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Why JRuby?
Fiona Tay
@msfionatay
Engineer, Pivotal Labs
This is for the
person who just
wants to make web
apps.
This is about the
Good, The Bad, and
The Ugly.
I’m a Rubyist




                4
I’m also a JRubyist




http://github.com/GreenplumChorus/chorus



                                           5
An Introduction
It’s a Ruby implementation
1. Install it
2. Write Ruby code




                             7
It’s a Ruby implementation




                             8
Ruby implementations
Interchangeable to an extent
Popular implementations:
• MRI
• JRuby
• Rubinius
• MacRuby




                               9
Under the hood




                       




                 10
Under the hood




                                  




                 secret sauce

                            11
Interchangeability
1+1 should be 2 in all implementations




                                         12
Implementation differences
Some implementations are more equal than others
Differences:
• Speed of execution
• Support for libraries
• Implementation bugs




                                                  13
History of JRuby
Around since 2002
Has had traction in real projects since ~2005




                                                14
JRuby in the real world




                          15
JRuby in the real world




                          16
The Good
Access to Java libraries
Incredibly powerful tool
Everyone and his/her dog writes Java




                                       18
Java libraries: NLP
Stanford Parser is the NLP library of choice




                                               19
Java libraries: Email
JavaMail is a better alternative to ActionMailer




                                                   20
Access to Java libraries
JRuby has deep integration with Java
Directly call Java code from Ruby




                                       21
Directly calling Java code




                             22
Using other languages
Other languages built on the JVM
• Scala - special support
• Clojure
• Groovy




                                   23
Using Ruby gems
If you’re lucky, someone has made a Ruby gem that
wraps the Java library
Also wrapping a gem is a good idea




                                                    24
Easier app deployment
Not easier than git push heroku master
Only relevant if you’re deploying to large server system




                                                           25
Easier app deployment
Leverage existing Java-based deployment infrastructure




                                                         26
Leverage infrastructure
Warbler packages everything into a single WAR file
Standard file format for Java deploys




                                                    27
Other deployment options
TorqueBox provides additional services




                                         28
Better performance
Better compiler than MRI
Benefits from improvements to JVM




                                   29
Better performance
Access to highly optimized Java libraries




                                            30
The Bad
Gem availability




                   32
Gem availability
Gems written in pure Ruby work with JRuby
Gems with C extensions don’t work with JRuby
Typically, these are older, less-maintained gems




                                                   33
Fixing gems
Sometimes, you can fix the existing gem
Could be as simple as replacing its dependencies
Or could be complex




                                                   34
Fixing gems
Patched a job queueing system
Took more work than we expected
YMMV




                                  35
Long app startup time
Inhibits test-driven development
Due to Rails startup time
Difficult to set up Spork with JRuby




                                       36
Long app startup time
C’est la vie




                        37
Less mature technology
MRI still the default
Though JRuby has matured
Libraries developed against MRI




                                  38
The Ugly
Concurrency
“Concurrency is when several computations are
executing simultaneously, and potentially interacting
with each other.” - Wikipedia




                                                        40
Concurrency
JRuby has real threads
MRI Ruby has threads with Global Interpreter Lock




                                                    41
Concurrency and Ruby
Threads are a major innovation
But MRI has never really had a focus on concurrency




                                                      42
Concurrency is great
Cheaper to scale
Good multi-threaded web servers




                                  43
More bang for your buck
One server: MRI runs two Ruby processes
One server: JRuby runs two Ruby processes with 4
threads each
Can use JRuby on Heroku




                                                   44
Concurrency is not free
Bugs in non-thread safe libraries
• Rails
• Airbrake
Libraries developed without a focus on concurrency




                                                     45
Concurrency is not free
Writing thread-safe code is difficult
Even for Java developers with experience
But concurrency is the new sexy




                                           46
Concurrency is worth it
Huge performance improvements
Some features would be much easier with threads
Threads is the future




                                                  47
The Decision
JRuby is a non-
standard choice.
Should you use JRuby?
Do you want to use Java libraries?




                                     50
Should you use JRuby?
Do you want to leverage Java-based deployment
infrastructure?




                                                51
Should you use JRuby?
Do you need good performance?




                                52
Should you use JRuby?
Otherwise, no




                        53
Should you use JRuby?
Not to worry - you can always switch to JRuby later
Lots of people switch for performance reasons




                                                      54
Getting started with JRuby
jruby-lint checks how ready your code is to run on
JRuby




                                                     55
Acknowledgments
Pivotal Labs
JRuby team




                  56
Thanks!
@MsFionaTay

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Why JRuby?