JRuby - The Perfect Alternative
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JRuby allows Ruby code to run on the Java Virtual Machine. It provides the ability to reuse existing Java libraries and deploy Ruby applications in scalable and enterprise-ready environments. While Java may have a reputation for being slow, JRuby performance is on par with CRuby for most web applications due to JIT compilation optimizations in the JVM. Calling between Ruby and Java code is seamless, allowing Ruby code to leverage Java libraries and Java code to leverage Ruby code. JRuby applications can be packaged and deployed like standard Java applications.
![Ruby > Java & Back
[SNIPPED]](https://image.slidesharecdn.com/jruby-100512040250-phpapp01/85/JRuby-The-Perfect-Alternative-31-320.jpg)
JRuby - The Perfect Alternative
- 1. Ram Vijapurapu @rvijapurapu
- 2. What is JRuby? Its just Ruby Running on the JVM (Java Virtual Machine)
- 3. Conclusion ..I truly wish it is that simple. Image credit: http://www.flickr.com/photos/hordurk/3204191929/
- 7. Why do we want to go back to the Haunted House again? ● Reuse what's already built Enterprise Ready ● Need of a Scalable Platform ^ ● Need for an inclusive Platform – Ruby, Groovy, Python, JS, .. ● Generally Love of Engineering Genius
- 8. What is the first thing you hear about Java? Image credit: http://bit.ly/btxcPf
- 9. Common Man! Java is Slooow ● Maybe... Maybe not! ACHTUNG! Highly Unscientific Testing
- 10. Common Man! Java is Slooow No Optimizations
- 11. Common Man! Java is Slooow 100
- 12. Common Man! Java is Slooow 1,000
- 13. Common Man! Java is Slooow 10,000
- 14. Common Man! Java is Slooow 100,000
- 15. Common Man! Java is Slooow 100,000 What's your Point? See Java is sl0000w!
- 16. st a Common Man! Java is Slooow F 1,000,000
- 17. st F a Common Man! Java is Slooow Fast 1,000,000 Clearly you fudged it!
- 18. You fudged it! ● Maybe – but there is method in madness
- 19. You fudged it! Moral: Focus on your code ● Maybe JVM there is care ofin madness & – but takes method the rest – well into the future Performance Improvements in JVM from 1.5 to 1.6 have been significant. both are running i386
- 20. What just happened? ● Magic – JVM/Hotspot (Dark Magic?) ● JIT (Just In Time Compilation) – Optimization on the Fly ● Speaking further on this is beyond the scope of this presentation _ Summary: Normal usage on Web you will find JRuby performs same as CRuby
- 21. As all good things in life........ there are few limitations ● You cannot use libraries which use CRuby Extensions ● Java Threads ● Posix Methods ● Does not support continuations/bindings. (Feature Missing) http://docs.codehaus.org/display/JRUBY/Limitations
- 22. Same stuff – Different Different ● ruby ● jruby ● Irb ● jirb ● rake ● jruby -S rake ● gem ● jruby -S gem Include jruby-complete.jar or jruby.jar in your CLASSPATH & PATH for the executable
- 23. Show me stuff... JRuby integration with JVM Ruby'ized – by popular demand!
- 24. Choose your Hammer – Calling Ruby from within Java
- 25. Choose your Hammer – Calling Ruby from within Java JSR 223
- 26. Choose your Hammer – Calling Ruby & Groovy from within Java
- 27. Choose your Hammer – Calling Ruby & Groovy from within Java Why would we want to do this? Because we can
- 28. Choose your Hammer – Calling JRuby file from within Java
- 29. Choose your Hammer – Calling JRuby file from within Java
- 30. Ruby > Java
- 31. Ruby > Java & Back [SNIPPED]
- 32. Ruby > Java & Back
- 33. Performance & External Libraries ● For the sake of performance it would be better to use Java Libraries over JRuby at times. ● Totally depends on your requirement. ● Including external Java libraries within your JRuby Code is fairly straightforward ● You can also put the jar files in the rails lib directory for getting access to them in your rails application
- 34. JfreeChart – Chart Generation ● All you need to do is either have the jars in your classpath ● Or include it in your libs folder in rails. http://kfahlgren.com/blog/2007/04/13/jruby-jfreechart-sparklines/
- 35. JRuby & Library Jars
- 36. This guy is boring why doesn't he just show me rails
- 37. The Holy Blog
- 38. ...
- 39. ...
- 40. DB Stuff
- 41. Packaging...
- 42. Packaging & Deploying config/warble.rb
- 43. Voila
- 44. In Summary ● I strongly believe JVM should be your platform Strategy ● This more or less comes out of my experience. ● JRuby will fit into many cloud architectures with little effort (Not sure of Azure yet) – Portability from within
- 45. Useful Links ● http://jruby.org/ ● http://www.infoq.com/vendorcontent/show.action?vc ● http://code.google.com/p/appengine-jruby/ > http://rails-depot.appspot.com/ ● http://en.wikipedia.org/wiki/JRuby#Performance
- 46. Ram Vijapurapu @rvijapurapu thinkbelievedo.com