1. When Two Worlds Collide:
Java and Ruby in the Enterprise
Ben Browning
Creative Commons BY-SA 3.0
ATL JBUG Jan 31 2012

2. Ben Browning
•TorqueBox Core Contributor
•Red Hat Senior Engineer
•twitter.com/bbrowning
•github.com/bbrowning

3. TorqueBox Extended Team

4. Ruby and Java in the
Enterprise

5. TorqueBox in the
Enterprise

6. Why Ruby?

7. Why Ruby?
•Productivity

8. Why Ruby?
•Productivity
•Choice

9. Why Ruby?

11. JRuby
•Marriage of the JVM and Ruby
•the library level integrate at
Lets Java and Ruby

12. JRuby
require ‘java’
java.lang.System.setProperty(‘key’, ‘value’)
java_import java.util.HashMap
hashmap = HashMap.new
hashmap[‘key’] = ‘value’

13. JRuby
require ‘java’
java_import java.util.concurrent.CountDownLatch
java_import java.util.concurrent.TimeUnit
latch = CountDownLatch.new(1)
Thread.new {
sleep 5
latch.count_down
}
latch.await(15, TimeUnit::SECONDS)

14. TorqueBox

15. TorqueBox
•Marriage of JBoss AS7 and JRuby
•the application levelintegrate at
Lets Java and Ruby
•in the same application server
Run Java and Ruby applications

16. But Can’t I Already Run JRuby
Apps in My Java App Server?

17. But Can’t I Already Run JRuby
Apps in My Java App Server?
Yes, if you don’t mind disguising your Ruby
application as a Java application

18. So Why TorqueBox?

19. So Why TorqueBox?
Ruby as a first-class citizen in the
enterprise

20. Familiar to Ruby Devs
Make changes then refresh the browser

21. Familiar to Java Devs
Just JBoss AS7 underneath

22. So Why TorqueBox?
Ruby interfaces to services provided
by the application server

23. Ruby!APIs!/!Programming!Models Java!APIs!/!Programming!Models
Message
Processors
Polyglot
WebSockets Injection
Sinatra Rails Jobs
STOMP POJO REST Servlet
Rack Daemons Tasks Spring JMS JavaEE
JRuby!Component!Deployers!&!Gems Java!Enterprise!Services
JBoss Web
Messaging
Infinispan
Cache
TorqueBox HornetQ
Transactions Core
Quartz
Security TorqueBox
Core PicketLink
JRuby with JIT Managed Services Container
Java Virtual Machine

24. TorqueBox
•applications & Rack
Rails, Sinatra,

25. TorqueBox
•applications & Rack
Rails, Sinatra,
•More than just web
•Messaging
•Jobs
•Services
•Caching

26. Installation For Java Devs
wget http://torquebox.org/release/org/torquebox/
torquebox-dist/2.0.0.beta3/torquebox-
dist-2.0.0.beta3-bin.zip
unzip torquebox-dist-2.0.0.beta3-bin.zip
export TORQUEBOX_HOME=`pwd`/
torquebox-2.0.0.beta3
export PATH=$TORQUEBOX_HOME/jruby/bin:$PATH

27. Installation For Ruby Devs
rvm install jruby-1.6.5.1
rvm use jruby-1.6.5.1
jruby -J-Xmx1024m -S gem install torquebox-server
--pre

28. Usage
torquebox deploy ~/my_ruby_app
torquebox run

30. TorqueBox
•applications & Rack
Rails, Sinatra,
•More than just web
•Messaging
•Jobs
•Services
•Caching

31. Messaging

33. Message Processors
app/models/print_handler.rb
include TorqueBox::Messaging
class PrintHandler < MessageProcessor
def on_message(body)
puts "Processing #{body} of #{message}"
end
end

34. Message Processors
config/torquebox.yml
queues:
/queues/receipts:
messaging:
/queues/receipts:
PrintHandler:
concurrency: 5

35. Backgroundable

36. Regular Class
class Something
def foo
sleep 5
end
end

37. Blocking Invocations
something = Something.new
something.foo

38. Backgroundable
class Something
include TorqueBox::Messaging::Backgroundable
def foo
end
def bar
end
end

39. Non-Blocking Invocations
something = Something.new
something.background.foo

40. See The Future
something = Something.new
future = something.background.foo

41. See The Future
future.started?
future.complete?
future.error?
future.result

42. See The Future
class Something
def foo
...
count += 1
future.status = count
...
end
end

43. See The Future
# on the 'client' side
future.status_changed?
future.status # => 42

44. Scheduled Jobs

45. Scheduled Jobs
app/jobs/newsletter_sender.rb
class NewsletterSender
def run
subscriptions = Subscription.find(:all)
subscriptions.each do |e|
send_newsletter(e)
end
end
end

46. Scheduled Jobs
config/torquebox.yml
jobs:
monthly_newsletter:
description: first of month
job: NewsletterSender
cron: ‘0 0 0 1 * ?’

47. Services

48. Services
app/services/time_machine.rb
class TimeMachine
def initialize(opts)
@queue = Queue.new(opts['queue'])
end
def start
Thread.new { run }
end
def stop
@done = true
end
end

49. Services
app/services/time_machine.rb
class TimeMachine
def run
until @done
@queue.publish(Time.now)
sleep(1)
end
end
end

50. Services
config/torquebox.yml
services:
TimeMachine:
config:
queue: /queue/time

51. Caching

53. Rails Caching
config/application.rb
module MyApp
class Application < Rails::Application
...
config.cache_store = :torque_box_store
end
end

54. Explicit Caching
include ActiveSupport::Cache
myCache =
TorqueBoxStore.new(:name => 'MyCache',
:mode => :replicated,
:sync => true)

55. Clustering
torquebox run --clustered

56. Better Java Integration
•Deploy Java and Ruby side-by-side
•Injection of Java components -
CDI, objects bound to JNDI, etc
•Send JMS messages in vice-versa
consume in Ruby and
Java to
•Share caches between Java and
Ruby
•PicketLink authentication in Ruby
•Java Management Tools

57. Java Component Injection
# messaging destinations
inject(‘/queues/something’)
# CDI resources
inject(com.mycorp.MyJavaService)
# JNDI entries
inject(‘java:comp/env/that_thing’)
# JBoss MSC Services
inject(‘jboss.web’)

58. Java & Ruby Messaging
producer.java
InitialContext ic = new InitialContext();
ConnectionFactory cf = (ConnectionFactory) ic.lookup(“/ConnectionFactory”);
Queue queue = (Queue) ic.lookup(“/queues/my_queue”);
Connection connection = cf.createConnection();
Session session = connection.createSession(false,
Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = session.createProducer(queue);
TextMessage message = session.createTextMessage(“hi”);
producer.send(message);

59. Java & Ruby Messaging
consumer.rb
queue = inject(‘/queues/my_queue’)
message = queue.receive(:decode => false)
puts message.text
# prints “hi”

60. PicketLink & Ruby
authenticator = TorqueBox::Authenticator[‘jmx-console’]
authenticator.authenticate(‘username’, ‘password’) do
some_authenticated_action
end

61. Java Management

62. Resources
•http://torquebox.org
•https://github.com/torquebox
•#torquebox on FreeNode
•@torquebox on Twitter

63. Questions?
Don’t Be Shy
Image Attributions:
Tools - http://www.flickr.com/photos/jrvogt81/4264575563/
Mailboxes - http://www.flickr.com/photos/joanet/5094833752/
Now and Laters - http://www.flickr.com/photos/jcorduroy/3725077603/
Hand Calendar - http://www.flickr.com/photos/joelanman/366190064/
Cruise Ship Staff - http://www.flickr.com/photos/maethlin/2547037443/