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thread-worker.ts
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thread-worker.ts
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import {
type MessagePort,
isMainThread,
parentPort,
threadId
} from 'node:worker_threads'
import type { MessageValue } from '../utility-types'
import { AbstractWorker } from './abstract-worker'
import type { WorkerOptions } from './worker-options'
import type { TaskFunction, TaskFunctions } from './task-functions'
/**
* A thread worker used by a poolifier `ThreadPool`.
*
* When this worker is inactive for more than the given `maxInactiveTime`,
* it will send a termination request to its main thread.
*
* If you use a `DynamicThreadPool` the extra workers that were created will be terminated,
* but the minimum number of workers will be guaranteed.
*
* @typeParam Data - Type of data this worker receives from pool's execution. This can only be structured-cloneable data.
* @typeParam Response - Type of response the worker sends back to the main thread. This can only be structured-cloneable data.
* @author [Alessandro Pio Ardizio](https://github.com/pioardi)
* @since 0.0.1
*/
export class ThreadWorker<
Data = unknown,
Response = unknown
> extends AbstractWorker<MessagePort, Data, Response> {
/**
* Message port used to communicate with the main worker.
*/
private port!: MessagePort
/**
* Constructs a new poolifier thread worker.
*
* @param taskFunctions - Task function(s) processed by the worker when the pool's `execution` function is invoked.
* @param opts - Options for the worker.
*/
public constructor (
taskFunctions: TaskFunction<Data, Response> | TaskFunctions<Data, Response>,
opts: WorkerOptions = {}
) {
super(
'worker-thread-pool:poolifier',
isMainThread,
parentPort as MessagePort,
taskFunctions,
opts
)
}
/** @inheritDoc */
protected handleReadyMessage (message: MessageValue<Data>): void {
if (
message.workerId === this.id &&
message.ready === false &&
message.port != null
) {
try {
this.port = message.port
this.port.on('message', this.messageListener.bind(this))
this.sendToMainWorker({
ready: true,
taskFunctions: this.listTaskFunctions(),
workerId: this.id
})
} catch {
this.sendToMainWorker({
ready: false,
taskFunctions: this.listTaskFunctions(),
workerId: this.id
})
}
}
}
/** @inheritDoc */
protected handleKillMessage (message: MessageValue<Data>): void {
super.handleKillMessage(message)
this.port?.unref()
this.port?.close()
}
/** @inheritDoc */
protected get id (): number {
return threadId
}
/** @inheritDoc */
protected sendToMainWorker (message: MessageValue<Response>): void {
this.port.postMessage(message)
}
/** @inheritDoc */
protected handleError (e: Error | string): string {
return e as string
}
}