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dynamic.ts
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dynamic.ts
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import { PoolEvents, type PoolType, PoolTypes } from '../pool.js'
import { checkDynamicPoolSize } from '../utils.js'
import { type ClusterPoolOptions, FixedClusterPool } from './fixed.js'
/**
* A cluster pool with a dynamic number of workers, but a guaranteed minimum number of workers.
*
* This cluster pool creates new workers when the others are busy, up to the maximum number of workers.
* 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`.
* @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
* @typeParam Response - Type of execution response. This can only be structured-cloneable data.
* @author [Christopher Quadflieg](https://github.com/Shinigami92)
* @since 2.0.0
*/
export class DynamicClusterPool<
Data = unknown,
Response = unknown
> extends FixedClusterPool<Data, Response> {
/**
* Constructs a new poolifier dynamic cluster pool.
* @param min - Minimum number of workers which are always active.
* @param max - Maximum number of workers that can be created by this pool.
* @param filePath - Path to an implementation of a `ClusterWorker` file, which can be relative or absolute.
* @param opts - Options for this dynamic cluster pool.
*/
public constructor (
min: number,
max: number,
filePath: string,
opts: ClusterPoolOptions = {}
) {
super(min, filePath, opts, max)
checkDynamicPoolSize(
this.minimumNumberOfWorkers,
this.maximumNumberOfWorkers
)
}
/** @inheritDoc */
protected shallCreateDynamicWorker (): boolean {
return (!this.full && this.internalBusy()) || this.empty
}
/** @inheritDoc */
protected checkAndEmitDynamicWorkerCreationEvents (): void {
if (this.full) {
this.emitter?.emit(PoolEvents.full, this.info)
}
}
/** @inheritDoc */
protected get type (): PoolType {
return PoolTypes.dynamic
}
/** @inheritDoc */
protected get busy (): boolean {
return this.full && this.internalBusy()
}
}