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   private static workerImplementation: WorkerAbstract | null;
  12
  13   private constructor() {}
  14
  15   public static getWorkerImplementation<T>(workerScript: string, workerProcessType: WorkerProcessType, options?: WorkerOptions, forceInstantiation = false): WorkerAbstract | null {
  16     if (!isMainThread) {
  17       throw new Error('Trying to get a worker implementation outside the main thread');
  18     }
  19     if (!WorkerFactory.workerImplementation || forceInstantiation) {
  20       options = options ?? {} as WorkerOptions;
  21       options.startDelay = options.startDelay ?? Constants.WORKER_START_DELAY;
  22       WorkerFactory.workerImplementation = null;
  23       switch (workerProcessType) {
  24         case WorkerProcessType.WORKER_SET:
  25           options.elementsPerWorker = options.elementsPerWorker ?? Constants.DEFAULT_CHARGING_STATIONS_PER_WORKER;
  26           WorkerFactory.workerImplementation = new WorkerSet<T>(workerScript, options.elementsPerWorker, options.startDelay);
  27           break;
  28         case WorkerProcessType.STATIC_POOL:
  29           options.poolMaxSize = options.poolMaxSize ?? Constants.DEFAULT_WORKER_POOL_MAX_SIZE;
  30           WorkerFactory.workerImplementation = new WorkerStaticPool<T>(workerScript, options.poolMaxSize, options.startDelay, options.poolOptions);
  31           break;
  32         case WorkerProcessType.DYNAMIC_POOL:
  33           options.poolMinSize = options.poolMinSize ?? Constants.DEFAULT_WORKER_POOL_MIN_SIZE;
  34           options.poolMaxSize = options.poolMaxSize ?? Constants.DEFAULT_WORKER_POOL_MAX_SIZE;
  35           WorkerFactory.workerImplementation = new WorkerDynamicPool<T>(workerScript, options.poolMinSize, options.poolMaxSize, options.startDelay, options.poolOptions);
  36           break;
  37       }
  38     }
  39     return WorkerFactory.workerImplementation;
  40   }
  41 }