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T4T Training day - NodeJS
- 2. Content • About me • Common Js • Node Js • Demo(s) ! • Grunt Js • Demo !
- 4. About me Tim Sommer (@sommertim) >3 years @ T4T Passion for Front-End Development http://blog.timsommer.be https://github.com/timsommer
- 5. Learning JavaScript used to mean you weren't a serious software developer. Today, not learning Javascript means the same thing. - Tim O'Reilly
- 8. Server side JavaScript? • Has been around for a long time • Very fragmented: • Netscape started server-side scripting (SSJS), December, 1994 • Mozilla Spidermonkey, C, Firefox > 3.5, GNOME (started at Netscape), first engine ever, 1996 • Mozilla Rhino, Java, 1997 (started by Netscape for navigator) • Google V8, Chrome, September 2, 2008. • SquirrelFish (AKA JavaScriptCore), Webkit, June 2, 2008
- 9. Server side problems? • No compatible standard library. • No standard interface to connect to a database. • No standard method to insert different modules. • No method for packaging code for distribution and installation. • Module storage of a common package that solves dependency is necessary.
- 10. Commonjs ? • Kevin Dangoor, January 2009 • Spec • JavaScript ecosystem for web servers, desktop and command line apps and in the browser. • CommonJS-compliant systems: • Server-side JavaScript applications • Command line tools • Desktop GUI-based applications • Hybrid applications (Titanium, Adobe AIR)
- 11. Why Server Side js? • Familiar and universal • Same language on server and client (code sharing) • Notions from Self, Scheme, and Prototype - all with a C/C++/Java-like syntax. • Server side JavaScript has the potential to significantly outperform other common dynamic languages.
- 12. Why Server Side js?
- 13. Common Spec? • Modules • Binary strings and buffers • Charset encodings • Binary, buffered, and textual input and output (io) streams • System process arguments, environment, and streams • File system interface • Socket streams • Unit test assertions, running, and reporting • Web server gateway interface, JSGI • Local and remote packages and package management
- 14. Common Spec?
- 15. Common Spec?
- 16. AMD? • Asynchronous module definition • Started as offspin (fork) of CommonJs • Failed to reach an agreement in discussions with CommonJS about using JavaScript module in an asynchronous situation. • Evolved in own module definition API • The difference in the module specifications defined by the two territories are in module load.
- 17. Implementations • ArangoDB (V8): NoSQL • CouchDB (SpiderMonkey): NoSQL • AkShell (V8): browser based IDE • Narwhal (V8, Rhino): JavaScript platform • Requirejs (Web Browser): module loader • Curljs (Web browser): resource loader • Whenjs (Web browser): async promises library • … • Nodejs (V8)
- 19. Nodejs?
- 20. Nodejs? • Event-driven • Flow is determined by events • Event loop • Non-blocking I/O (AKA asynchronous I/O) • I/O processing while permitting other processing to continue • Parallel I/O • You can do other things while waiting. • You can wait on more than one thing at a time. • CommonJS • V8
- 21. What makes nodejs Fast? • Node.js is fast by design • Never blocking on I/O means less threads. • This means YOU handle scheduling.
- 22. Node – Java runtime? Java : Node : Concurrent Requests Avg Response time (ms) Requests/second 10 23 422 50 119 416 100 243 408 150 363 411 Concurrent Requests Avg Response time (ms) Requests/second 10 19 509 50 109 453 100 196 507 150 294 506
- 23. Node – Apache runtime? Apache (PHP)
- 24. Node – Apache runtime? Node
- 26. CPU intensive computations • Node -> single threaded execution model • Fibonacci function = one event tick • Blocking your node server completely • IO (DB, Filesystem) is the bottleneck, These calls are completely async
- 28. CPU intensive computations • NPM Modules: • ‘flow’, ‘async’, ‘step’ and ‘Q’. • ‘Threads a GoGo’ natively utilizes threading inside the V8 engine (and therefore relies on a newer release of node.js) • ‘Webworkers’
- 32. NPM • NPM (Node Package Manager) • express • async • grunt • mocha • helmet • socket.io • underscore • ……… (> 50.000)
- 33. Demo! Building a web-app with Express
- 35. Gruntjs
- 36. Gruntjs • Task runner in Node • Automation • Minification, compilation, unit testing, linting, .. • Custom tasks! • Commonjs Compliant
- 37. Gruntjs People will always want to do stupid things, and luckily for those people, there's JSHint -Douglas Crockford
- 38. Demo! Automated tasks with Gruntjs
- 39. Q&A ?