vunode/cluster/master.jobs/cluster.restart.js

const fs = require('fs');
const path = require('path');
const cluster = require("cluster");

module.exports = () => {

	if(Config("_server").restart) new fs._watcher(path.join(_vap.server)).watch(restart);
	
	function restart (event,pathToIt) {
		if(!pathToIt.endsWith(".js")) return; // watch JS files only!
		consol.warning(" # Application files edit occurred");
		consol.info(` - File "${pathToIt.substr(pathToIt.lastIndexOf("/")+1).substr(pathToIt.lastIndexOf("\\")+1)}" has been ${event}`);
		consol.info(" - Now Killing all workers and creating new ones");
		
		// if the program restarts when a file is changed
		// we will preserve one worker and only kill it after
		// all sibling workers have been killed
		// and new generation spawned
		let saved = 0;
		for (let id in cluster.workers) {
			if(!saved && Object.keys(cluster.workers).length > 1) {
				saved = id;
				continue;
			}
			cluster.workers[id].send("die");
		}
		cluster.on('listening', (worker, address) => {
			if(saved && Object.keys(cluster.workers).length > 1) {
				cluster.workers[saved].send("die");
				saved = 0;
			}
		});
	}
};