JRuby: What, Why, How...Do it Now!

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1 JRuby: What, Why, How...Do it Now! Thomas E Enebo, JRuby Core Developer Charles Oliver Nutter, JRuby Core Developer TS-5416

2 Learn how awesome JRuby is Learn how much nicer Java technologybased APIs can be Get a taste for NetBeans Ruby and Rails Ask those burning questions you have 2008 JavaOne SM Conference java.sun.com/javaone 2

3 The JRuby Guys Charles Oliver Nutter and Thomas Enebo Longtime Java code developers (10+ yrs each) Engineers at Sun Microsystems for 1 yr Full-time JRuby developers Also working on Java Virtual Machine (JVM) dynlang support Wide range of past experience C, C++, C#, Perl, Python, Delphi, Lisp, Scheme Java Platform, Enterprise Edition (Java EE) and Java Platform, Micro Edition (Java ME), JINI (JINI), WS technologies 2008 JavaOne SM Conference java.sun.com/javaone 3

4 What is Ruby? Dynamically-typed pure object-oriented programming language Focus on simplicity, productivity, and fun Interpreted Open source, written in C Implementation is the Specification Created 1993 by Yukihiro Matz Matsumoto More powerful than Perl and more OO than Python Very active community, wide range of apps 2008 JavaOne SM Conference java.sun.com/javaone 4

5 Ruby Quick Tour: Objects Everywhere Pure Object-Oriented Language Look mom...no primitives 7.class => Fixnum hello.length => 5 3.times { i puts #{i}: No place like home } => 1: No place like home 2: No place like home 3: No place like home 2008 JavaOne SM Conference java.sun.com/javaone 5

6 Ruby Quick Tour: Sweet Sugar Syntactical sugar Strings: foo Arrays: ['one', 1, Ein.new] Associative Arrays: {'a' => 3, 'b' => 4} Regular Expressions: /^foo.*bar/ 2008 JavaOne SM Conference java.sun.com/javaone 6

7 Ruby Quick Tour: Dynamic Typing Dynamically-Typed Language (Duck-Typing) If it quacks like a duck and waddles like a duck then... def make_it_waddle(waddler) waddler.waddle end make_it_waddle(duck.new) make_it_waddle(penguin.new) make_it_waddle(octopus.new) 2008 JavaOne SM Conference java.sun.com/javaone 7

8 Ruby Quick Tour: Classes and Modules Ruby classes are like Java classes Ruby modules mixin behavior module ShapeStuff def diameter return 2 end end class Circle include ShapeStuff... end Circle.new(4).diameter => JavaOne SM Conference java.sun.com/javaone 8

9 Ruby Quick Tour: Blocks Anonymous methods you can pass around and invoke Add block to be invoked on end of method call Removes repetitive code list.each { element... do something...} Internalizes transactional code File.open(fname) { file line = file.gets...} Makes nice APIs 2008 JavaOne SM Conference java.sun.com/javaone 9

10 Ruby Quick Tour: Metaprogramming Open Classes Dynamically generate class/module Modify existing class/module Add, remove, alias, or replace methods include a module Add or remove class or instance variables Special handler methods method_missing const_missing 2008 JavaOne SM Conference java.sun.com/javaone 10

11 JRuby Java technology implementation of Ruby language It's just Ruby! Started in 2002, open source, many contributors Ola Bini, Marcin Mielzinsky, Nick Sieger, Bill Dortch, Vladimir Sizikov, MenTaLguY Aiming for compatibility with current Ruby version Ruby patchlevel 111 (114 was just released) Improvements on Ruby Native threading, better performance Plays nice with Java technology Call to Ruby from Java technology via JSR223, BSF, Spring Use Java classes from Ruby (e.g. Script Java) 2008 JavaOne SM Conference java.sun.com/javaone 11

12 Interactive Ruby 2008 JavaOne SM Conference java.sun.com/javaone 12

13 What are People Doing with JRuby? Swing GUI development Makes Swing much nicer to use, easier to handle Tooling for IDEs JRuby's parser enables NetBeans, Eclipse communities Graphics Ruby + graphics = cool demos JRuby on Rails Better deployment options, better performance 2008 JavaOne SM Conference java.sun.com/javaone 13

14 Swing GUI Development Swing API is very large, complex Ruby magic simplifies most of the tricky bits Java language is very verbose Ruby makes Swing actually fun No consistent cross-platform GUI library for Ruby Swing works everywhere Java technology does (everywhere) No fire-and-forget execution No dependencies: any script works on any JRuby install 2008 JavaOne SM Conference java.sun.com/javaone 14

15 Swing in Ruby 2008 JavaOne SM Conference java.sun.com/javaone 15

16 Swing Options Cheri - Builder-like DSL syntax Profligacy - Rubified layout expression language Trivial event binding without listeners MonkeyBars - Leverage GUI builders MVC structure 2008 JavaOne SM Conference java.sun.com/javaone 16

$") { form size 300, 300 box_layout form, :Y_AXIS content_pane { background :WHITE } } button("event binding is nice") { btn on_click { btn.$

17 Cheri include Cheri::Swing frame = swing.frame("swing builders!") { form size 300, 300 box_layout form, :Y_AXIS content_pane { background :WHITE } } button("event binding is nice") { btn on_click { btn.text = "You clicked me!" } } frame.visible = true 2008 JavaOne SM Conference java.sun.com/javaone 17

18 Profligacy class ProfligacyDemo import javax.swing.* include Profligacy def initialize layout = = Swing::LEL.new(JFrame, layout) { cmps, ints cmps.translate = JButton.new("Translate") cmps.input = JtextField.new; cmps.result = JLabel.new translator = proc { id, evt original translation = = translation }... ints.translate = {:action => translator} 2008 JavaOne SM Conference java.sun.com/javaone 18

19 Monkeybars class RssController < Monkeybars::Controller set_view "RssView" set_model "RssModel" close_action :exit add_listener :type => :mouse, :components => ["gobutton", "articlelist"] def go_button_mouse_released(view_state, event) model.feed_url = view_state.feed_url content = = RSS::Parser.parse(content, false) model.articles { art art.title} update_view JavaOne SM Conference java.sun.com/javaone 19

20 JRuby Enables Tooling JRuby's parser used by most Ruby IDEs NetBeans Ruby Support Eclipse RDT/RadRails/Aptana, DLTK, 3 rd Rail IntelliJ (not parser, but other areas) Jedit NetBeans community is the best right now 2008 JavaOne SM Conference java.sun.com/javaone 20

21 NetBeans Project Teaser 2008 JavaOne SM Conference java.sun.com/javaone 21

22 NetBeans Ruby Talks LAB-8400: Developing (J)Ruby on Rails Applications with the NetBeans IDE Tuesday, 3:20PM-5:20PM TS-5249: The NetBeans Ruby IDE: You Thought Rails Development Was Fun Before Wednesday, 2:50PM-3:50PM 2008 JavaOne SM Conference java.sun.com/javaone 22

23 Pretty Graphics! Processing is an open source programming language and environment for people who want to program images, animation, and interactions. Basically a cool Java library for 2D graphics Ruby-Processing wraps Processing with JRuby Cool, rubified 2D graphics environment for you Eye-candy demos for us Thanks to Jeremy Ashkenas for putting these together 2008 JavaOne SM Conference java.sun.com/javaone 23

24 Processing: Pretty Graphics 2008 JavaOne SM Conference java.sun.com/javaone 24

25 Introducing Ruby on Rails A Full-stack MVC web development framework Open Source (MIT), Many Contributors Written in Ruby Single-Threaded design First released in 2004 by David Heinemeier Hansson Ruby and Rails book sales are outselling Perl book sales Shipping with Leopard 2008 JavaOne SM Conference java.sun.com/javaone 25

26 Ruby on Rails Precepts Convention over Configuration Why punish the common cases? Encourages standard practices Everything simpler and smaller Don't Repeat Yourself (DRY) Framework written around minimizing repetition Repetitive code harmful to adaptability Agile Development Environment No recompile, deploy, restart cycles Simple tools to generate code quickly Testing built into framework 2008 JavaOne SM Conference java.sun.com/javaone 26

27 Why JRuby on Rails Greatly simplified application development Less Rails code than Java application configuration Create applications quickly Deployment to Java application servers (GlassFish) Easy Integration with existing Java Technology Better performance, scaling 2008 JavaOne SM Conference java.sun.com/javaone 27

28 Rails Quick Tour: Components ActiveRecord Data-driven ORM ActionPack View and controller support ActiveResource RESTful exposure of resources ActionMailer ActiveSupport Unicode, json, miscellaneous helpers 2008 JavaOne SM Conference java.sun.com/javaone 28

29 Ruby on Rails Demo 2008 JavaOne SM Conference java.sun.com/javaone 29

30 Production JRuby on Rails Oracle's Mix digg-like social customer site mix.oracle.com Sun's MediaCast file distribution portal mediacast.sun.com ThoughtWorks' Mingle collaborative project mgmt mingle.thoughtworks.com Sonar code/project analysis tool sonar.hortis.ch More on the way! 2008 JavaOne SM Conference java.sun.com/javaone 30

31 JRuby on Rails Talks TS-4806: JRuby on Rails: Web Development Evolved Wednesday, 1:30PM-2:30PM TS-6490: JRuby on Rails Deployment: What They Didn t Tell You Thursday, 10:50AM-11:50AM BOF-5111: Scripting in GlassFish Project Tuesday, 8:30PM-9:20PM LAB-8400: Developing (J)Ruby on Rails Applications with the NetBeans IDE Tuesday, 3:20PM-5:20PM TS-5249: The NetBeans Ruby IDE: You Thought Rails Development Was Fun Before Wednesday, 2:50PM-3:50PM 2008 JavaOne SM Conference java.sun.com/javaone 31

32 Other JRuby and Ruby-related Talks PAN-5345: The Script Bowl: A Rapid-Fire Comparison of Scripting Languages Wednesday, 9:30AM-10:30AM BOF-4807: JRuby at ThoughtWorks Wednesday, 7:30PM-8:30PM TS-4868: From Java Technology to Ruby...and Back Thursday, 4:10PM-5:10PM BOF-6554: PHP, Ruby and friends - going mobile Thursday, 8:30PM-9:20PM TS-6050: Comparing JRuby and Groovy Wednesday, 1:30PM-2:30PM Friday, 1:30PM-2:30PM 2008 JavaOne SM Conference java.sun.com/javaone 32

33 Summary JRuby gives Java technology access to the Ruby language Powerful, terse, and a whole lot of fun! JRuby gives Java developers access to Ruby on Rails The way web development should be Driving force behind the new way in web frameworks Many People are using JRuby today Production ready Fast...and still moving forward! 2008 JavaOne SM Conference java.sun.com/javaone 33

34 Thomas E Enebo, JRuby Core Developer Charles Oliver Nutter, JRuby Core Developer TS JavaOne SM Conference java.sun.com/javaone 34

The Script Bowl Featuring Groovy, JRuby, Jython and Scala. Raghavan Rags N. Srinivas CTO, Technology Evangelism

The Script Bowl Featuring Groovy, JRuby, Jython and Scala Raghavan Rags N. Srinivas CTO, Technology Evangelism The Script Bowl: Groovy Style Guillaume Laforge VP Technology at G2One, Inc. Groovy Project