-import type { MessagePort } from 'worker_threads'
-import { isMainThread, parentPort } from 'worker_threads'
-import type { JSONValue, MessageValue } from '../utility-types'
+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`.
* If you use a `DynamicThreadPool` the extra workers that were created will be terminated,
* but the minimum number of workers will be guaranteed.
*
- * @template Data Type of data this worker receives from pool's execution.
- * @template Response Type of response the worker sends back to the main thread.
- *
+ * @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 extends JSONValue = JSONValue,
- Response extends JSONValue = JSONValue
+ 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 fn Function processed by the worker when the pool's `execution` function is invoked.
- * @param opts Options for the 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 (fn: (data: Data) => Response, opts: WorkerOptions = {}) {
- super('worker-thread-pool:pioardi', isMainThread, fn, parentPort, opts)
+ 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,
+ taskFunctionNames: this.listTaskFunctionNames()
+ })
+ } catch {
+ this.sendToMainWorker({
+ ready: false,
+ taskFunctionNames: this.listTaskFunctionNames()
+ })
+ }
+ }
+ }
+
+ /** @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.getMainWorker().postMessage(message)
+ this.port.postMessage({ ...message, workerId: this.id })
+ }
+
+ /** @inheritDoc */
+ protected handleError (error: Error | string): string {
+ return error as string
}
}