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JRuby talk / 26.03.2014 / @vbalazs


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My talk about what is jruby, how it works and why i find it very interesting.
Also it's about how you can try it today, what are the main advantages of using it and what difficulties you can face

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JRuby talk / 26.03.2014 / @vbalazs

  1. 1. WHAT IS JRUBY? ... AND WHY I LIKE IT :) /BalazsVarga @vbalazs
  2. 2. "JRuby is a100% Javaimplementation of the Ruby programming language. Itis Ruby for the JVM."
  3. 3. MIXED MODE ENGINE Interpreter + JRubyJIT AOT-compiled to Javabytecode JIT:JustInTimecompile AOT:Ahead-of-timecompile
  4. 4. JIT ALL THE THINGS (J.A.T.T ©) JIT:JustInTimecompiler
  5. 5. HOW CAN I USE IT? rvm installjruby rbenvinstalljruby-X.Y.Z $ruby-v jruby1.7.11(1.9.3p392)2014-02-2486339bbon JavaHotSpot(TM)64-BitServerVM1.8.0-b132+indy[darwin-x86_64] $ruby-e"puts'hello'" hello
  6. 6. HOW ABOUT WEBAPPS? Embedded servers mostlybased on Jetty, Tomcat, JBoss and Vertx (ex.: Puma, Trinidad, TourqueBox) run with the server from the project package in ajavaarchive (jar) and execute as ajavaapp Standard javaservers like Jetty, Tomcat, JBoss, GlassFish, WebLogic Phusion Passenger (>=4.0) :) Differentfeatures and performance butyou can easilyswitch between them.
  7. 7. PERFORMANCE JRuby: interpreted or AOTmode JVM: clientor server mode JIT:JustInTimecompiler AOT:Ahead-of-timecompiler
  9. 9. THREADS & CONCURRENCY Rubythread == Javathread == native thread No GIL Runtime is threadsafe (exceptsome core classes)
  10. 10. STARTUP TIME Performance trade-off
  11. 11. DEBUGGING Itworks :)
  12. 12. C EXTENSIONS, INCOMPATIBILITIES cannotrun native C extensions ActiveRecord-JDBC adapter (extension) FFI ftw FFI:Foreignfunctioninterface
  13. 13. FUTURE - TRUFFLE experimentalimplementation usingGraaland Truffle Graalis anew implementation of aJITcompiler in the OpenJDK JVM expose VM functionalityviaJavaAPIs Truffle: AST(AbstractSyntax Tree) interpretingframework SimonyiConference 2014 15 April2014
  14. 14. FUTURE DEVELOPMENT Sponsors over the years: Sun Microsystems ThoughtWorks Engine Yard RedHat(from 2012)
  15. 15. SUMMARY Disadvantages Slowlyfollows the Rubylang. Incompatibilitywith C exts Fewer developer Advantages Integration with Java Performance Brightfuture
  16. 16. QUESTIONS?