ts

   1 import { WorkerOptions, WorkerProcessType } from '../types/Worker';
   2
   3 import Constants from '../utils/Constants';
   4 import WorkerAbstract from './WorkerAbstract';
   5 import WorkerDynamicPool from './WorkerDynamicPool';
   6 import WorkerSet from './WorkerSet';
   7 import WorkerStaticPool from './WorkerStaticPool';
   8 import { isMainThread } from 'worker_threads';
   9
  10 export default class WorkerFactory {
  11   // eslint-disable-next-line @typescript-eslint/no-empty-function
  12   private constructor() {
  13     // This is intentional
  14   }
  15
  16   public static getWorkerImplementation<T>(workerScript: string, workerProcessType: WorkerProcessType, options?: WorkerOptions,
  17       messageListenerCallback: (message: any) => void = () => { /* This is intentional */ }): 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     let workerImplementation: WorkerAbstract = null;
  24     switch (workerProcessType) {
  25       case WorkerProcessType.WORKER_SET:
  26         options.elementsPerWorker = options.elementsPerWorker ?? Constants.DEFAULT_CHARGING_STATIONS_PER_WORKER;
  27         workerImplementation = new WorkerSet<T>(workerScript, options.elementsPerWorker, options.startDelay, messageListenerCallback);
  28         break;
  29       case WorkerProcessType.STATIC_POOL:
  30         options.poolMaxSize = options.poolMaxSize ?? Constants.DEFAULT_WORKER_POOL_MAX_SIZE;
  31         workerImplementation = new WorkerStaticPool<T>(workerScript, options.poolMaxSize, options.startDelay, options.poolOptions, messageListenerCallback);
  32         break;
  33       case WorkerProcessType.DYNAMIC_POOL:
  34         options.poolMinSize = options.poolMinSize ?? Constants.DEFAULT_WORKER_POOL_MIN_SIZE;
  35         options.poolMaxSize = options.poolMaxSize ?? Constants.DEFAULT_WORKER_POOL_MAX_SIZE;
  36         workerImplementation = new WorkerDynamicPool<T>(workerScript, options.poolMinSize, options.poolMaxSize, options.startDelay, options.poolOptions, messageListenerCallback);
  37         break;
  38       default:
  39         throw new Error(`Worker implementation type '${workerProcessType}' not found`);
  40     }
  41     return workerImplementation;
  42   }
  43 }