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>(
  17     workerScript: string,
  18     workerProcessType: WorkerProcessType,
  19     workerOptions?: WorkerOptions
  20   ): WorkerAbstract<T> | null {
  21     if (!isMainThread) {
  22       throw new Error('Trying to get a worker implementation outside the main thread');
  23     }
  24     workerOptions = workerOptions ?? ({} as WorkerOptions);
  25     workerOptions.workerStartDelay =
  26       workerOptions?.workerStartDelay ?? Constants.WORKER_START_DELAY;
  27     workerOptions.elementStartDelay =
  28       workerOptions?.elementStartDelay ?? Constants.ELEMENT_START_DELAY;
  29     workerOptions.poolOptions = workerOptions?.poolOptions ?? ({} as PoolOptions<Worker>);
  30     workerOptions?.messageHandler &&
  31       (workerOptions.poolOptions.messageHandler = workerOptions.messageHandler);
  32     let workerImplementation: WorkerAbstract<T> = null;
  33     switch (workerProcessType) {
  34       case WorkerProcessType.WORKER_SET:
  35         workerOptions.elementsPerWorker =
  36           workerOptions?.elementsPerWorker ?? Constants.DEFAULT_CHARGING_STATIONS_PER_WORKER;
  37         workerImplementation = new WorkerSet(workerScript, workerOptions);
  38         break;
  39       case WorkerProcessType.STATIC_POOL:
  40         workerOptions.poolMaxSize =
  41           workerOptions?.poolMaxSize ?? Constants.DEFAULT_WORKER_POOL_MAX_SIZE;
  42         workerImplementation = new WorkerStaticPool(workerScript, workerOptions);
  43         break;
  44       case WorkerProcessType.DYNAMIC_POOL:
  45         workerOptions.poolMinSize =
  46           workerOptions?.poolMinSize ?? Constants.DEFAULT_WORKER_POOL_MIN_SIZE;
  47         workerOptions.poolMaxSize =
  48           workerOptions?.poolMaxSize ?? Constants.DEFAULT_WORKER_POOL_MAX_SIZE;
  49         workerImplementation = new WorkerDynamicPool(workerScript, workerOptions);
  50         break;
  51       default:
  52         throw new Error(`Worker implementation type '${workerProcessType}' not found`);
  53     }
  54     return workerImplementation;
  55   }
  56 }