![Basic Versioning Rules
After bundling, always check your Gemfile.lock
into version control
After updating your Gemfile, always run
bundle install first.
When running an executable, ALWAYS use
bundle exec [command]
The only exception is the rails command!
http://yehudakatz.com/2011/05/30/gem-versioning-and-bundler-doing-it-right/](https://image.slidesharecdn.com/jrubyintheenterpriseslideshare-110717181753-phpapp02/75/jruby-in-the-enterprise-64-2048.jpg?cb=1668124244)
JRuby in the enterprise
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This is from a talk I gave at UberConf 2011 in Denver, CO.
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JRuby in the enterprise
- 1. JRuby in the Enterprise
- 2. About Me Advisory Engineer at Constant Contact Spent several years working for Sun/Javasoft in the distributed computing group Email: jerry@gulla.com Twitter: @jerrygulla Github: github.com/jgulla
- 3. What is JRuby? Just a Ruby interpreter running on the JVM Ruby 1.8.7 & 1.9.2 compatible.
- 4. Text-To-Join Distributed app Written in Ruby as a Rails app Four rails apps, actually UI, API, Console, SMS Processor.
- 7. JRUBY.ORG
- 8. Why Ruby? Ruby is…A dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write.
- 10. WHY SHOULD YOU SWITCH TO RUBY? IF YOU ARE HAPPY WITH PERL OR PYTHON, YOU DON'T HAVE TO. BUT IF YOU DO FEEL THERE MUST BE A BETTER LANGUAGE, RUBY MAY BE YOUR LANGUAGE OF CHOICE. LEARNING A NEW LANGUAGE IS HARMLESS. IT GIVES YOU NEW IDEAS AND INSIGHTS. YOU DON'T HAVE TO SWITCH, JUST LEARN AND TRY IT. YOU MAY FIND YOURSELF COMFORTABLE ENOUGH WITH RUBY TO DECIDE TO SWITCH TO IT. -- YUKIHIRO MATSUMOTO (“MATZ”) HTTP://LINUXDEVCENTER.COM/PUB/A/LINUX/2001/11/29/ RUBY.HTML
- 11. Rails 3.x “Optimized for programmer happiness”.
- 12. Why Not Grails? Grails is great Not as big of a break with Java Wanted a bigger shift to bring new ways of doing things into perspective.
- 13. Why JRuby? High performance JVM Highly Tuned Real threading Many “pure Ruby” shops using JRuby just for this Vast array of libraries No need to abandon Java libraries.
- 14. Why JRuby Continued Deployment Options Can deploy as a WAR file Monitoring Options JVM tools to monitor all available Speed of Development.
- 15. Don’t Freak the Ops Guys Out HTTP://UPLOAD.WIKIMEDIA.ORG/WIKIPEDIA/EN/F/F4/THE_SCREAM.JPG
- 17. Concurrency is a Myth HTTP://WWW.IGVITA.COM/2008/11/13/CONCURRENCY-IS-A-MYTH-IN-RUBY/
- 18. ILYA GRIGORIK HTTP://WWW.IGVITA.COM/ABOUT/ JRUBY IS, IN FACT, THE ONLY RUBY IMPLEMENTATION THAT WILL ALLOW YOU TO NATIVELY SCALE YOUR RUBY CODE ACROSS MULTIPLE CORES. BY COMPILING RUBY TO BYTECODE AND EXECUTING IT ON THE JVM, RUBY THREADS ARE MAPPED TO OS THREADS WITHOUT A GIL IN BETWEEN - THAT'S AT LEAST ONE REASON TO LOOK INTO JRUBY. HTTP://WWW.IGVITA.COM/2008/11/13/CONCURRENCY-IS-A-MYTH-IN-RUBY/
- 20. “Enterprise” JRuby Cont. Maven Liquibase JDBC JNDI Containers You’re favorite commercial, open-source or home- grown library.
- 21. Let’s Begin http://commons.wikimedia.org/wiki/File:Begin_road.JPG
- 23. Ruby Version Manager HTTPS://RVM.BEGINRESCUEEND.COM/
- 24. Installing RVM Via git repo (preferred method) bash < <(curl -s https://rvm.beginrescueend.com/install/rvm) Other methods at https://rvm.beginrescueend.com/rvm/install/
- 25. Install JRuby (via rvm) rvm install jruby-1.6.3 When it’s done, use it: rvm use jruby-1.6.3 List of other ruby versions to install: rvm list known List versions of ruby you have installed: rvm list
- 26. JRuby Without RVM Assume Java, JRuby in your path jruby -S gem ...
- 27. Install Rails gem install rails Can pick a specific version with a “-v” flag.
- 28. Create Your Rails App Jruby.org hosts a rails template Sets things up to run under native ruby or JRuby You can do this yourself, but it’s handier to start this way rails new uberconf_demo --template=http://jruby.org Works with native ruby or JRuby.
- 31. Demo
- 32. Packaging Your App http://en.wikipedia.org/wiki/File:Distribution_differences.jpg
- 33. JRuby/Rails/WAR files In the Java world, WAR files are standard Fortunately, we have bundler Gem to package your Rails app as a WAR file Can even make it “Executable” for stand-alone testing! http://caldersphere.rubyforge.org/warbler/
- 34. Install it Easy! gem install warbler
- 35. Run It http://en.wikipedia.org/wiki/File:Jeanette_Kwakye_cropped.jpg Easy! warble war
- 36. Other Useful Options warble compiled # Feature: precompile all Ruby files warble config # Generate a configuration file to customize your archive warble executable # Feature: make an executable archive warble gemjar # Feature: package gem repository inside a war warble pluginize # Install Warbler tasks in your Rails application warble version # Display version of Warbler warble war # Create the project war file warble war:clean # Remove the project war file warble war:debug # Dump diagnostic information
- 37. Maven In the Java world, Maven is still pretty popular For better or for worse You can use Maven to invoke warbler to package your app.
- 40. Database Migrations Rails uses Rake for ActiveRecord migrations Nice, but Hard to scale to multiple developers Hard to deploy to QA/Production systems without using ruby toolset Paranoid DBAs can’t see the SQL before running it.
- 41. Enter liquibase.org Version control for your database Other frameworks (Grails) will be adopting it for migrations Language/Database agnostic.
- 42. Liquibase Nothing special about using Liquibase with Rails Use ActiveRecord migrations for initial dev/testing, then migrate to Liquibase When ready, just take “snapshot” of DB config, then roll out new Liquibase changesets.
- 43. Handy Liquibase Commands Generate initial changelog: java -jar liquibase.jar --classpath=mysql-connector- java-5.1.14-bin.jar --url=jdbc:mysql://localhost/ api_development --driver=com.mysql.jdbc.Driver -- username=demo --password=password -- changeLogFile=db-changelog.xml generateChangeLog Drop all tables so you can start over: dropAll Run updates against a DB: liquibase --changeLogFile=myChangeLog update Just output SQL, don’t run: updateSQL
- 45. Liquibase with Rails Directly https://github.com/redbeard/liquibase-rails Supposed to add “drop in” migration tasks for JRuby/Rails.
- 47. JNDI Database Access DATABASE.YML
- 48. Servlet Filters You’ll need a custom web.xml config Copy WARBLER_HOME/web.xml.erb to config/web.xml.erb Look for it at ~/.rvm/gems/jruby-1.6.2/gems/ warbler-1.3.1/web.xml.erb HTTP://EN.WIKIPEDIA.ORG/WIKI/FILE:DICHROIC_FILTERS.JPG
- 50. Java Integration Nothing special, just the usual JRuby/Java integration Looks for JARs in the container classpath, WAR or in yourapp/lib
- 52. Tips, Tricks and Lessons http://en.wikipedia.org/wiki/File:Coolidge_after_signing_indian_treaty.jpg
- 53. Warbler Config generate a warbler config file warble config
- 55. Pre-Compile Ruby Classes config.features = %w(compiled)
- 57. Set JNDI Source Name
- 58. Set Root Path for App By default, the root of your app is the WAR name This may not be what you want.
- 59. Set the Root Path Create file jboss-web.xml in root of app directory Tell warbler to include it via warble.rb
- 60. Bundle Up Files into A Gem Can be much faster to build/deploy depending on how you do it (there are a lot of files!) Make sure to test it
- 61. Make Your War Executable Command Line: warble executable war In warble.rb: config.features = %w(executable)
- 62. Rails Console Rails has a “Console Mode” for testing Great for trying out ActiveRecord queries, etc. Just use “rails console” to invoke it.
- 63. Gem Versions Be sure to lock down Gem versions when you’re happy with them Don’t want any last minute “upgrades!” Use bundler Put Gemfile.lock under source control.
- 64. Basic Versioning Rules After bundling, always check your Gemfile.lock into version control After updating your Gemfile, always run bundle install first. When running an executable, ALWAYS use bundle exec [command] The only exception is the rails command! http://yehudakatz.com/2011/05/30/gem-versioning-and-bundler-doing-it-right/
- 65. Handle Database Connection Outage This is the “default” 500 error page.
- 66. You can Customize this but... You can do better
- 67. Create “Status” URL Want a well known URL that Nagios or a Load Balancer can check Should return something useful (and specific to your test).
- 68. Insert Your Own Middleware Create lib/db_check.rb
- 69. Insert Your Own Middleware Insert it into the stack (application.rb)
- 71. You Now Have Generic Status Ability Extend for other things useful to your application.
- 73. IDEs
- 78. Resources
- 79. Books
- 80. Websites http://www.jruby.org/ http://jrubyconf.com/ http://vimeo.com/groups/87639 (talks from 2010 JRubyConf) http://www.engineyard.com/open-source
- 82. Questions?
- 83. Thank You! Don’t forget to fill out a session evaluation!