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.workerStartDelay = options?.workerStartDelay ?? Constants.WORKER_START_DELAY;
  22     options.elementStartDelay = options?.elementStartDelay ?? Constants.ELEMENT_START_DELAY;
  23     options.poolOptions = options?.poolOptions ?? {} as PoolOptions<Worker>;
  24     options?.messageHandler && (options.poolOptions.messageHandler = options.messageHandler);
  25     let workerImplementation: WorkerAbstract<T> = null;
  26     switch (workerProcessType) {
  27       case WorkerProcessType.WORKER_SET:
  28         options.elementsPerWorker = options.elementsPerWorker ?? Constants.DEFAULT_CHARGING_STATIONS_PER_WORKER;
  29         workerImplementation = new WorkerSet(workerScript, options.elementsPerWorker,
  30           {
  31             workerStartDelay: options.workerStartDelay,
  32             elementStartDelay: options.elementStartDelay
  33           },
  34           options);
  35         break;
  36       case WorkerProcessType.STATIC_POOL:
  37         options.poolMaxSize = options.poolMaxSize ?? Constants.DEFAULT_WORKER_POOL_MAX_SIZE;
  38         workerImplementation = new WorkerStaticPool(workerScript, options.poolMaxSize,
  39           {
  40             workerStartDelay: options.workerStartDelay,
  41             elementStartDelay: options.elementStartDelay
  42           },
  43           options.poolOptions);
  44         break;
  45       case WorkerProcessType.DYNAMIC_POOL:
  46         options.poolMinSize = options.poolMinSize ?? Constants.DEFAULT_WORKER_POOL_MIN_SIZE;
  47         options.poolMaxSize = options.poolMaxSize ?? Constants.DEFAULT_WORKER_POOL_MAX_SIZE;
  48         workerImplementation = new WorkerDynamicPool(workerScript, options.poolMinSize, options.poolMaxSize,
  49           {
  50             workerStartDelay: options.workerStartDelay,
  51             elementStartDelay: options.elementStartDelay
  52           },
  53           options.poolOptions);
  54         break;
  55       default:
  56         throw new Error(`Worker implementation type '${workerProcessType}' not found`);
  57     }
  58     return workerImplementation;
  59   }
  60 }