Complete MVC with NodeJS
Hüseyin BABAL
Software Developer, CSM
@Sony Eurasia

Who Am I
Hüseyin BABAL
Software Developer, CSM
@Sony Eurasia
Open Source Comitter
Linux, JAVA, PHP, MongoDB, Javascript, NodeJS, Elasticsearch are my
job 
GDG event speaker

WHAT IS NODE.JS?

NodeJS is a software platform that is
used to build scalable network
applications

●
Author: Ryan Lienhart Dahl
●
Built on Chrome V8 Engine
●
Written in C++, Javascript
●
Sponsored by Joyent

SO,
WHAT IS NODE.JS?

V8 Engine
JS on Server Side
Single Thread
Event Loop
Non-Blocking I/O

WHY TO USE
NODE.JS?

I/O is Expensive

Apache:Memory
usage increases
per connection
Nginx:Constant
memory usage
per connection,
because nginx
uses event loop
mechanism

Dealing with I/O Problems
● Synchronous - One request at a time
● Fork - New process for each request
● Thread - New thread for each request

Thread per request is memory expensive!
What if all threads are busy?
Multithread code is;
● difficult to debug
● difficult to write
● in efficiently performed

How about this answer?
Single thread with non-blocking I/O

WHAT IS EVENT LOOP
AND NON-BLOCKING
I/O?

Blocking I/O
Busy
process
Block process until
job is done
Process
available
Non-Blocking I/O
Event Stack
cb
Do the job and
notify program when
it’s done

Assign jobs to event stack, you will be
notified
One single thread can handle entire
program
Traditional threaded architecture is not
an easy thing
More thread means more process,
equals more memory
Min cost, speed development
Scalable architecture
Callback functions

SEEMS COOL, HOW
ABOUT CODING?

You know JS? Then you
code
NPM (Node Package
Manager)
Available
Windows/Linux/MAC
Webstorm is the best,
also use notepad++

npm install “module_name”
Import module with “require”
File : server.js
Simple web server!!!
node server.js

To test web server, go to url http://127.0.0.1:1337
What about if you try to make a system have such url:
http://127.0.0.1:1337/product/1234.html ???

ANSWER:EXPRESS.JS

Sinatra inspired web development
framework for node.js

HOWTO START?

You have already installed node.js before…
npm install express -g
That’s it! You can use express framework on your
project

Ideal project structure for nodejs
based web applications

Model
{mongoose}
View
{jade}
Controller
{express
built-in fns}

A quick scenario…
● User goes http://127.0.0.1:1337/tickets/devfestticket54332.html
● System fetchs ticket information from db by using
id(54332)
● Assign ticket information to view
● Render view and send to user browser

MODEL DESIGNING

Ticket = new Schema({
tId:{
type:String,
required:true
},
title:{
type:String,
required:true
},
organizationDate:{
type:Date,
required:true
},
owner:{
type:String,
validate:[validator({
length:{
min:3,
max:20
}
}), "username"],
required:false,
default:"anonymous"
}
});
Yes, model definition in json format. Actually, all
the data in nodejs world are in json format.
Model definition is done. This model should be
exists under “models” folder.
Require this model when you need to use
Assume this model defined in a file called
“Ticket.js”

CONTROLLER

*Controller isthe behaviour of your program
*Put your controller definition files under “controller” folder.

VIEW

View files are under “views” folder.
You can use template engines with express.js, in this scenario, “jade” used
Create ticket-detail.jade, put it under “views” folder

Indendation based template engine

COMBINE ALL

Controllers,
Views, Models
managed by main
bootstrap file
called “app.js”
1
2
Go to project
folder and say
3
node app.js
4
5

BEST PRACTICES

WHO USES NODEJS?

Node.js
https://github.com/joyent/node
express.js
https://github.com/visionmedia/express
mongoose
https://github.com/LearnBoost/mongoose
jade
https://github.com/visionmedia/jade
Express Simple Blog
https://github.com/nodejstr/expressSimpleBlog
NodeJS Türkiye
http://www.nodejstr.com/

Questions?

Thank you 