JRubyConf 2009

JRuby on Google App Engine
Extending the Java Platform & APIs
John Woodell
Nov 27, 2009

2

Wednesday, November 25, 2009

What is Google App Engine?
• A cloud-computing platform
• We provide the container and services
• Run your web apps on Google’s infrastructure
• Pay-as-you-go, with free quota to get started

3


WhiteHouse.gov/openforquestions

4


Quotas and Billing
Resource Provided Free Additional Cost
CPU time 6.5 hours/day $0.10/hour

Bandwidth In 1GByte/day $0.10/GByte

Bandwidth Out 1GByte/day $0.12/GByte

Stored Data 1 GB $0.005/GB-day

Emails sent 2000/day to users $0.0001/email
50000/day to admins

5


JRuby on App Engine
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Current Issues with JRuby on App Engine
• Several seconds to “spin-up” a new JRuby instance
• Some gems still need their extensions ported to Java
• Not officially supported , but you have all that you need

+ = ?
7


$ sudo gem install google-appengine
Successfully installed appengine-rack-0.0.4
Successfully installed appengine-jruby-jars-0.0.6
Successfully installed appengine-sdk-1.2.6
Successfully installed appengine-tools-0.0.6
Successfully installed google-appengine-0.0.6
5 gems installed
Installing ri documentation for appengine-rack-0.0.4...
Installing ri documentation for appengine-jruby-jars-0.0.6...
Installing ri documentation for appengine-sdk-1.2.6...
Installing ri documentation for appengine-tools-0.0.6...
Installing ri documentation for google-appengine-0.0.6...
Installing RDoc documentation for appengine-rack-0.0.4...
Installing RDoc documentation for appengine-jruby-jars-0.0.6...
Installing RDoc documentation for appengine-sdk-1.2.6...
Installing RDoc documentation for appengine-tools-0.0.6...
Installing RDoc documentation for google-appengine-0.0.6...

8


App Engine Gems
• Development Gems
– appengine-rack
– appengine-tools dev_appserver.rb & appcfg.rb
– appengine-sdk
– appengine-jruby-jars
• Runtime Gems
– appengine-rack
– dm-appengine
– appengine-apis

9


Dev AppServer
• Customized Jetty server
• Local implementation of services
– LRU memcache
– Disk-backed datastore
– HttpClient-backed URLFetch
• Emulates the production environment
– Sandbox restrictions may be inconsistent,
so run tests on production servers as well

10


Deployment
• Your app lives at
– <app_id>.appspot.com, or
– Custom domain with Google Apps
• Deploying uploads
– Static files
– Resource files
– Other metadata (datastore indexes, cron jobs)
• Admin Console
– dashboards
– manage multiple versions
– view logs

11


App Engine JRuby APIs
• AppEngine::Users
• AppEngine::Datastore
• AppEngine::Memcache
• AppEngine::Mail
• AppEngine::URLFetch
• AppEngine::Images
• AppEngine::Logger
• AppEngine::Testing
• AppEngine::XMPP
• AppEngine::Labs::TaskQueue

12


Users API
• Existing User Account
• Restrict your app to a domain

map '/src' do
use AppEngine::Rack::AdminRequired
use AppEngine::Rack::SSLRequired
run ActionController::Dispatcher.new
end

map '/' do
run ActionController::Dispatcher.new
end
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XMPP API

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Memcache API
• No configuration required
• Same API as Ruby-Memcache
• Keys can be any Symbol or String
• Can store any Marshalable or Serializable object

cache = AppEngine::Memcache.new
cache.set_many({:a => 1, :foo => 1..5})
a, foo = cache.get(:a, :foo)

15


URL Fetch API
• Drop-in replacement for Net::HTTP

AppEngine::URLFetch.fetch(url, options={})

:method
:payload
:headers
:allow_truncated
:follow_redirects
:deadline

16


Small & Modular Frameworks
• Rack
• Sinatra
• Merb/Rails3*
• Duby

* Currently unreleased

17


DataMapper Finders
# Comparisons you’d expect
Zoo.first(:name => 'Galveston')

# The 'gt/lt' means greater/less-than.
Person.all(:age.gt => 30)
Person.all(:age.lt => 40)

# The 'gte/lte' means greather/less-than-or-equal-to.
Person.all(:age.gte => 30)
Person.all(:age.lte => 40)

# The value of a pair is an Array
Person.all(:name => 'Sam', :id => [ 1, 2, 3, 4, 5 ])
Person.all(:name => [ 'bob', 'rick', 'steve' ])

# Ordering
Person.all(:order => [ :age.desc ])

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DataMapper Associations
• has n, has 1
• belongs_to, many_to_one

class Post
include DataMapper::Resource
property :id, Serial
property :message, Text
has n, :comments
end

class Comment
include DataMapper::Resource
property :id, Serial
property :message, Text
belongs_to :post
end

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Demo


Resources
• John Woodell, woodie@google.com
• Google App Engine for JRuby
– http://code.google.com/p/appengine-jruby/
• Google Group
– http://groups.google.com/group/appengine-jruby
• Blog: JRuby on App Engine Blog
– http://jruby-appengine.blogspot.com/

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