Node.js

Jun 19, 20115 likes3,795 views

Node.js is an asynchronous and event-driven JavaScript runtime built on Google's V8 engine. It allows building scalable network applications easily and uses an event loop model with a single thread to handle non-blocking I/O. Asynchronous I/O is used to avoid blocking operations and keep the single thread available. Node.js has a large module ecosystem and is commonly used for real-time web applications and scalable backend services.

j@n-dillmann.de

25. Mai 2011

Design and Construction of Distributed Enterprise Applications
TU Darmstadt, SS 2011

What?

”Node's goal is to provide an easy way
to build scalable network programs.“
—nodejs.org

2

How?

Keeping slow
operations from
blocking other
operations.

3

Traditional I/O

var results = db.query("SELECT * FROM TABLE");

// zzzzZZZzzzzz

for (var i=0; i<results.length; i++) {

// process query result

}

// do something else

4

Asynchronous I/O

db.query("SELECT * FROM TABLE", function(results) {

for (var i=0; i<results.length; i++) {

// process query result

}

});

// do something else immediately

5

And how many threads?

ONLY ONE THREAD?!
threading ain't free
easy to code
no deadlocks
no race-conditions

6

var http = require('http');
e. js
ttpsqlit
var sqlite3 = require('sqlite3'); $ node h

var db = new sqlite3.Database('sample.db');

http.createServer(function(request, response) {

response.writeHead(200, {"Content-Type": "text/plain"});

db.all("SELECT * FROM names", function (err, rows) {

rows.forEach(function(row) {

response.write(row.name + ' ' + row.surname + ' (' + row.email + ')n');

});

response.end();

});

}).listen(8000);

console.log("Running at http://127.0.0.1:8000/");

7

But how does it work?
client node http sqlite db
create server

console.log listen on 8000

request

SELECT * FROM ...

execute query

get rows

write response

response

8

In other words:

”With an event
loop, you ask it to
do something and
it'll get back to you
when it's done.“
—@davidpadbury

9

So … what is in there?
com
piles
Java
ide Scri
rS t pt t
rve rip Ass o
Se Sc embl
er
J ava
GOOGLE V8
ted
op even
Lo I/O
Ev ent file
LIBEV LIBEIO
… and more

10

node.js 101
Server Side JavaScript
Built on Googles V8
Evented, non-blocking I/O
Single threaded
Everything is asynchronous
Modules for (nearly) everything
Currently only for unix-based systems available *

* on Windows, you can try cygwin, but that is like asking for trouble... 11

Where to go next?

http://nodejs.org
http://howtonode.org
http://chaosradio.ccc.de/cre167.html
http://groups.google.com/group/nodejs
http://github.com/joyent/node/wiki/modules

12

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Node.js

1. [email protected] 25. Mai 2011 Design and Construction of Distributed Enterprise Applications TU Darmstadt, SS 2011

2. What? ”Node's goal is to provide an easy way to build scalable network programs.“ —nodejs.org 2

3. How? Keeping slow operations from blocking other operations. 3

4. Traditional I/O var results = db.query("SELECT * FROM TABLE"); // zzzzZZZzzzzz for (var i=0; i<results.length; i++) { // process query result } // do something else 4

5. Asynchronous I/O db.query("SELECT * FROM TABLE", function(results) { for (var i=0; i<results.length; i++) { // process query result } }); // do something else immediately 5

6. And how many threads? ONLY ONE THREAD?! threading ain't free easy to code no deadlocks no race-conditions 6

7. var http = require('http'); e. js ttpsqlit var sqlite3 = require('sqlite3'); $ node h var db = new sqlite3.Database('sample.db'); http.createServer(function(request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); db.all("SELECT * FROM names", function (err, rows) { rows.forEach(function(row) { response.write(row.name + ' ' + row.surname + ' (' + row.email + ')n'); }); response.end(); }); }).listen(8000); console.log("Running at http://127.0.0.1:8000/"); 7

8. But how does it work? client node http sqlite db create server console.log listen on 8000 request SELECT * FROM ... execute query get rows write response response 8

9. In other words: ”With an event loop, you ask it to do something and it'll get back to you when it's done.“ —@davidpadbury 9

10. So … what is in there? com piles Java ide Scri rS t pt t rve rip Ass o Se Sc embl er J ava GOOGLE V8 ted op even Lo I/O Ev ent file LIBEV LIBEIO … and more 10

11. node.js 101 Server Side JavaScript Built on Googles V8 Evented, non-blocking I/O Single threaded Everything is asynchronous Modules for (nearly) everything Currently only for unix-based systems available * * on Windows, you can try cygwin, but that is like asking for trouble... 11

12. Where to go next? http://nodejs.org http://howtonode.org http://chaosradio.ccc.de/cre167.html http://groups.google.com/group/nodejs http://github.com/joyent/node/wiki/modules 12

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