PRDC11-Jruby-ironruby
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PRDC11-Jruby-ironruby Presentation Transcript

  • 1. (track sponsor) Jruby & Iron Ruby Amir BarylkoMonday, June 13, 2011
  • 2. AMIR BARYLKO JRUBY & IRON RUBY PRAIRIE DEV CON JUN 2011Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 3. WHO AM I? • Architect • Developer • Mentor • Great cook • The one who’s entertaining you for the next while!Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 4. CONTACT AND MATERIALS • Contact me: amir@barylko.com, @abarylko • Blog:http://www.orthocoders.com • Site:http://www.maventhought.com • Download: http://www.orthocoders.com/presentations.Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 5. RUBY INTRO Dynamic languages Toolbox FeaturesAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 6. DYNAMIC LANGUAGES  High level  Dynamically typed  Runtime over compile time  Closures  Reflection  Platform independentAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 7. DEVELOPERS TOOLBOX • Make your toolbox grow! • The right tool for the job • Not a replacement • Combine strengths • Problem solvingAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 8. WELCOME TO RUBY  Created in mid-90s by  Several implementations: “Matz” Matsumoto in Japan MRI, YARB, JRuby  Smalltalk, Perl influences  Totally free!!  Dynamic typing  Object Oriented  Automatic memory managementAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 9. RUBY FEATURES  Everything is an expression  Operator overloading, flexible syntax  Metaprogramming  Powerful standard library  Closures  Garbage collection  ExceptionsAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 10. RUBY SUPPORT  Hundreds of books  Lots of great web sites: basecamp, twitter, 43  User conferences all over things, hulu, scribd, the world slideshare, Justin.tv  Active community (you can  Lots of web frameworks create a conference in your inspired by Ruby on Rails own city and top Ruby coders will go there to teach others, invite them and see)Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 11. RUBY LANGUAGE Basic Types Control Structures Methods ModifiersAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 12. BASIC TYPES  Numbers 1.class => Fixnum 1.1.class => Float (120**100).class => Bignum 3.times {puts “he “}Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 13. BASIC TYPES II • Strings he + he => he he “Thats right” => Thats right He said “hi” => He said “hi” “He said “hi”” => He said “hi” “1 + 1 is #{1+1}” => 1 + 1 is 2 "#{Ho! *3}Merry Christmas" =>Ho! Ho! Ho! Merry ChristmasAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 14. BASIC TYPES III  Arrays a = [1, 5.5, “nice!”] 1 == a.first 1 == a[0] nil == a[10] a[1] = 3.14 a.each {|elem| puts elem} a.sortAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 15. BASIC TYPES IV • Hashes h = {“one” => 1, 1 => “one”} h[“one”] == 1 h[1] == “one” h[“two”] == nil h.keys == [“one”, 1] (or is it [1, “one”] ?) h.values == [“one”, 1] (or is it [1, “one”] ?) h[“one”] = 1.0Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 16. BASIC TYPES V  Symbols: constant names. No need to declare, guaranteed uniqueness, fast comparison :apple == :apple :orange != :banana [:all, :those, :symbols] {:ca => “Canada”, :ar => “Argentina”, :es => “Spain”}Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 17. CONTROL STRUCTURES  if if count < 20 puts “need more” elsif count < 40 puts “perfect” else puts “too many” end  while while count < 100 && need_more buy(1) endAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 18. CONTROL STRUCTURES II  Statement modifiers buy while need_more? buy(5) if need_more? buy until left == 0 buy unless left < 5Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 19. CONTROL STRUCTURES III • Case case left when 0..5 dont_buy_more when 6..10 buy(1) when 10..100 buy(5) endAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 20. METHODS  Simple def play(movie_path) .... end  Default arguments def play(movie_path, auto_start = true, wrap = false) .... endAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 21. METHODS II  Return value: the last expression evaluated, no need for explicit return def votes(voted, num_votes) voted && num_votes || nil end  No need for parenthesis on call without arguments (same syntax to call a method and a field) buy() == buy movie.play() == movie.playAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 22. METHODS III  No need also with arguments (but careful!! only if you know what you are doing) movie.play “Pulp fiction”, false, trueAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 23. RUBY LANGUAGE II Classes Mixin EnumerableAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 24. CLASSES & OBJECTS  Initializer and instance variables class Movie def initialize(name) @name = name end def play puts %Q{Playing “#{@name}”. Enjoy!} end end m = Movie.new(“Pulp fiction”) m.play => Playing “Pulp fiction”. Enjoy!Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 25. CLASSES & OBJECTS II  Attributes class Movie def initialize(name) @name = name end } def name # attr_reader :name @name end # attr_accessor :name def name=(value) # attr_writter :name @name = value end end m = Movie.new(Brazil).name = “Pulp fiction”Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 26. CODE ORGANIZATION  Code in files with .rb extension  Require movie will read movie.rb file and make its methods available to the current file  Require media/movie will read file from media dir relative to the current working dir $LOAD_PATH << media require movieAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 27. CODE ORGANIZATION II  Relative to this file: require File.join(File.dirname(__FILE__), media/movie)Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 28. MIXINS  What about module “instance methods”?  One of the greatest Ruby features!  You can define functions in Modules, and get them added to your classes.  Great code reuse,  Multiple inheritance alternative.  Code organizationAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 29. ENUMERABLE  Enumerable mixin, from the standard library documentation: The Enumerable mixin provides collection classes with several traversal and searching methods, and with the ability to sort. The class must provide a method each, which yields successive members of the collectionAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 30. ENUMERABLE II  It provides useful methods such as:  map  to_a  take_while  count  injectAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 31. EXAMPLES rSpec Enumerable Method Missing Sinatra BDD Cucumber DSLAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 32. RSPEC TESTING LIBRARY require java require rubygems java_import MovieLibrary java_import Movie describe MovieLibrary do it "should be created empty" do lib = MovieLibrary.new lib.contents.should be_empty end it "should add an element" do lib = MovieLibrary.new m = Movie.new Blazing Saddles lib.add m lib.contents.should include(m) lib.contents.count.should == 1 end endAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 33. ENUMERBLE MIXIN require rubygems java_import MovieLibrary java_import Movie class MovieLibrary include Enumerable def each(&block) contents.each(&block) end endAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 34. ENUMERBLE MIXIN lib = MovieLibrary.new lib.add(Movie.new "Blazing Saddles") lib.add(Movie.new "Spaceballs") lib.add(Movie.new "Young Frankenstein") lib.each { |m| puts "The movie is #{m.title}"} puts "nn**** Using Inject" lib.inject([]) { |a, m| a << m.title } .each { |s| puts "The movie is #{s}" } puts "nn*** Using find" lib.find_all { |m| m.title.end_with? s } .each { |m| puts "The movies that end with s: #{m.title}"}Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 35. EXTEND LIBRARY WITH METHOD MISSING require File.dirname(__FILE__) + "....bin/Debug/MavenThought.MovieLibrary.dll" require rubygems include MavenThought::MovieLibrary class Library def method_missing(m, *args) if m.id2name.include?("find_by") field = m.id2name.sub( /find_by_/, "") contents.find_all( lambda { |m| m.send(field) == args[0] } ) else super end end end lib = Library.new lib.add Movie.new( "Blazing Saddles", System::DateTime.new(1972, 1, 1)) lib.add Movie.new( "Spaceballs", System::DateTime.new(1987, 1, 1)) puts "Using find by title #{lib.find_by_title( "Blazing Saddles" )}"Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 36. SIMPLE WEB WITH SINATRA require rubygems require sinatra require haml require singleton java_import MovieLibrary java_import Movie class MovieLibrary include Singleton end # index get / do @movies = MovieLibrary.instance.contents haml :index end # create post / do m = Movie.new(params[:title]) MovieLibrary.instance.add m redirect / endAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 37. BDD WITH CUCUMBER Feature: Addition In order to make my library grow As a registered user I want to add movies to the library Scenario: Add a movie Given I have an empty library When I add the following movies: | title | release_date | | Blazing Saddles | Feb 7, 1974 | | Young Frankenstein | Dec 15, 1974 | | Spaceballs | Jun 24, 1987 | Then The library should have 3 movies And "Blazing Saddles" should be in the list with date "Feb 7, 1974" And "Young Frankenstein" should be in the list with date "Dec 15, 1974" And "Spaceballs" should be in the list with release date "Jun 24, 1987"Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 38. BDD WITH CUCUMBER require File.dirname(__FILE__) + "...MavenThought.MovieLibrary.dll" include MavenThought::MovieLibrary Given /^I have an empty library$/ do @lib = Library.new end When /^I add the following movies:$/ do |table| table.hashes.each do |row| movie = Movie.new row[:title], System::DateTime.parse(...) @lib.add movie end endAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 39. DSL I RAKE desc "Builds the project" task :build do call_target msbuild_cmd, :build end desc "Rebuild the application by cleaning and then building" task :rebuild => [:clean, :build] desc "Runs all the tests" task :test => ["test:all"]Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 40. DSL II CRON - WHENEVER every 10.minutes do runner "MyModel.some_process" rake "my:rake:task" command "/usr/bin/my_great_command" end every 2.days, :at => 4:30am do command "/usr/bin/my_great_command" endAmir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 41. QUESTIONS? (Don’t be shy)Monday, June 13, 2011
  • 42. CONTACT AND MATERIALS • Contact me: amir@barylko.com, @abarylko • Blog:http://www.orthocoders.com • Site:http://www.maventhought.com • Download: http://www.orthocoders.com/presentations.Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011
  • 43. ONLINE RESOURCES  IronRuby: http://ironruby.net/  Jruby: http://jruby.org  Ruby language site: http://www.ruby-lang.org  rSpec: http://rspec.info/  Sinatra: http://www.sinatrarb.com/  Cucumber: http://cukes.info/  Rake: http://rake.rubyforge.org/Amir Barylko - Jruby & Iron Ruby MavenThought Inc.Monday, June 13, 2011