node

Transcript

1. Node.js
2. Evented I/O for V8 JavaScript
3. DAFUQ?
4. Jan 2009
5. Ryan Dahl
15. De facto language of the web Event-driven culture JavaScript
16. Chrome's JavaScript runtime Blazing FAST!!! V8 JavaScript Engine
17. Event-driven Non-blocking Asynchronous I/O Model
18. ಠ_ಠ
19. result = readFile('foo') foobar = result Let's do some I/O
21. Register Cache Memory Harddisk Relative latency 1 10 100 10000000
22. result = readFile('foo') 100000 foobar = result 1 Relative latency
23. go fetch some file do nothing and wait ... wait ... wait ... got the file! assign it to foobar Meanwhile result = readFile('foo') foobar = result
24. result = readUserInput() ∞ foobar = result 1 How about this
26. Input blocks! A Fact
27. Introducing … Non-blocking I/O Now what?
28. readFile('foo', function (result) { foobar = result; }); Non-blocking I/O
29. go fetch some file wait ... wait ... wait ... got the file! assign it to foobar Meanwhile readFile('foo', function (result) { foobar = result })
31. go fetch some file 'Hello!!' wait ... wait ... got the file! assign it to foobar Difference readFile('foo', function (result) { foobar = result }) Print('hello!!')
33. “Tell me when you're done, I have something else to do” Event loop Evented I/O Non-blocking I/O
34. Another Solution?
35. Nginx v.s. Apache
36. Nginx v.s. Apache
38. More power, More responsibility Synchronizations, deadlocks, … Concurrency is fundamentally hard Threads
39. From 1 to 10000 or even more Ability to scale Evented I/O scales well! Scalability
40. Node.js runs in a single process How to take advantage of multi-core? Simple, run more Node instance! Single Threaded
41. http://nodejs.org Hosted on Github Powered by Community Node.js
42. Unix ./configure make make install Windows click next, next, and next Install
43. hello.js console.log('Hello world!'); and do this node hello.js Hello World
44. var http = require('http'); http.Server(function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello World\n'); }).listen(3000); HTTP server
45. var net = require('net'); var server = net.Server(function (socket) { socket.write('Echo server\r\n'); socket.pipe(socket); }).listen(1337); TCP server
46. Modularize everything! Built-in Third-party Homemade :D Modules
47. Node Package Manager Perl's CPAN Ruby's Gem NPM
48. Over 9000 packages Dead easy to use NPM
49. npm install express NPM
50. http://no.de Joyent http://heroku.com Heroku http://nodester.com Nodester … Hosting