src/pools/thread/dynamic.ts

   1 import { type PoolType, PoolTypes } from '../pool'
   2 import { FixedThreadPool, type ThreadPoolOptions } from './fixed'
   3
   4 /**
   5  * A thread pool with a dynamic number of threads, but a guaranteed minimum number of threads.
   6  *
   7  * This thread pool creates new threads when the others are busy, up to the maximum number of threads.
   8  * When the maximum number of threads is reached and workers are busy, an event is emitted. If you want to listen to this event, use the pool's `emitter`.
   9  *
  10  * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
  11  * @typeParam Response - Type of execution response. This can only be structured-cloneable data.
  12  * @author [Alessandro Pio Ardizio](https://github.com/pioardi)
  13  * @since 0.0.1
  14  */
  15 export class DynamicThreadPool<
  16   Data = unknown,
  17   Response = unknown
  18 > extends FixedThreadPool<Data, Response> {
  19   /**
  20    * Constructs a new poolifier dynamic thread pool.
  21    *
  22    * @param min - Minimum number of threads which are always active.
  23    * @param max - Maximum number of threads that can be created by this pool.
  24    * @param filePath - Path to an implementation of a `ThreadWorker` file, which can be relative or absolute.
  25    * @param opts - Options for this dynamic thread pool.
  26    */
  27   public constructor (
  28     min: number,
  29     protected readonly max: number,
  30     filePath: string,
  31     opts: ThreadPoolOptions = {}
  32   ) {
  33     super(min, filePath, opts)
  34     this.checkDynamicPoolSize(this.numberOfWorkers, this.max)
  35   }
  36
  37   /** @inheritDoc */
  38   protected get type (): PoolType {
  39     return PoolTypes.dynamic
  40   }
  41
  42   /** @inheritDoc */
  43   protected get maxSize (): number {
  44     return this.max
  45   }
  46
  47   /** @inheritDoc */
  48   protected get busy (): boolean {
  49     return this.full && this.internalBusy()
  50   }
  51 }