Rubyists Dream of Eclectic Java

Rubyists Dream of Eclectic Java Leveraging Enterprise Java for Ruby fu Vishnu Gopal www.vish.in

Me • Born and brought up a Keralite. Mallu. • Worked in the Mobile VAS sector • Founded Torque: www.torque.co.in • Uzanto & SlideShare: www.slideshare.net • Me: www.vish.in

Ruby • New kid on the block (?) • Dynamic programming, meta-programming • Less is more, succinct code • Riding the Rails wave • Ruby (MRI) is Slow(er)

Java • Most popular programming language • Rich toolset, GUI tools, editors, RAD IDEs • Enterprise support and adoption • Community and Libraries • Java is OpenSource • Cumbersome, heavy language, strict typing

JVM • A tried and true Virtual Machine • JSR 223: Scripting for the Java Platform • Java 6 increased performance! • SUN

Java + Ruby • JVM is cool, Java has tools • Ruby brings elegance • Any solution must: • Preserve Ruby’s ability to reﬂect on itself • Not sacriﬁce Java performance and toolset • Be an elegant bridge

Java + Ruby = JRuby • Ruby interpreter written in 100% Java • Walks, talks and quacks like Ruby • Almost all of the Ruby Standard Library has been ported • Even runs Rails! (with warnings)

Interlude One JRuby v/s Ruby

Rails on JRuby • You can use Camping/JRuby well • Ruby hype is mostly Rails • JRuby running Rails is a huge milestone • Not there yet, but good progress • Simple web applications run well • SQLite adapter isn’t supported

SlideShare on JRuby • Complicated app • 90K+ of Ruby Code • Plugins, homegrown extensions • Memcached libraries, fragment caching, backgroundrb • Ported over in 3 hours of work • Around 40% functionally complete

Interlude Two SlideShare on JRuby

Slideshare/JRuby Workarounds • script/console (in dev mode) worked without a hitch • script/server had problems • Resolved by: • removed @@instance variables • removed ﬂash notices • removed OutputCompression plugin

Future • JVM is cool, Java toolset scene is cooler • Netbeans/Ruby/tools integration • Dynamically add in Java modules to Rails applications • Glassﬁsh and autodeploy as WARs • Get Rails adoption into the enterprise

Finis Questions? www.slideshare.net/vishnu

Alternatives to JRuby • Scripting Language: • JPython • Grails & Groovy • Other Java cool stuff: • Google Web Toolkit

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Rubyists Dream of Eclectic Java

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