Talk about how FiberJS resolves asynchronous issues within callbacks hell

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. db.connect()
conn.query
(“select”)
loop
{
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