JRuby - The enterprise view

JRuby is often portrayed as the Ruby with brilliant Garbage Collection and native threads but poor startup time and large memory overhead. But how can JRuby really help you in a project, especially when you deal with large corporations that live in the Java world.

Transcript

1. The enterprise
   view
   

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2. One of the best GCs in the world
   Native Threading
   Profiled Optimizations
   Native JIT
   True Parallelism
   (slow startup time)
   

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4. Recap
   “The Java World”
   

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5. Let me tell you a story
   

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6. The Migration
   

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7. Java Database Connectivity
   (JDBC)
   

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8. require 'java'
   !
   java_import 'oracle.jdbc.OracleDriver'
   java_import 'java.sql.DriverManager'
   !
   class OracleConnection
   !
   def initialize (user, passwd, url)
   oradriver = OracleDriver.new
   !
   DriverManager.registerDriver oradriver
   @conn = DriverManager.get_connection url, user, passwd
   end
   !
   def create_statement()
   @conn.create_statement
   end
   !
   def prepare_statement(sql)
   @conn.prepare_statement sql
   end
   !
   def commit()
   @conn.commit
   end
   !
   end
   The Oracle Way
   stmnt = conn.create_statement
   result_set = stmnt.execute_query 'select * from users'
   !
   while result_set.next
   result_set.get_object('ID')
   end
   

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9. require 'java'
   !
   java_import 'oracle.jdbc.OracleDriver'
   java_import 'java.sql.DriverManager'
   require 'sequel'
   !
   class OracleConnection
   def initialize (user, passwd, host, port, sid)
   url = "jdbc:oracle:thin:#{user}/#{passwd}@#{host}:#{port}:#{sid}"
   @client = Sequel.connect url
   end
   !
   def query sql
   @client.fetch(sql)
   end
   end
   The Sequel Way
   client = OracleConnection.new('...')
   client.query('select * from users').each do |row|
   # {
   # id: 1,
   # first_name: 'Harry',
   # last_name: 'Hurtig',
   # user_name: 'hhurtig',
   # }
   end
   

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11. $ which java
    /usr/jdk/jdk1.6.0_51/bin/java
    !
    $ wget http://jruby.org/.../jruby-bin-1.7.6.tar.gz
    $ tar zxf jruby-bin-1.7.6.tar.gz -C ~/jruby
    !
    $ export PATH=~/jruby/bin:$PATH
    !
    $ gem install bundler
    $ bundle install
    

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12. Other Examples
    

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16. Conclusion
    • Not only GC and Native Threads
    • Take advantage of “Java is everywhere”
    • Embrace the JVM ecosystem
    

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17. Attribution
    • http://www.flickr.com/photos/tf28/4444660417 by TF28 ❘ tfaltings.de
    
    • http://www.flickr.com/photos/pedrosz/3993734789 by szeke
    
    • http://www.flickr.com/photos/nzdave/347532488 by (nz)dave
    
    • http://www.flickr.com/photos/cgranycome/9954708374 by CarolineG2011
    
    • http://www.flickr.com/photos/digitalnc/8233509306 by North Carolina Digital Heritage Center
    
    • http://en.wikipedia.org/wiki/File:Java_virtual_machine_architecture.svg by Wikimedia Commons
    
    • http://www.flickr.com/photos/mdavidford/8650284288 by mdavidford
    
    • http://www.flickr.com/photos/apollo1981/1478327767 by apollo1981
    
    • http://www.flickr.com/photos/yggg/287485592 by guccio@จ๪۩ࣾ
    
    • http://www.flickr.com/photos/kakutani/8281245690/ by kakutani
    
    • http://www.flickr.com/photos/barbro2009/5625148914 by Barbro_Uppsala
    

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