Getting Started with Rails on GlassFish (Hands-on Lab) - Spark IT 2010

1. Getting Started with
Rails on GlassFish
(Hands-on Lab)
Arun Gupta, Java EE & GlassFish Guy,
Oracle Corp
blogs.sun.com/arungupta, @arungupta

2. What this session is not ?
• Not a GlassFish tutorial
• Not a Rails tutorial
• Not a MySQL tutorial

3. Software Installed ?
• JDK 1.6.0_XX
• NetBeans 6.8 (“All” or “Ruby” bundle)
• JRuby 1.4.0
• MySQL Community Server
15 minutes

4. What is GlassFish ?

5. What is GlassFish ?

6. GlassFish: It's a Community!

7. GlassFish: Lives on java.net
Since 2005

8. GlassFish: Open Source and
Production Quality

9. GlassFish: Reference Implementation
Java EE 5
Java EE 6

10. GlassFish v3

14. What is Ruby-on-Rails ?
• Full-stack Web development framework in
Ruby
• Popularly known as Rails
• Current Version: Rails 2.3.5
• Rails 3.0 coming

15. Ruby-on-Rails MVC
Incoming
Request
Web Server
ActionController
(Controller)
ActiveRecord ActionView
xxx_controller.rb
(Model) (View)
xxx.rb .rhtml .erb
Database

16. Rails Design Principles
• Convention over Configuration (CoC)
• Common cases easily served
• Encourages standard practices
• Everything simpler and smaller
• Don't Repeat Yourself (DRY)
• Framework written around minimizing repetition
• Agile Development
• No compile, redeploy, restart cycles
• Testing built into the framework

17. JRuby
• Ruby interpreter written in Java
• Current Version: 1.4.0
• 1.5 RC coming soon
• Ruby 1.8.7 compatible
• Some Ruby 1.9 support
• --1.9 flag (80%)

18. JRuby
• Solid performance ( ͋Ruby 1.9)
• Startup is poor, execution usually better than
1.9
• Runs native threads
• Foreign Function Interface (FFI)for C
libraries
• Adopted from Rubinius, CRuby gem
• Runs Rails great!

19. Install JRuby
• CLI: Download & Unzip “jruby-
bin-1.4.0.zip” from jruby.org
• NetBeans “All” or “Ruby” bundle
(pre-installed)

20. Install Rails & GlassFish Gem
• CLI: “jruby -S gem install rails
glassfish”
• NetBeans: Tools -> Ruby Gems
-> New Gems
• Rails pre-installed
• Search “glassfish”, Install 5 minutes

21. Start Database
• Mac/Linux: mysqld_safe --user
root
• Windows: bin/mysqld-nt --user
root
• Installed as service ?
2 minutes

22. Install Database Adapter
“jruby -S gem install
activerecord-jdbcmysql-adapter”
2 minutes

23. Create a Rails App
jruby -S rails helloworld -d mysql
cd helloworld
jruby script/generate jdbc
jruby -S rake db:create
5 minutes

24. Run the App
cd helloworld
jruby -S glassfish
5 minutes

27. Add CRUD features
jruby script/generate scaffold
book title:string author:string
5 minutes

28. Model View Controller
exists app/models/
exists app/controllers/
exists app/helpers/
create app/views/books
exists app/views/layouts/
exists test/functional/
exists test/unit/
create test/unit/helpers/
exists public/stylesheets/
create app/views/books/index.html.erb
create app/views/books/show.html.erb
create app/views/books/new.html.erb
create app/views/books/edit.html.erb
create app/views/layouts/books.html.erb
create public/stylesheets/scaffold.css
create app/controllers/books_controller.rb
create test/functional/books_controller_test.rb
create app/helpers/books_helper.rb
create test/unit/helpers/books_helper_test.rb
route map.resources :books
dependency model
exists app/models/
exists test/unit/
exists test/fixtures/
create app/models/book.rb
create test/unit/book_test.rb
create test/fixtures/books.yml
create db/migrate
create db/migrate/20100310221044_create_books.rb

29. Generate Database Table
jruby -S rake db:migrate
== CreateBooks: migrating ============================
-- create_table(:books)
-> 0.1690s
-> 0 rows
== CreateBooks: migrated (0.1710s) =====================
2 minutes

30. Sample Output
5 minutes

31. GlassFish Gem
http://rubyforge.org/projects/glassfishgem/

32. GlassFish Gem: Options
jruby -S glassfish -h
-c: change the context root
-e: environment
-d: runs as daemon
-P: location of PID file
-l: log file location
-log-level: Logging level (0-7)

33. GlassFish Gem: Recipes

34. Why Rails on GlassFish ? - Agile

35. Why ? - Easy prototyping, yet powerful

36. Why ? - Best of both worlds

37. Why ? - Database Connection Pooling

38. Why ? - Management

39. Why ? - Monitoring

40. Directory-based deployment: How ?
asadmin start-domain
asadmin deploy
--property "jruby.home=JRUBY_HOME"
helloworld
Complete
Absolute
Path
7 minutes

41. Directory-based deployment: Recipes

42. Not Just Rails ...
http://blogs.sun.com/arungupta/entry/totd_53_scaffold_in_merb
http://blogs.sun.com/arungupta/entry/totd_80_sinatra_crud_application

43. And more ...
http://weblogs.java.net/blog/vivekp/archive/2009/04/plugin_any_ruby.html

44. Deployment Options
http://blogs.sun.com/arungupta/entry/totd_81_how_to_use
http://blog.headius.com/2009/04/apache-jruby-rails-glassfish-easy.html

45. Rails on GlassFish: WAR Deployment

46. WAR Deployment: How ?
jruby -S gem install warbler
jruby -S warble
asadmin deploy xxx.war
7 minutes
http://blogs.sun.com/arungupta/entry/totd_73_jruby_and_glassfish

47. WAR Deployment: How in NetBeans ?

48. WAR Deployment: Packaging

49. Rails on GlassFish: Update Center

50. NetBeans: Develop with Pleasure
10 minutes
http://blogs.sun.com/arungupta/entry/screencast_26_develop_run_debug

51. Rails Monitoring
• Basic Monitoring
• jinfo: System properties and VM CLI flags
• jmap: Shared object memory map
• jstack: Stack traces of Java threads
• jstat: Performance statistics on class, JIT compiler, GC, ...
• Advanced
• jconsole / Visual VM
• NewRelic, FiveRuns, ...

52. jConsole
http://blogs.sun.com/arungupta/tags/rubyonrails+jmx

55. Turbo charging your JRuby Startup
• “-client” or “-server” ? (Upto 50%)
• Faster startup or solid runtime ?
• export JAVA_OPTS=”-client -D32”
• Upto 50% improvement
• For Linux: Class Data Sharing
• Delay or disable JRuby's JIT (Upto 10%)
• -X-C
• jruby.compile.mode=OFF
• Avoid spawning “sub-Rubies”
• Nailgun for small JRuby CLI invocations
• Favorite JVM Flags

56. Who loves Rails on GlassFish ?

57. Resources
• glassfish.org
• blogs.sun.com/theaquarium
• glassfish-scripting.dev.java.net
• wiki.glassfish.java.net/Wiki.jsp?
page=JRuby
• blogs.sun.com/arungupta