demos/Demo/Day3/Scaling/6-cluster.js

var cluster=require('cluster');
var http=require('http');
var numWorkers=2;
//console.log(process.env.PORT);
if(cluster.isMaster){
for(var i=0;i<numWorkers;i++){
console.log("Master: about to fork a worker");
cluster.fork();
}

cluster.on('fork',function(worker){
console.log("Master: fork event(worker "+worker.id +")");
});

cluster.on('online',function(worker){
console.log("Master: online event(worker "+worker.id +")");
});

cluster.on('listening',function(worker,address){
console.log("Master: listening event(worker "+worker.id +", pid " +worker.process.pid+", "
			+address.address+":"+address.port+")");
});

cluster.on('exit',function(worker,code,signal){
console.log("Master: exit event(worker "+worker.id +")");
});
}else
{
console.log('Worker : worker #'+cluster.worker.id+' ready!');
var count=0;
http.createServer(function(req,res){
if(req.url==="/favicon.ico")
		{
			res.writeHead(200,{"Content-Type":"image/x-icon"});
			res.end();
			return;
		}
res.writeHead(200);
count++;
console.log("Worker #"+cluster.worker.id+" is incrementing count to "+count);
res.end("hello world from worker #"+cluster.worker.id+"(pid "+cluster.worker.process.pid+
		") with count="+count+"\n");
if(count===3){
cluster.worker.destroy();
}
}).listen(3000);
}