src/pools/cluster/dynamic.ts

   1 import { checkDynamicPoolSize } from '../utils.js'
   2 import { PoolEvents, type PoolType, PoolTypes } from '../pool.js'
   3 import { type ClusterPoolOptions, FixedClusterPool } from './fixed.js'
   4
   5 /**
   6  * A cluster pool with a dynamic number of workers, but a guaranteed minimum number of workers.
   7  *
   8  * This cluster pool creates new workers when the others are busy, up to the maximum number of workers.
   9  * When the maximum number of workers is reached and workers are busy, an event is emitted. If you want to listen to this event, use the pool's `emitter`.
  10  *
  11  * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
  12  * @typeParam Response - Type of execution response. This can only be structured-cloneable data.
  13  * @author [Christopher Quadflieg](https://github.com/Shinigami92)
  14  * @since 2.0.0
  15  */
  16 export class DynamicClusterPool<
  17   Data = unknown,
  18   Response = unknown
  19 > extends FixedClusterPool<Data, Response> {
  20   /**
  21    * Constructs a new poolifier dynamic cluster pool.
  22    *
  23    * @param min - Minimum number of workers which are always active.
  24    * @param max - Maximum number of workers that can be created by this pool.
  25    * @param filePath - Path to an implementation of a `ClusterWorker` file, which can be relative or absolute.
  26    * @param opts - Options for this dynamic cluster pool.
  27    */
  28   public constructor (
  29     min: number,
  30     max: number,
  31     filePath: string,
  32     opts: ClusterPoolOptions = {}
  33   ) {
  34     super(min, filePath, opts, max)
  35     checkDynamicPoolSize(
  36       this.minimumNumberOfWorkers,
  37       this.maximumNumberOfWorkers as number
  38     )
  39   }
  40
  41   /** @inheritDoc */
  42   protected shallCreateDynamicWorker (): boolean {
  43     return !this.full && this.internalBusy()
  44   }
  45
  46   /** @inheritDoc */
  47   protected checkAndEmitDynamicWorkerCreationEvents (): void {
  48     if (this.full) {
  49       this.emitter?.emit(PoolEvents.full, this.info)
  50     }
  51   }
  52
  53   /** @inheritDoc */
  54   protected get type (): PoolType {
  55     return PoolTypes.dynamic
  56   }
  57
  58   /** @inheritDoc */
  59   protected get busy (): boolean {
  60     return this.full && this.internalBusy()
  61   }
  62 }