src/pools/thread/dynamic.ts

   1 import type { PoolOptions } from '../pool'
   2 import { PoolType } from '../pool'
   3 import type { ThreadWorkerWithMessageChannel } from './fixed'
   4 import { FixedThreadPool } from './fixed'
   5
   6 /**
   7  * A thread pool with a dynamic number of threads, but a guaranteed minimum number of threads.
   8  *
   9  * This thread pool creates new threads when the others are busy, up to the maximum number of threads.
  10  * 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`.
  11  *
  12  * @typeParam Data - Type of data sent to the worker. This can only be serializable data.
  13  * @typeParam Response - Type of execution response. This can only be serializable data.
  14  * @author [Alessandro Pio Ardizio](https://github.com/pioardi)
  15  * @since 0.0.1
  16  */
  17 export class DynamicThreadPool<
  18   Data = unknown,
  19   Response = unknown
  20 > extends FixedThreadPool<Data, Response> {
  21   /**
  22    * Constructs a new poolifier dynamic thread pool.
  23    *
  24    * @param min - Minimum number of threads which are always active.
  25    * @param max - Maximum number of threads that can be created by this pool.
  26    * @param filePath - Path to an implementation of a `ThreadWorker` file, which can be relative or absolute.
  27    * @param opts - Options for this dynamic thread pool.
  28    */
  29   public constructor (
  30     min: number,
  31     public readonly max: number,
  32     filePath: string,
  33     opts: PoolOptions<ThreadWorkerWithMessageChannel> = {}
  34   ) {
  35     super(min, filePath, opts)
  36   }
  37
  38   /** @inheritDoc */
  39   public get type (): PoolType {
  40     return PoolType.DYNAMIC
  41   }
  42
  43   /** @inheritDoc */
  44   protected get full (): boolean {
  45     return this.workerNodes.length >= this.max
  46   }
  47
  48   /** @inheritDoc */
  49   public get size (): number {
  50     return this.max
  51   }
  52
  53   /** @inheritDoc */
  54   protected get busy (): boolean {
  55     return this.full && this.internalBusy()
  56   }
  57 }