import { AsyncResource } from 'node:async_hooks'
import type { Worker } from 'node:cluster'
import type { MessagePort } from 'node:worker_threads'
-import type {
- MessageValue,
- WorkerAsyncFunction,
- WorkerFunction,
- WorkerSyncFunction
+import {
+ type MessageValue,
+ type TaskFunctions,
+ type WorkerAsyncFunction,
+ type WorkerFunction,
+ type WorkerSyncFunction
} from '../utility-types'
import { EMPTY_FUNCTION } from '../utils'
import type { KillBehavior, WorkerOptions } from './worker-options'
import { KillBehaviors } from './worker-options'
+const DEFAULT_FUNCTION_NAME = 'default'
const DEFAULT_MAX_INACTIVE_TIME = 60000
const DEFAULT_KILL_BEHAVIOR: KillBehavior = KillBehaviors.SOFT
Data = unknown,
Response = unknown
> extends AsyncResource {
+ /**
+ * Task function(s) processed by the worker when the pool's `execution` function is invoked.
+ */
+ protected taskFunctions!: Map<string, WorkerFunction<Data, Response>>
/**
* Timestamp of the last task processed by this 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 taskFunctions - Task function(s) processed by the worker when the pool's `execution` function is invoked. The first function is the default function.
* @param mainWorker - Reference to main worker.
* @param opts - Options for the worker.
*/
public constructor (
type: string,
protected readonly isMain: boolean,
- fn: WorkerFunction<Data, Response>,
+ taskFunctions:
+ | WorkerFunction<Data, Response>
+ | TaskFunctions<Data, Response>,
protected mainWorker: MainWorker | undefined | null,
protected readonly opts: WorkerOptions = {
/**
) {
super(type)
this.checkWorkerOptions(this.opts)
- this.checkFunctionInput(fn)
+ this.checkTaskFunctions(taskFunctions)
if (!this.isMain) {
this.lastTaskTimestamp = performance.now()
this.aliveInterval = setInterval(
this.checkAlive.bind(this)()
}
- this.mainWorker?.on(
- 'message',
- (message: MessageValue<Data, MainWorker>) => {
- this.messageListener(message, fn)
+ this.mainWorker?.on('message', this.messageListener.bind(this))
+ }
+
+ private checkWorkerOptions (opts: WorkerOptions): void {
+ this.opts.killBehavior = opts.killBehavior ?? DEFAULT_KILL_BEHAVIOR
+ this.opts.maxInactiveTime =
+ opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME
+ this.opts.async = opts.async ?? false
+ }
+
+ /**
+ * Checks if the `taskFunctions` parameter is passed to the constructor.
+ *
+ * @param taskFunctions - The task function(s) parameter that should be checked.
+ */
+ private checkTaskFunctions (
+ taskFunctions:
+ | WorkerFunction<Data, Response>
+ | TaskFunctions<Data, Response>
+ ): void {
+ if (taskFunctions == null) {
+ throw new Error('taskFunctions parameter is mandatory')
+ }
+ if (
+ typeof taskFunctions !== 'function' &&
+ typeof taskFunctions !== 'object'
+ ) {
+ throw new Error('taskFunctions parameter is not a function or an object')
+ }
+ if (
+ typeof taskFunctions === 'object' &&
+ taskFunctions.constructor !== Object &&
+ Object.prototype.toString.call(taskFunctions) !== '[object Object]'
+ ) {
+ throw new Error('taskFunctions parameter is not an object literal')
+ }
+ this.taskFunctions = new Map<string, WorkerFunction<Data, Response>>()
+ if (typeof taskFunctions !== 'function') {
+ let firstEntry = true
+ for (const [name, fn] of Object.entries(taskFunctions)) {
+ if (typeof fn !== 'function') {
+ throw new Error(
+ 'A taskFunctions parameter object value is not a function'
+ )
+ }
+ this.taskFunctions.set(name, fn.bind(this))
+ if (firstEntry) {
+ this.taskFunctions.set(DEFAULT_FUNCTION_NAME, fn.bind(this))
+ firstEntry = false
+ }
}
- )
+ } else {
+ this.taskFunctions.set(DEFAULT_FUNCTION_NAME, taskFunctions.bind(this))
+ }
}
/**
* Worker message listener.
*
* @param message - Message received.
- * @param fn - Function processed by the worker when the pool's `execution` function is invoked.
*/
- protected messageListener (
- message: MessageValue<Data, MainWorker>,
- fn: WorkerFunction<Data, Response>
- ): void {
+ protected messageListener (message: MessageValue<Data, MainWorker>): void {
if (message.id != null && message.data != null) {
// Task message received
- if (this.opts.async === true) {
+ const fn = this.getTaskFunction(message.name)
+ if (fn?.constructor.name === 'AsyncFunction') {
this.runInAsyncScope(this.runAsync.bind(this), this, fn, message)
} else {
- this.runInAsyncScope(this.run.bind(this), this, fn, message)
+ this.runInAsyncScope(this.runSync.bind(this), this, fn, message)
}
} else if (message.parent != null) {
// Main worker reference message received
}
}
- private checkWorkerOptions (opts: WorkerOptions): void {
- this.opts.killBehavior = opts.killBehavior ?? DEFAULT_KILL_BEHAVIOR
- this.opts.maxInactiveTime =
- opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME
- this.opts.async = opts.async ?? false
- }
-
- /**
- * Checks if the `fn` parameter is passed to the constructor.
- *
- * @param fn - The function that should be defined.
- */
- private checkFunctionInput (fn: WorkerFunction<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 (fn.constructor.name === 'AsyncFunction' && this.opts.async === false) {
- throw new Error(
- 'fn parameter is an async function, please set the async option to true'
- )
- }
- }
-
/**
* Returns the main worker.
*
* @param fn - Function that will be executed.
* @param message - Input data for the given function.
*/
- protected run (
+ protected runSync (
fn: WorkerSyncFunction<Data, Response>,
message: MessageValue<Data>
): void {
})
.catch(EMPTY_FUNCTION)
}
+
+ /**
+ * Gets the task function in the given scope.
+ *
+ * @param name - Name of the function that will be returned.
+ */
+ private getTaskFunction (name?: string): WorkerFunction<Data, Response> {
+ name = name ?? DEFAULT_FUNCTION_NAME
+ const fn = this.taskFunctions.get(name)
+ if (fn == null) {
+ throw new Error(`Task function "${name}" not found`)
+ }
+ return fn
+ }
}
repositories / poolifier.git / blobdiff