CODE EXAMPLE FOR JAVASCRIPT

nodejs cluster

import { BullQueue } from '@libs/lib.bullmq'
import cluster, { Worker } from 'cluster'
import os from 'os'

const clusterWorker = (fn: () => void) => {
	if (cluster.isPrimary) {
		const totalCore: number = os.cpus().length
		const totalWorker: any[] = []

		// calling worker
		for (let i = 0; i < totalCore; i++) {
			cluster.fork()
		}

		// extract worker data
		for (let j in cluster.workers) {
			totalWorker.push(j as any)
		}

		// tell me worker for kill worker is worker dead
		totalWorker.forEach(async (worker: number): Promise<void> => {
			await cluster.workers[worker].send({
				from: 'isPrimary',
				type: 'SIGKILL',
				message: 'cleanup is worker dead and change to new worker'
			})
		})

		// list status worker already running
		cluster.on('online', (worker: Worker) => {
			if (worker.isConnected()) {
				console.info(`worker: ${worker.id} is online - pid: ${worker.process.pid}`)
			}
		})

		// create new worker if worker is dead
		cluster.on('exit', (worker: Worker, _code: number, _signal: string) => {
			if (worker.isDead()) {
				console.info(`worker: ${worker.id} is dead - pid: ${worker.process.pid}`)
			}
			cluster.fork()
		})
	} else {
		if (cluster.isWorker) {
			process.send('ok captain', (err: Error) => {
				if (!err) fn()
			})
		}
	}
}

// result value
const queueProcess = async () => {
	setTimeout(() => {
		console.log("hello wordl")
	}, 2000)
}

clusterWorker(queueProcess)