Eventmachine talk - Apr 2009 - Calling EventMachine defering a response from

Hi all,

This is my first email. I''m a complete newbie in what comes to
eventmachine
- so please forgive me if I''m saying something foolish.

I''m trying to create a webservice to interface a database with on a
very
restfull way:

Something like:


   - GET / => lists all databases
   - POST / => creates a new database with name=params[:name]
   - GET /DB => Gets columns for database named DB


The goal of the project is just self-learning so ignore if the solution is
over engineered. So I create a sinatra webservice and just created a method
to run sql commands (generated from paths):

Then I installed a MQ (Rabbit) and set up some vhosts and users (
http://github.com/dscape/DBConnector/blob/f3c12e356a9ecac485dc1fe76300fef2c4d39bae/README
)

Then created a simple client that connects to a database, and listen to a
queue for that database. If it receives a request it processes and returns
it in a different queue for sinatra to pick it up (
http://github.com/dscape/DBConnector/blob/f3c12e356a9ecac485dc1fe76300fef2c4d39bae/dbconnector.rb
)

Now the only thing let was sinatras side (line 4,
http://github.com/dscape/DB2WebCC/blob/031c1505556533eaf947d509fabb8664d4b57eb2/lib/db2webcc.rb
):

   - When sql command is ready, publish on queue
   - Expect for response
   - Serve it for customer after rendered in the template

I''m a newbie but I know that''s terrible code. Can someone tell
me how can a
person do this from sinatra? Do I need and how can I use defferable? Will my
crappy code mistakenly give wrong answers for requests as I''m using the
same
Queue and some queries take longer than others? To solve it should I use a
query live DBNAME.SOMEKEY (unique for query) and subscribe to DBNAME.*?

Thanks for the understanding - I''m still learning :)

Nuno
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On 28 Apr 2009, at 19:52, Nuno Job wrote:
>
> I''m a newbie but I know that''s terrible code. Can someone
tell me
> how can a person do this from sinatra? Do I need and how can I use
> defferable?
This facility is provided by thin 1.2.0+[1] and async_sinatra[2].

There are some limited examples in the repos, in the thin repo see
async_*.ru in the example directory, and see the readme in
async_sinatra.

[1] http://github.com/macournoyer/thin or http://github.com/raggi/thin
[2] http://github.com/raggi/async_sinatra
> Thanks for the understanding - I''m still learning :)
>
> Nuno
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