Nodejs Intro

Dec 28, 2010Download as KEY, PDF0 likes537 views

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. It uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, enabling its use for real-time web applications. Node.js allows JavaScript code to run on the server, facilitating the creation of fast and scalable network applications like web servers through its asynchronous and event-driven architecture.

Node.js
“Because nothing blocks, less-than-expert
programmers are able to develop fast systems.”
http://nodejs.org/#about

04/2010 Rocco Georgi, PavingWays Ltd.

Node.js
written in C and JavaScript
I/O framework
evented
non-blocking
server-side JavaScript
CommonJS module system
using V8
04/2010 Rocco Georgi, PavingWays Ltd.

written in C

./con?gure
make
make install
#> node my?le.js

04/2010 Rocco Georgi, PavingWays Ltd.

I/O

network I/O
?le I/O
* I/O

04/2010 Rocco Georgi, PavingWays Ltd.

evented
var tcp = require('tcp');

var server = tcp.createServer(function (socket) {
socket.setEncoding("utf8");
event handlers socket.addListener("connect", function () {
socket.send("hellorn");
for anything });

socket.addListener("receive", function (data) {
event loop });
socket.send(data);

no threads socket.addListener("eof", function () {
socket.send("goodbyern");
socket.close();
});
});

server.listen(7000, "localhost");

04/2010 Rocco Georgi, PavingWays Ltd.

non-blocking

I/O is never blocking anything
callbacks on anything
everything in a single thread + loop
very small memory footprint

04/2010 Rocco Georgi, PavingWays Ltd.

server-side JS
V8 engine
CommonJS: ?le = module
// this loads circle.js and the sys object
var circle = require('./circle');
var sys = require('sys');

// use the sys and circle object
sys.puts('circle area at radius 4 = ' + circle.area(4));

no window object

04/2010 Rocco Georgi, PavingWays Ltd.

Bene?ts
low memory footprint per connection
high concurrency
“hanging” requests -> Comet
custom TCP/HTTP servers
active module community
e.g. WebSockets server

04/2010 Rocco Georgi, PavingWays Ltd.

Node.js is a JavaScript runtime built on Chrome's V8 engine that allows JavaScript to be run on the server side. It is single-threaded, non-blocking, and asynchronous which means it relies on callbacks and an event loop to handle concurrent operations like I/O instead of blocking threads. The event loop handles callbacks by placing them in a queue to be executed once the current thread is complete. This allows Node.js to handle a large number of concurrent connections efficiently. Some common uses of Node.js include real-time applications, proxies, and chat applications due to its asynchronous nature. It is not well-suited for heavy computation or large web applications.

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Nodejs Intro

1. Node.js “Because nothing blocks, less-than-expert programmers are able to develop fast systems.” http://nodejs.org/#about 04/2010 Rocco Georgi, PavingWays Ltd.

2. Node.js written in C and JavaScript I/O framework evented non-blocking server-side JavaScript CommonJS module system using V8 04/2010 Rocco Georgi, PavingWays Ltd.

3. written in C ./con?gure make make install #> node my?le.js 04/2010 Rocco Georgi, PavingWays Ltd.

4. I/O network I/O ?le I/O * I/O 04/2010 Rocco Georgi, PavingWays Ltd.

5. evented var tcp = require('tcp'); var server = tcp.createServer(function (socket) { socket.setEncoding("utf8"); event handlers socket.addListener("connect", function () { socket.send("hellorn"); for anything }); socket.addListener("receive", function (data) { event loop }); socket.send(data); no threads socket.addListener("eof", function () { socket.send("goodbyern"); socket.close(); }); }); server.listen(7000, "localhost"); 04/2010 Rocco Georgi, PavingWays Ltd.

6. non-blocking I/O is never blocking anything callbacks on anything everything in a single thread + loop very small memory footprint 04/2010 Rocco Georgi, PavingWays Ltd.

7. server-side JS V8 engine CommonJS: ?le = module // this loads circle.js and the sys object var circle = require('./circle'); var sys = require('sys'); // use the sys and circle object sys.puts('circle area at radius 4 = ' + circle.area(4)); no window object 04/2010 Rocco Georgi, PavingWays Ltd.

8. Bene?ts low memory footprint per connection high concurrency “hanging” requests -> Comet custom TCP/HTTP servers active module community e.g. WebSockets server 04/2010 Rocco Georgi, PavingWays Ltd.

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Nodejs Intro

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