nowjs #TechLunch

2011/08/31(水) @ Livesense TechLunch
発表者：桂 大介

Transcript

1. katsura@livesense.co.jp
2. DEMO
3. http://rcnow.herokuapp.com/
5. before that
7. Ryan Dahl
8. node Evented Server-side Javascript
9. Why node?
10. C10K Problem http://code.google.com/p/node-js-vs-apache-php-benchmark/wiki/Tests
11. C10K Problem http://en.wikipedia.org/wiki/C10k_problem The C10k problem is a limitation that most web servers currently have, which limits the web server to being able to handle a maximum of about ten thousand simultaneous connections.
12. Servers which address the problem • Nginx • Lighttpd • Tornado@python • EventMachine@ruby • And..
13. node.js Evented Server-side Javascript Good at handling lots of different kinds of I/O at the same time. Achieves this by all making network I/O nonblocking and all file I/O asynchronous. (Almost all.)
14. node.js Node's goal is to provide an easy way to build scalable network programs.
15. hello world var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello World\n'); }).listen(1337, "127.0.0.1");
17. npm npm is a package manager for node. You can use it to install and publish your node programs. It manages dependencies and does other cool stuff.
19. express High performance, high class web development for Node.js
20. express • Robust routing • Redirection helpers • Dynamic view helpers • Application level view options • Content negotiation • Application mounting • Focus on high performance • View rendering and partials support • Environment based configuration • Session based flash notifications • Built on Connect • Executable for generating applications quickly • High test coverage
21. hello world var express = require('express'); var app = express.createServer(); app.get('/', function(req, res){ res.send('Hello World'); }); app.listen(3000);
22. hello world in Sinatra require 'sinatra' get '/' do "Hello World!" end
24. npm install now
25. on heroku
26. package.json (like Bundler) { "name": "node-example", "version": "0.0.1", "dependencies": { "now": "0.7.2" } }
27. Client-side source $(document).ready(function(){ now.receiveMessage = function(name, message){ $("#messages").append("<br>" + name + ": " + message); } $("#send-button").click(function(){ now.distributeMessage($("#text-input").val()); $("#text-input").val(""); }); now.name = prompt("What's your name?", ""); });
28. Server-side source var html = require('fs').readFileSync(__dirname+'/helloworld.html'); var server = require('http').createServer(function(req, res){ res.end(html); }); server.listen(process.env.PORT); var nowjs = require("now"); var everyone = nowjs.initialize(server); everyone.now.distributeMessage = function(message){ everyone.now.receiveMessage(this.now.name, message); };
29. Programming Language
30. 200X
31. 200X
32. 201X
34. 予告
35. null, nil, None, Nothing 0, Nullable, Mu ?
36. null に関する一考察