Merge dependabot/npm_and_yarn/examples/typescript/http-server-pool/fastify-cluster...
[poolifier.git] / src / pools / thread / dynamic.ts
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d0878034 1import { PoolEvents, type PoolType, PoolTypes } from '../pool'
bde6b5d7 2import { checkDynamicPoolSize } from '../utils'
2889bd70 3import { FixedThreadPool, type ThreadPoolOptions } from './fixed'
f045358d 4
4ade5f1f 5/**
729c563d 6 * A thread pool with a dynamic number of threads, but a guaranteed minimum number of threads.
4ade5f1f 7 *
729c563d 8 * This thread pool creates new threads when the others are busy, up to the maximum number of threads.
9cd39dd4 9 * 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`.
729c563d 10 *
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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.
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13 * @author [Alessandro Pio Ardizio](https://github.com/pioardi)
14 * @since 0.0.1
15 */
60fbd6d6 16export class DynamicThreadPool<
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17 Data = unknown,
18 Response = unknown
4ade5f1f 19> extends FixedThreadPool<Data, Response> {
4ade5f1f 20 /**
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21 * Constructs a new poolifier dynamic thread pool.
22 *
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23 * @param min - Minimum number of threads which are always active.
24 * @param max - Maximum number of threads that can be created by this pool.
25 * @param filePath - Path to an implementation of a `ThreadWorker` file, which can be relative or absolute.
26 * @param opts - Options for this dynamic thread pool.
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27 */
28 public constructor (
c97c7edb 29 min: number,
26ce26ca 30 max: number,
31b90205 31 filePath: string,
2889bd70 32 opts: ThreadPoolOptions = {}
4ade5f1f 33 ) {
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34 super(min, filePath, opts, max)
35 checkDynamicPoolSize(
36 this.minimumNumberOfWorkers,
37 this.maximumNumberOfWorkers as number
38 )
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39 }
40
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41 /** @inheritDoc */
42 protected shallCreateDynamicWorker (): boolean {
43 return !this.full && this.internalBusy()
44 }
45
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46 /** @inheritDoc */
47 protected checkAndEmitDynamicWorkerCreationEvents (): void {
48 if (this.full) {
49 this.emitter?.emit(PoolEvents.full, this.info)
50 }
51 }
52
afc003b2 53 /** @inheritDoc */
8881ae32 54 protected get type (): PoolType {
6b27d407 55 return PoolTypes.dynamic
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56 }
57
afc003b2 58 /** @inheritDoc */
c319c66b 59 protected get busy (): boolean {
0527b6db 60 return this.full && this.internalBusy()
c2ade475 61 }
4ade5f1f 62}