src/worker/thread-worker.ts

   1 import {
   2   type MessagePort,
   3   isMainThread,
   4   parentPort,
   5   threadId
   6 } from 'node:worker_threads'
   7 import type { MessageValue } from '../utility-types'
   8 import { AbstractWorker } from './abstract-worker'
   9 import type { WorkerOptions } from './worker-options'
  10 import type { TaskFunctions, WorkerFunction } from './worker-functions'
  11
  12 /**
  13  * A thread worker used by a poolifier `ThreadPool`.
  14  *
  15  * When this worker is inactive for more than the given `maxInactiveTime`,
  16  * it will send a termination request to its main thread.
  17  *
  18  * If you use a `DynamicThreadPool` the extra workers that were created will be terminated,
  19  * but the minimum number of workers will be guaranteed.
  20  *
  21  * @typeParam Data - Type of data this worker receives from pool's execution. This can only be structured-cloneable data.
  22  * @typeParam Response - Type of response the worker sends back to the main thread. This can only be structured-cloneable data.
  23  * @author [Alessandro Pio Ardizio](https://github.com/pioardi)
  24  * @since 0.0.1
  25  */
  26 export class ThreadWorker<
  27   Data = unknown,
  28   Response = unknown
  29 > extends AbstractWorker<MessagePort, Data, Response> {
  30   /**
  31    * Constructs a new poolifier thread worker.
  32    *
  33    * @param taskFunctions - Task function(s) processed by the worker when the pool's `execution` function is invoked.
  34    * @param opts - Options for the worker.
  35    */
  36   public constructor (
  37     taskFunctions:
  38     | WorkerFunction<Data, Response>
  39     | TaskFunctions<Data, Response>,
  40     opts: WorkerOptions = {}
  41   ) {
  42     super(
  43       'worker-thread-pool:poolifier',
  44       isMainThread,
  45       taskFunctions,
  46       parentPort as MessagePort,
  47       opts
  48     )
  49     if (!this.isMain) {
  50       this.sendToMainWorker({ workerId: this.id, started: true })
  51     }
  52   }
  53
  54   protected get id (): number {
  55     return threadId
  56   }
  57
  58   /** @inheritDoc */
  59   protected sendToMainWorker (message: MessageValue<Response>): void {
  60     console.log('sending message to main worker(thread)', message)
  61     this.getMainWorker().postMessage(message)
  62   }
  63 }