Commit | Line | Data |
---|---|---|
c97c7edb | 1 | import type { Worker } from 'cluster' |
d3c8a1a8 | 2 | import type { JSONValue, MessageValue } from '../../utility-types' |
c97c7edb | 3 | import type { ClusterPoolOptions } from './fixed' |
325f50bc | 4 | import { FixedClusterPool } from './fixed' |
f045358d | 5 | |
4ade5f1f | 6 | /** |
325f50bc | 7 | * A cluster pool with a min/max number of workers, is possible to execute tasks in sync or async mode as you prefer. |
4ade5f1f | 8 | * |
325f50bc S |
9 | * This cluster pool will create new workers when the other ones are busy, until the max number of workers, |
10 | * when the max number of workers is reached, an event will be emitted, if you want to listen this event use the emitter method. | |
4ade5f1f | 11 | * |
325f50bc S |
12 | * @author [Christopher Quadflieg](https://github.com/Shinigami92) |
13 | * @since 2.0.0 | |
4ade5f1f | 14 | */ |
325f50bc | 15 | export class DynamicClusterPool< |
d3c8a1a8 S |
16 | Data extends JSONValue = JSONValue, |
17 | Response extends JSONValue = JSONValue | |
325f50bc | 18 | > extends FixedClusterPool<Data, Response> { |
4ade5f1f | 19 | /** |
325f50bc S |
20 | * @param min Min number of workers that will be always active |
21 | * @param max Max number of workers that will be active | |
22 | * @param filename A file path with implementation of `ClusterWorker` class, relative path is fine. | |
4ade5f1f S |
23 | * @param opts An object with possible options for example `errorHandler`, `onlineHandler`. Default: `{ maxTasks: 1000 }` |
24 | */ | |
25 | public constructor ( | |
c97c7edb | 26 | min: number, |
4ade5f1f | 27 | public readonly max: number, |
c97c7edb S |
28 | filename: string, |
29 | opts: ClusterPoolOptions = { maxTasks: 1000 } | |
4ade5f1f S |
30 | ) { |
31 | super(min, filename, opts) | |
4ade5f1f S |
32 | } |
33 | ||
c97c7edb S |
34 | protected chooseWorker (): Worker { |
35 | let worker: Worker | undefined | |
4ade5f1f S |
36 | for (const entry of this.tasks) { |
37 | if (entry[1] === 0) { | |
38 | worker = entry[0] | |
39 | break | |
40 | } | |
41 | } | |
42 | ||
43 | if (worker) { | |
44 | // a worker is free, use it | |
45 | return worker | |
46 | } else { | |
47 | if (this.workers.length === this.max) { | |
48 | this.emitter.emit('FullPool') | |
fa0f5b28 | 49 | return super.chooseWorker() |
4ade5f1f S |
50 | } |
51 | // all workers are busy create a new worker | |
c97c7edb S |
52 | const worker = this.internalNewWorker() |
53 | worker.on('message', (message: MessageValue<Data>) => { | |
4ade5f1f | 54 | if (message.kill) { |
c97c7edb S |
55 | this.sendToWorker(worker, { kill: 1 }) |
56 | void this.destroyWorker(worker) | |
f2fdaa86 | 57 | this.removeWorker(worker) |
4ade5f1f S |
58 | } |
59 | }) | |
60 | return worker | |
61 | } | |
62 | } | |
63 | } |