-import { AsyncResource } from 'async_hooks'
-import type { Worker } from 'cluster'
-import type { MessagePort } from 'worker_threads'
+import { AsyncResource } from 'node:async_hooks'
+import type { Worker } from 'node:cluster'
+import type { MessagePort } from 'node:worker_threads'
import type { MessageValue } from '../utility-types'
import { EMPTY_FUNCTION } from '../utils'
import type { KillBehavior, WorkerOptions } from './worker-options'
/**
* Base class that implements some shared logic for all poolifier workers.
*
- * @template MainWorker Type of main worker.
- * @template Data Type of data this worker receives from pool's execution. This can only be serializable data.
- * @template Response Type of response the worker sends back to the main worker. This can only be serializable data.
+ * @typeParam MainWorker - Type of main worker.
+ * @typeParam Data - Type of data this worker receives from pool's execution. This can only be serializable data.
+ * @typeParam Response - Type of response the worker sends back to the main worker. This can only be serializable data.
*/
export abstract class AbstractWorker<
MainWorker extends Worker | MessagePort,
/**
* Timestamp of the last task processed by this worker.
*/
- protected lastTaskTimestamp: number
+ protected lastTaskTimestamp!: number
/**
- * Handler Id of the `aliveInterval` worker alive check.
+ * Handler id of the `aliveInterval` worker alive check.
*/
protected readonly aliveInterval?: NodeJS.Timeout
- /**
- * Options for the worker.
- */
- public readonly opts: WorkerOptions
/**
* Constructs a new poolifier worker.
*
- * @param type The type of async event.
- * @param isMain Whether this is the main worker or not.
- * @param fn Function processed by the worker when the pool's `execution` function is invoked.
- * @param mainWorker Reference to main worker.
- * @param opts Options for the worker.
+ * @param type - The type of async event.
+ * @param isMain - Whether this is the main worker or not.
+ * @param fn - Function processed by the worker when the pool's `execution` function is invoked.
+ * @param mainWorker - Reference to main worker.
+ * @param opts - Options for the worker.
*/
public constructor (
type: string,
- isMain: boolean,
+ protected readonly isMain: boolean,
fn: (data: Data) => Response,
protected mainWorker: MainWorker | undefined | null,
- opts: WorkerOptions = {
+ protected readonly opts: WorkerOptions = {
/**
- * The kill behavior option on this Worker or its default value.
+ * The kill behavior option on this worker or its default value.
*/
killBehavior: DEFAULT_KILL_BEHAVIOR,
/**
}
) {
super(type)
- this.opts = opts
this.checkFunctionInput(fn)
this.checkWorkerOptions(this.opts)
- this.lastTaskTimestamp = Date.now()
- // Keep the worker active
- if (!isMain) {
+ if (!this.isMain) {
+ this.lastTaskTimestamp = Date.now()
this.aliveInterval = setInterval(
this.checkAlive.bind(this),
(this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) / 2
this.checkAlive.bind(this)()
}
- this.mainWorker?.on('message', (value: MessageValue<Data, MainWorker>) => {
- this.messageListener(value, fn)
- })
+ this.mainWorker?.on(
+ 'message',
+ (message: MessageValue<Data, MainWorker>) => {
+ this.messageListener(message, fn)
+ }
+ )
}
+ /**
+ * Worker message listener.
+ *
+ * @param message - Message received.
+ * @param fn - Function processed by the worker when the pool's `execution` function is invoked.
+ */
protected messageListener (
- value: MessageValue<Data, MainWorker>,
+ message: MessageValue<Data, MainWorker>,
fn: (data: Data) => Response
): void {
- if (value.data !== undefined && value.id !== undefined) {
- // Here you will receive messages
+ if (message.data != null && message.id != null) {
+ // Task message received
if (this.opts.async === true) {
- this.runInAsyncScope(this.runAsync.bind(this), this, fn, value)
+ this.runInAsyncScope(this.runAsync.bind(this), this, fn, message)
} else {
- this.runInAsyncScope(this.run.bind(this), this, fn, value)
+ this.runInAsyncScope(this.run.bind(this), this, fn, message)
}
- } else if (value.parent !== undefined) {
- // Save a reference of the main worker to communicate with it
- // This will be received once
- this.mainWorker = value.parent
- } else if (value.kill !== undefined) {
- // Here is time to kill this worker, just clearing the interval
- if (this.aliveInterval != null) clearInterval(this.aliveInterval)
+ } else if (message.parent != null) {
+ // Main worker reference message received
+ this.mainWorker = message.parent
+ } else if (message.kill != null) {
+ // Kill message received
+ this.aliveInterval != null && clearInterval(this.aliveInterval)
this.emitDestroy()
}
}
/**
* Checks if the `fn` parameter is passed to the constructor.
*
- * @param fn The function that should be defined.
+ * @param fn - The function that should be defined.
*/
private checkFunctionInput (fn: (data: Data) => Response): void {
if (fn == null) throw new Error('fn parameter is mandatory')
- if (typeof fn !== 'function') { throw new TypeError('fn parameter is not a function') }
+ if (typeof fn !== 'function') {
+ throw new TypeError('fn parameter is not a function')
+ }
}
/**
/**
* Sends a message to the main worker.
*
- * @param message The response message.
+ * @param message - The response message.
*/
protected abstract sendToMainWorker (message: MessageValue<Response>): void
/**
* Handles an error and convert it to a string so it can be sent back to the main worker.
*
- * @param e The error raised by the worker.
+ * @param e - The error raised by the worker.
* @returns Message of the error.
*/
protected handleError (e: Error | string): string {
/**
* Runs the given function synchronously.
*
- * @param fn Function that will be executed.
- * @param value Input data for the given function.
+ * @param fn - Function that will be executed.
+ * @param message - Input data for the given function.
*/
protected run (
fn: (data?: Data) => Response,
- value: MessageValue<Data>
+ message: MessageValue<Data>
): void {
try {
- const startTaskTimestamp = Date.now()
- const res = fn(value.data)
- const taskRunTime = Date.now() - startTaskTimestamp
- this.sendToMainWorker({ data: res, id: value.id, taskRunTime })
+ const startTimestamp = Date.now()
+ const res = fn(message.data)
+ const runTime = Date.now() - startTimestamp
+ this.sendToMainWorker({ data: res, id: message.id, runTime })
} catch (e) {
const err = this.handleError(e as Error)
- this.sendToMainWorker({ error: err, id: value.id })
+ this.sendToMainWorker({ error: err, id: message.id })
} finally {
- this.lastTaskTimestamp = Date.now()
+ !this.isMain && (this.lastTaskTimestamp = Date.now())
}
}
/**
* Runs the given function asynchronously.
*
- * @param fn Function that will be executed.
- * @param value Input data for the given function.
+ * @param fn - Function that will be executed.
+ * @param message - Input data for the given function.
*/
protected runAsync (
fn: (data?: Data) => Promise<Response>,
- value: MessageValue<Data>
+ message: MessageValue<Data>
): void {
- const startTaskTimestamp = Date.now()
- fn(value.data)
+ const startTimestamp = Date.now()
+ fn(message.data)
.then(res => {
- const taskRunTime = Date.now() - startTaskTimestamp
- this.sendToMainWorker({ data: res, id: value.id, taskRunTime })
+ const runTime = Date.now() - startTimestamp
+ this.sendToMainWorker({ data: res, id: message.id, runTime })
return null
})
.catch(e => {
const err = this.handleError(e as Error)
- this.sendToMainWorker({ error: err, id: value.id })
+ this.sendToMainWorker({ error: err, id: message.id })
})
.finally(() => {
- this.lastTaskTimestamp = Date.now()
+ !this.isMain && (this.lastTaskTimestamp = Date.now())
})
.catch(EMPTY_FUNCTION)
}
repositories / poolifier.git / blobdiff