JRuby on Appengine
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A meetup talk given at budapest.rb http://www.meetup.com/budapest-rb/

A meetup talk given at budapest.rb http://www.meetup.com/budapest-rb/

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    JRuby on Appengine JRuby on Appengine Presentation Transcript

    • budapest.rb JRuby on AppEngine Janos Hardi janos@liligo.com
    • Agenda JVM Scripting on the JVM JRuby Rack Google AppEngine/Java Experiences
    • JVM Java Language != Java Platform Platform Independence Rich Class System Open Source
    • JVM App App App JVM JVM JVM Java Runtime Environment
    • JVM http://www.artima.com/insidejvm/ed2/jvm2.html
    • JVM Fine tuneability Extensibility Stable Admin interfaces Safe code sharing
    • Scripting on the JVM Python (Jython - http://www.jython.org) Ruby (JRuby - http://www.jruby.org) Lisp (Clojure - http://clojure.org) JavaScript (Rhino - http://www.mozilla.org/rhino/) PHP (IBM - P8 / Caucho - Quercus) Scala (http://www.scala-lang.org) And many many more
    • Scripting on the JVM How?
    • Scripting on the JVM JSR-223 import javax.script.* http://scripting.dev.java.net/ http://developers.sun.com/scripting/
    • Scripting on the JVM App JRuby Scripting JVM Java Runtime Environment
    • Scripting on the JVM Why?
    • Scripting on the JVM Rapid app development Special needs, eg. at liligo.com ;) Integration
    • JRuby Ruby for Java Ruby in Java
    • JRuby Native Threads Garbage Collector Embeddability No fork No C extensions
    • Rack Rails, Merb, Sinatra, Camping, Ramaze ... CGI, FCGI, Mongrel, Thin, Webrick, Litespeed ...
    • Rack class HelloWorld def call(env) [200, {"Content-Type" => "text/plain"}, ["Hello world!"]] end end
    • Rack Simple Ruby API modelling HTTP Standard interface between frameworks and handlers Interface for injecting middlewares
    • Rack WSGI for Ruby http://chneukirchen.org/talks/#introducingrack http://wiki.github.com/rack/rack
    • JRuby-Rack WSGI for JRuby Rack + Java Servlet Containers Tomcat, Glassfish, Jetty ...
    • <context-param> <param-name>rackup</param-name> <param-value> require 'rubygems' require 'app' set :environment, :production set :run, false run Sinatra::Application </param-value> </context-param> <filter> <filter-name>RackFilter</filter-name> <filter-class>org.jruby.rack.RackFilter</filter-class> </filter> <filter-mapping> <filter-name>RackFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <listener> <listener-class> org.jruby.rack.RackServletContextListener </listener-class> </listener>
    • <web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5"> <context-param> <param-name>public.root</param-name> <param-value>/</param-value> </context-param> <filter> <filter-name>RackFilter</filter-name> <filter-class> org.jruby.rack.RackFilter </filter-class> </filter> <filter-mapping> <filter-name>RackFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <listener> <listener-class> org.jruby.rack.merb.MerbServletContextListener </listener-class> </listener> </web-app>
    • JRuby-Rack Framework R JRuby a c App k Servlet container JVM Java Runtime Environment
    • Google AppEngine/Java What?
    • Google AppEngine/Java App stack App hosting Development environment Great API system A bunch of services for free ...
    • GAE/J – App stack Automatic scaling Write your App only Everything else happens on APIs External APIs with URL Fetch
    • GAE/J – App hosting 10 app / google user Admin interface Cron Quota is OK Logging
    • GAE/J – App hosting
    • GAE/J – App hosting
    • GAE/J – App hosting
    • GAE/J – Dev environment App server Deployment App versions Multiple developer accounts Good examples SDK Plugins (Eclipse IDE)
    • GAE/J – APIs / Services Memcache Datastore Mail Image Google account URL Fetch
    • GAE/J - Datastore Schemaless Object oriented Key / Value Universal < Entity ( Story (1) ) >
    • Experiences Slow warmup (JRuby + AppEngine) Nice performance after App cache CPU intensive operations Almost unusable Dev tools Rare libs for GAE/J APIs No migration (bulk loader is 404!)
    • Experiences JRuby-AppEngine (low level wrapper for almost all APIs) Bumble (minimal lib for the Datastore) Datamapper (with JRuby-AppEngine) Warbler (for deployment)
    • JRuby-AppEngine post '/story/add' do @story = Datastore::Entity.new('Story') @story['title'] = params[:title] @story['slug'] = params[:slug] @story['body'] = Datastore::Text.new( params[:body] ) Datastore.put(@story) redirect '/stories' end
    • Bumble class Person include Bumble ds :given_name, :sur_name, :email has_many :blogs, Blog, :owner_id end class Blog include Bumble ds :name, :owner_id, :created_at belongs_to :owner, Person has_many :posts, :Post, :blog_id, :iorder => :created_at end class Post include Bumble ds :title, :content, :created_at, :blog_id belongs_to :blog, Blog end
    • Warbler Warbler::Config.new do |config| config.dirs = %w(lib views models) config.includes = FileList["appengine-web.xml", "app.rb", "config.ru"] config.gems = ['sinatra', 'haml','appengine- apis','maruku'] config.gem_dependencies = true config.war_name = "test" config.webxml.booter = :rack config.webxml.jruby.min.runtimes = 1 config.webxml.jruby.max.runtimes = 1 config.webxml.jruby.init.serial = true config.java_libs = [] end
    • Components Appengine account GAE/J SDK JRuby 1.3.1 JRuby-Rack Gems GAE/Merb Example Application ;) http://github.com/yaanno/gae-merb-example
    • Merb flat app WEB-INF appengine-web.xml web.xml application.rb config framework.rb init.rb lib appengine-api-sdk.jar gems.jar jruby-complete.jar jruby-rack.jar views index.haml
    • Thanks
    • A few useful links http://www.infoq.com/presentations/nicholson-php-jvm http://www.artima.com/insidejvm/ed2/index.html http://code.google.com/appengine/ http://blog.headius.com http://blog.nicksieger.com http://olabini.com/blog/ http://isitjruby.com/ http://code.google.com/events/io/sessions.html#appengine