JRuby - Programmer's Best Friend on JVM
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This document discusses Ruby, an object-oriented scripting language, and its integration with Java via JRuby. It provides an overview of Ruby concepts like classes, modules, and metaprogramming. It then discusses how JRuby allows embedding Ruby as a scripting language in Java applications and using Java classes from Ruby. It also covers Ruby on Rails and how JRuby can be used to deploy Rails applications on the JVM. Finally, it discusses performance improvements in JRuby 1.7 and some benefits of using JRuby.
![ActionController
class PostsController < ApplicationController
# GET /posts
def index
@posts = Post.all
end
# GET /posts/1
def show
@post = Post.find(params[:id])
end
# GET /posts/new
def new
@post = Post.new
end
# ...
end](https://image.slidesharecdn.com/jruby-programmersbestfriendonjvm-121129154224-phpapp01/85/JRuby-Programmer-s-Best-Friend-on-JVM-28-320.jpg)
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JRuby - Programmer's Best Friend on JVM
- 1. Programmer’s Best Friend on JVM Raimonds Simanovskis
- 2. @rsim github.com/rsim Raimonds Simanovskis
- 3. The easiest Business Intelligence tool on the Web
- 5. object-oriented dynamic programming language simple from outside Yukihiro Matsumoto or “Matz” powerful inside
- 6. Classes
- 8. Constructor
- 11. Last expression is always return value
- 12. .new is just a class method
- 13. Blocks / Closures Anonymous function as argument
- 14. Modules
- 15. Metaprogramming
- 18. Integration with Java Embed JRuby as scripting engine Use Java classes from JRuby
- 19. Embed JRuby
- 20. Embed JRuby
- 21. Use Java classes from JRuby Demo
- 22. Build with Rake
- 23. Test with Test::Unit or RSpec
- 24. Test with Test::Unit or RSpec
- 25. Ruby on Rails Web applications development framework Model View Controller (MVC) architecture Convention over Configuration Don’t Repeat Yourself (DRY) Focused on developer productivity Agile software development approach
- 26. MVC Architecture Request Router Database SQL Browser Response Action Active Controller Record Action View
- 27. ActiveRecord (Model) class CreatePosts < ActiveRecor::Migration def self.up create_table :posts do |t| CREATE TABLE posts ( t.string :title id NUMBER(38) NOT t.text :body NULL, t.timestamps title VARCHAR2(255), end body CLOB, end created_at DATE, end updated_at DATE ); CREATE SEQUENCE posts_seq; class Post < ActiveRecord::Base # nothing here! end post = Post.new post.title = "First post" post.save post = Post.find(1) puts post.name # output: "First post"
- 28. ActionController class PostsController < ApplicationController # GET /posts def index @posts = Post.all end # GET /posts/1 def show @post = Post.find(params[:id]) end # GET /posts/new def new @post = Post.new end # ... end
- 29. ActionView <h1>Posts</h1> <% @posts.each do |post| %> <h2><%= post.title %></h2> <h3>Created at <%= post.created_at %></h3> <p><%= post.body %></p> <% end %>
- 30. JRuby deployment <insert app server here> Java app sever Application WAR file Application JRuby Gems warbler source Application
- 31. JRuby deployment Web Server Trinidad JRuby Apache Tomcat Gems Application deploy Application source
- 32. JRuby deployment
- 33. eazyBI case study .com Ruby on Rails Jetty JRuby application deploy Application Gems Mondrian OLAP engine Apache Batik SVG toolkit pac Private kag e package Packaged application plugin OSGi bundle Application Gems JRuby jruby-rack *.jar Application Gems SQL Server
- 34. JRuby 1.7 and Java 7 invokedynamic
- 40. JRuby performance improvements JRuby/Java 6 JRuby/Java 7 Times Faster than Ruby 1.9.3 5 4.226 4.32 3.75 3.66 3.44 2.5 2.658 1.914 1.806 1.538 1.565 1.25 1.346 0 base64 richards neural mandelbrot redblack
- 41. JRuby Benefits Easy to learn for Java programmers Easy to mix Ruby and Java Useful frameworks and libraries Higher productivity for many tasks Ruby community