src/worker/thread-worker.ts

   1 import { isMainThread, parentPort } from 'worker_threads'
   2 import type { MessageValue } from '../utility-types'
   3 import { AbstractWorker } from './abstract-worker'
   4 import type { WorkerOptions } from './worker-options'
   5
   6 /**
   7  * An example worker that will be always alive, you just need to **extend** this class if you want a static pool.
   8  *
   9  * When this worker is inactive for more than 1 minute, it will send this info to the main thread,
  10  * if you are using DynamicThreadPool, the workers created after will be killed, the min num of thread will be guaranteed.
  11  *
  12  * @author [Alessandro Pio Ardizio](https://github.com/pioardi)
  13  * @since 0.0.1
  14  */
  15 // eslint-disable-next-line @typescript-eslint/no-explicit-any
  16 export class ThreadWorker<Data = any, Response = any> extends AbstractWorker<
  17   MessagePort,
  18   Data,
  19   Response
  20 > {
  21   protected parent?: MessagePort
  22
  23   public constructor (fn: (data: Data) => Response, opts: WorkerOptions = {}) {
  24     super('worker-thread-pool:pioardi', isMainThread, fn, opts)
  25
  26     parentPort?.on('message', (value: MessageValue<Data>) => {
  27       if (value?.data && value.id) {
  28         // here you will receive messages
  29         // console.log('This is the main worker ' + isMain)
  30         if (this.async) {
  31           this.runInAsyncScope(this.runAsync.bind(this), this, fn, value)
  32         } else {
  33           this.runInAsyncScope(this.run.bind(this), this, fn, value)
  34         }
  35       } else if (value.parent) {
  36         // save the port to communicate with the main thread
  37         // this will be received once
  38         this.parent = value.parent
  39       } else if (value.kill) {
  40         // here is time to kill this worker, just clearing the interval
  41         if (this.interval) clearInterval(this.interval)
  42         this.emitDestroy()
  43       }
  44     })
  45   }
  46
  47   protected getMainWorker (): MessagePort {
  48     if (!this.parent) {
  49       throw new Error('Parent was not set')
  50     }
  51     return this.parent
  52   }
  53
  54   protected sendToMainWorker (message: MessageValue<Response>): void {
  55     this.getMainWorker().postMessage(message)
  56   }
  57 }