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325f50bc | 1 | import { fork, isMaster, setupMaster, Worker } from 'cluster' |
d3c8a1a8 | 2 | import type { JSONValue, MessageValue } from '../../utility-types' |
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3 | import type { PoolOptions } from '../abstract-pool' |
4 | import { AbstractPool } from '../abstract-pool' | |
4ade5f1f | 5 | |
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6 | /** |
7 | * Options for a poolifier cluster pool. | |
8 | */ | |
c97c7edb | 9 | export interface ClusterPoolOptions extends PoolOptions<Worker> { |
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10 | /** |
11 | * Key/value pairs to add to worker process environment. | |
12 | * | |
13 | * @see https://nodejs.org/api/cluster.html#cluster_cluster_fork_env | |
14 | */ | |
15 | // eslint-disable-next-line @typescript-eslint/no-explicit-any | |
16 | env?: any | |
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17 | } |
18 | ||
19 | /** | |
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20 | * A cluster pool with a fixed number of workers. |
21 | * | |
22 | * It is possible to perform tasks in sync or asynchronous mode as you prefer. | |
4ade5f1f | 23 | * |
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24 | * This pool selects the workers in a round robin fashion. |
25 | * | |
26 | * @template Data Type of data sent to the worker. | |
27 | * @template Response Type of response of execution. | |
4ade5f1f | 28 | * |
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29 | * @author [Christopher Quadflieg](https://github.com/Shinigami92) |
30 | * @since 2.0.0 | |
4ade5f1f | 31 | */ |
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32 | export class FixedClusterPool< |
33 | Data extends JSONValue = JSONValue, | |
34 | Response extends JSONValue = JSONValue | |
35 | > extends AbstractPool<Worker, Data, Response> { | |
4ade5f1f | 36 | /** |
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37 | * Constructs a new poolifier fixed cluster pool. |
38 | * | |
5c5a1fb7 | 39 | * @param numberOfWorkers Number of workers for this pool. |
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40 | * @param filePath Path to an implementation of a `ClusterWorker` file, which can be relative or absolute. |
41 | * @param opts Options for this fixed cluster pool. Default: `{ maxTasks: 1000 }` | |
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42 | */ |
43 | public constructor ( | |
5c5a1fb7 | 44 | numberOfWorkers: number, |
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45 | filePath: string, |
46 | public readonly opts: ClusterPoolOptions = { maxTasks: 1000 } | |
4ade5f1f | 47 | ) { |
5c5a1fb7 | 48 | super(numberOfWorkers, filePath, opts) |
c97c7edb | 49 | } |
4ade5f1f | 50 | |
c97c7edb | 51 | protected setupHook (): void { |
325f50bc S |
52 | setupMaster({ |
53 | exec: this.filePath | |
54 | }) | |
c97c7edb | 55 | } |
325f50bc | 56 | |
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57 | protected isMain (): boolean { |
58 | return isMaster | |
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59 | } |
60 | ||
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61 | protected destroyWorker (worker: Worker): void { |
62 | worker.kill() | |
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63 | } |
64 | ||
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65 | protected sendToWorker (worker: Worker, message: MessageValue<Data>): void { |
66 | worker.send(message) | |
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67 | } |
68 | ||
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69 | protected registerWorkerMessageListener<Message extends Data | Response> ( |
70 | worker: Worker, | |
71 | listener: (message: MessageValue<Message>) => void | |
c97c7edb | 72 | ): void { |
4f7fa42a | 73 | worker.on('message', listener) |
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74 | } |
75 | ||
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76 | protected unregisterWorkerMessageListener<Message extends Data | Response> ( |
77 | worker: Worker, | |
78 | listener: (message: MessageValue<Message>) => void | |
c97c7edb | 79 | ): void { |
4f7fa42a | 80 | worker.removeListener('message', listener) |
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81 | } |
82 | ||
280c2a77 | 83 | protected createWorker (): Worker { |
c97c7edb | 84 | return fork(this.opts.env) |
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85 | } |
86 | ||
280c2a77 | 87 | protected afterWorkerSetup (worker: Worker): void { |
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88 | // we will attach a listener for every task, |
89 | // when task is completed the listener will be removed but to avoid warnings we are increasing the max listeners size | |
325f50bc | 90 | worker.setMaxListeners(this.opts.maxTasks ?? 1000) |
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91 | } |
92 | } |