refactor: sensible defaults for worker choice strategy policy
[poolifier.git] / src / worker / thread-worker.ts
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1import {
2 type MessagePort,
3 isMainThread,
4 parentPort,
5 threadId
6} from 'node:worker_threads'
b6b32453 7import type { MessageValue } from '../utility-types'
c97c7edb 8import { AbstractWorker } from './abstract-worker'
325f50bc 9import type { WorkerOptions } from './worker-options'
82ea6492 10import type { TaskFunction, TaskFunctions } from './task-functions'
a32e02ba 11
a32e02ba 12/**
729c563d 13 * A thread worker used by a poolifier `ThreadPool`.
4ade5f1f 14 *
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15 * When this worker is inactive for more than the given `maxInactiveTime`,
16 * it will send a termination request to its main thread.
17 *
18 * If you use a `DynamicThreadPool` the extra workers that were created will be terminated,
19 * but the minimum number of workers will be guaranteed.
20 *
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21 * @typeParam Data - Type of data this worker receives from pool's execution. This can only be structured-cloneable data.
22 * @typeParam Response - Type of response the worker sends back to the main thread. This can only be structured-cloneable data.
4ade5f1f 23 * @author [Alessandro Pio Ardizio](https://github.com/pioardi)
a32e02ba 24 * @since 0.0.1
25 */
d3c8a1a8 26export class ThreadWorker<
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27 Data = unknown,
28 Response = unknown
d3c8a1a8 29> extends AbstractWorker<MessagePort, Data, Response> {
85aeb3f3 30 /**
2761efb4 31 * Message port used to communicate with the main worker.
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32 */
33 private port!: MessagePort
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34 /**
35 * Constructs a new poolifier thread worker.
36 *
82888165 37 * @param taskFunctions - Task function(s) processed by the worker when the pool's `execution` function is invoked.
38e795c1 38 * @param opts - Options for the worker.
729c563d 39 */
d4aeae5a 40 public constructor (
82ea6492 41 taskFunctions: TaskFunction<Data, Response> | TaskFunctions<Data, Response>,
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42 opts: WorkerOptions = {}
43 ) {
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44 super(
45 'worker-thread-pool:poolifier',
46 isMainThread,
e102732c 47 parentPort as MessagePort,
85aeb3f3 48 taskFunctions,
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49 opts
50 )
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51 }
52
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53 /** @inheritDoc */
54 protected handleReadyMessage (message: MessageValue<Data>): void {
55 if (
56 message.workerId === this.id &&
f05ed93c 57 message.ready === false &&
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58 message.port != null
59 ) {
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60 try {
61 this.port = message.port
62 this.port.on('message', this.messageListener.bind(this))
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63 this.sendToMainWorker({
64 ready: true,
65 taskFunctions: this.listTaskFunctions(),
66 workerId: this.id
67 })
f05ed93c 68 } catch {
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69 this.sendToMainWorker({
70 ready: false,
71 taskFunctions: this.listTaskFunctions(),
72 workerId: this.id
73 })
f05ed93c 74 }
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75 }
76 }
77
984dc9c8 78 /** @inheritDoc */
d655027b 79 protected handleKillMessage (message: MessageValue<Data>): void {
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80 super.handleKillMessage(message)
81 this.port?.unref()
82 this.port?.close()
83 }
84
85aeb3f3 85 /** @inheritDoc */
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86 protected get id (): number {
87 return threadId
106744f7 88 }
7784f548 89
afc003b2 90 /** @inheritDoc */
c97c7edb 91 protected sendToMainWorker (message: MessageValue<Response>): void {
85aeb3f3 92 this.port.postMessage(message)
7784f548 93 }
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94
95 /** @inheritDoc */
96 protected handleError (e: Error | string): string {
97 return e as string
98 }
a32e02ba 99}