Ruby On Google App Engine 2nd Athens Ruby Me

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

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

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

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

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

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

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

Ruby On Google App Engine 2nd Athens Ruby Me

by Panagiotis Papadopoulos on Oct 17, 2009

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