Asynchronous done right with Meteor

my talk at the #4th meteorjs paris meetup presenting how and why meteorjs switched to fibers to better deal with asynchronous code and void the callback pyramid of doom.

Transcript

1. #4
2. Meteor Asynchronous done right with Meteor
3. Agenda intro problem solution outro
4. My name is Abderrazak BOUADMA I’m Software Engineer (java) works at @mbtdoor linkedIn G+
5. Thanks to for their support to Meteor Meetup
6. intro
7. Meteor is a platform built on top of NodeJS to build cutting edge fast web applications.
8. created to Get Things Done locked free approach scalable to the infinity … and beyond Embraces Simplicity
9. created to Get Things Done locked free approach scalable to the infinity … and beyond Embraces Simplicity
10. created to Get Things Done locked free approach scalable to the infinity … and beyond Embraces Simplicity
11. created to Get Things Done locked free approach scalable to the infinity … and beyond Embraces Simplicity
13. but ...
14. still have a long way to go.
15. a problem :(
16. Event Loop is a programming construct that waits for and dispatches events or messages in a program
17. http://blog.mixu.net/2011/02/01/understanding-the-node-js-event-loop/
18. Synchronous !
19. process fork
20. threads
21. single thread
22. while(new Date().getTime() < now + 1000) { // do nothing }
23. all I/O is evented and asynchronous
24. var fs = require('fs'); fs.readFile( __dirname + '/test.txt', function (err, data) { if (err) { throw err; } console.log(data.toString()); });
26. loop { db.connect() conn.query (“select”) conn.execute(“insert”) conn.execute(“delete”)
27. callback pyramid of
28. a solution :)
29. Fibers https://github.com/laverdet/node-fibers
30. allows us to write asynchronous code without callbacks
31. futures
34. var fs = require('fs'); fs.readFile( __dirname + '/test.txt', function (err, data) { if (err) { throw err; } }); console.log(data.toString());
35. var fs = require('fs'); fs.readFile( __dirname + '/test.txt', function (err, data) { if (err) { throw err; } }); // console.log(data.toString()); won’t run as the ‘data’ // variable is not accessible at this point.
36. Solution var fs = require('fs'); var d; fs.readFile( __dirname + '/test.txt', function (err, data) { if (err) { throw err; } d = data; }); console.log(d.toString());
38. Resources http://bjouhier.wordpress.com/2012/03/11/fibers-and-threads-in-node-js-what-for/ http://meteorhacks.com/fibers-eventloop-and-meteor.html http://blog.mixu.net/2011/02/01/understanding-the-node-js-event-loop/ https://github.com/laverdet/node-fibers
39. Thanks