Placeholder for a Two-Line Title International Theme Ruby on Google App Engine Panagiotis Papadopoulos http://6pna.com - http://webz.gr 2nd Athens Ruby Meetup

From Ruby to JRuby We know Ruby MRI but Ruby runs on JVM too Like Ruby but runs on top of JVM JRuby is mature Ruby Thread are java threads GC is the bullet proof Java GC Java Unicode Compiled code GC and threading work seamlessly Huge variety of libaries deploy RoR with a single .war But ... gems need native extensions great performance needs JVM knowledge

Like Ruby but runs on top of JVM

JRuby is mature

Ruby Thread are java threads

GC is the bullet proof Java GC

Java Unicode

Compiled code

GC and threading work seamlessly

Huge variety of libaries

deploy RoR with a single .war

But ...

gems need native extensions

great performance needs JVM knowledge

Google App Engine What is App Engine exciting running on Google infrastructure limited & has unique methodologies Java & Python only scaling to infinity having an integrated enviroments almost free What is What is not Shared Hosting VPS a server to port my projects run commodity software (ex. phpBB) RDBMS a technology for noobs

exciting

running on Google infrastructure

limited & has unique methodologies

Java & Python only

scaling to infinity

having an integrated enviroments

almost free

Shared Hosting

VPS

a server to port my projects

run commodity software (ex. phpBB)

RDBMS

a technology for noobs

Why do we need JRuby Because it can execute on App Engine JVM Learn the GAE limitations and tool set no relational database although GQL make it easier 1000 files upload limit not writable filesystem no custom TCP, UDP connection etc free up to 6.5 cpu hours index everything (or most) So what is good? no worries about scaling XMPP, Cron, Task Queue, Versions integrated environment free for most projects really cool

Learn the GAE limitations and tool set

no relational database although GQL make it easier

1000 files upload limit

not writable filesystem

no custom TCP, UDP connection

etc

free up to 6.5 cpu hours

index everything (or most)

So what is good?

no worries about scaling

XMPP, Cron, Task Queue, Versions

integrated environment

free for most projects

really cool

Where is Ruby and where is Rails? Not so straightforward a lot but tricky ORM through DataMapper memcache, actionmailer need patching console What works What does not work native extensions activerecord

a lot but tricky

ORM through DataMapper

memcache, actionmailer need patching

console

native extensions

activerecord

How do we start? You are luckier now but wait for Rails 3 Appengine-Jruby for the rescue streamlines the process fetched jruby-rack, jruby, appengine-java-skd local server console deploy in a breeze Is that easy? not at all you need to package gems into jars (warble) jruby rack runs below rails/sinatra/merb Java exceptions restart server when testing :( Awesome admin environment, take a look

Appengine-Jruby for the rescue

streamlines the process

fetched jruby-rack, jruby, appengine-java-skd

local server

console

deploy in a breeze

Is that easy?

not at all

you need to package gems into jars (warble)

jruby rack runs below rails/sinatra/merb

Java exceptions

restart server when testing :(

Awesome admin environment, take a look

Integration, control, versioning, stats, tickets all in a blink. PanosJee “ ”

More reading Don 't miss http://delicious.com/panosjee/jruby lots of stuff I came across about jruby/gae http://code.google.com/p/appengine-jruby/ don 't start without it http://olabini.com/blog/ major contributor http://www.web2py.com/ if you are serious about GAE and want a real app http://www.sinatrarb.com/ ideal platform for Ruby on GAE http://bike-races.appspot.com/ the awesome demo

http://delicious.com/panosjee/jruby

lots of stuff I came across about jruby/gae

http://code.google.com/p/appengine-jruby/

don 't start without it

http://olabini.com/blog/

major contributor

http://www.web2py.com/

if you are serious about GAE and want a real app

http://www.sinatrarb.com/

ideal platform for Ruby on GAE

http://bike-races.appspot.com/

the awesome demo

Thank you! Ruby Greece is maturing! http://6pna.com :: http://www.webz.gr