Monkeybars in the Manor

Monkeybars in the manor

What do you think? about Java?

DIE, DIE DIE, DIE DIE, DIE DIE, DIE DIE, DIE DIE, DIE DIE, DIE DIE, DIE DIE, DIE DIE, DIE DIE, DIE DIE, DIE DIE, DIE

What do you think? About JRuby?

What do you think? About JRuby? (it’s not so bad really)

Before... JRuby Installed Netbeans Downloaded Gems

Twitter Client The Spec •Login •Report errors •Display friend tweets •Post tweets

Creating... the app

Initial Setup + scaffolding $> monkeybars projectname $> cd projectname $> rawr install (choose option 2) $> jruby -S rake generate ALL='src/login'

Install Gems and freeze Gems $> jruby -S gem install twitter $> cd lib/ruby $> jruby -S gem unpack twitter $> jruby -S gem unpack hpricot

Skeleton App will look something like this

Net Beans New Project 1. Import Existing Java project with sources 2. Add JRuby complete library 3. Add Swing.. Net Beans

Net Beans New Project 1. Import Existing Java project with sources 2. Add JRuby complete library 3. Add Swing.. LIVE DEMO! Net Beans

Under the hood Like Rails but not as you know it M VC

username.text View password.text login_button username Controller Model password

Sample Code a quick look controllers, models, views event handling

Controller class LoginController < ApplicationController set_model 'LoginModel' set_view 'LoginView' set_close_action :exit def login_button_action_performed model, view_transfer = view_state if @user = model.login(model.username, model.password) TweetController.instance.setup(model) TweetController.instance.open close else transfer[:errors] = model.errors signal(:login_failed) end end end

Model class LoginModel attr_accessor :username, :password, :message, :errors, :user def login(username, password) begin @user = Twitter::Base.new(username, password) @user.timeline self rescue Twitter::CantConnect => e @errors ||= [] @errors << $!.to_s return false end end end

View class LoginView < ApplicationView set_java_class 'login.LoginFrame' map :view => quot;username.textquot;, :model => :username map :view => quot;password.textquot;, :model => :password define_signal :name => :login_failed, :handler => :login_failed def login_failed(model, transfer) message.text = transfer[:errors].to_s end nom end nom..

The App pre alpha 0.333333333333

Result

Package For cross platform distro rawr install Text 2: Keep the current Rakeﬁle, and add the rawr content to the top. http://rawr.rubyforge.org/

Package Commands For cross platform distro Text Remember to edit your build_conﬁguration.yaml 1st

Package Sample Config for RAWR to generate app # Name of the created jar file project_name: tweetobix # Directory to create and place produced project files in output_dir: package ----------<SNIP>---------------- # Individual files that should be loaded on the classpath classpath_files: - lib/java/jruby-complete.jar - lib/java/swing-layout-1.0.3.jar see build_configuration.yaml

Tricks and tips

Why didn’t you use the twitter4r gem ?

jruby --command gem install twitter4r Building native extensions. This could take a while... mypath/jruby-1.1.4/lib/ruby/1.8/mkmf.rb:7: JRuby does not support native extensions. Check wiki.jruby.org for alternatives. (NotImplementedError) from mypath/jruby-1.1.4/lib/ruby/1.8/mkmf.rb:1:in `require' from extconf.rb:1 ERROR: Error installing twitter4r: ERROR: Failed to build gem native extension. mypath/jruby-1.1.4/bin/jruby extconf.rb install twitter4r Gem ﬁles will remain installed in /mypath/jruby-1.1.4/lib/ruby/ gems/1.8/gems/json-1.1.3 for inspection. Results logged to mypath/jruby-1.1.4/lib/ruby/gems/1.8/gems/ json-1.1.3/ext/json/ext/parser/gem_make.out

Requiring Gems Frozen require 'manifest' # Add vendored gems to load path and require them automatically Dir[File.expand_path(File.dirname(__FILE__) + quot;/../lib/ruby/**quot;)].map do |dir| lib = quot;#{dir}/libquot; lib = dir if lib =~ /.w+$/ #File.directory? is broken in current JRuby for dirs inside jars $: << lib gem_name = File.basename(dir.gsub(/-d+.d+.d+$/, '')) gem_path = dir + quot;/lib/quot; + gem_name + quot;.rbquot; begin require gem_path if File.exists? gem_path rescue p quot;could not load gem #{gem_path}quot; end end

Gotchas a few java.lang.NullPointerException: null build paths gems

-1’s The not so good bits • Assumes knowledge of Java • Quirky MVC • Learning curve • Early days...

+1’s The good bits • GUI Builder (using Netbeans) • Interface with mature Java libs • It’s all Ruby! • Cross platform distribution • No platform dependancy on Ruby • Cutting edge

Blinked? Go here http://tweetobix.com Steps plus code to download

Fin. martinbtt http://www.beyondthetype.com

Monkeybars in the Manor

by martinbtt on Nov 26, 2008

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