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JRUBY ON RAILSONGOOGLE APP ENGINE

marted 13 luglio 2010

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WHO WE ARE

Rivello Vincenzo

Email: [email protected]: enzoriv

Alessandro De Simone

Email: [email protected]

Twitter: alexdesi

Software Engineer & Developer

Software Engineer & Developer

mailto:[email protected]:[email protected]

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INDEX

JRuby on Rails on Google App Engine

Introduction to Ruby/JRuby

Introduction to Ruby on Rails

JRoR on GAE - Pro/Against

Short Live Example

Conclusions


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JRUBY ON GOOGLE APPENGINE

With the newly support for Java, is now possible toexecute Ruby code on Google app Engine.

This thanks to a project that has the sole purpose to

simplify the use of JRuby for development on GAE(like actually happen for Java and Python)


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WHY USE RUBY ON GAE?

Because maybe you already know Ruby

Because Ruby is powerful and flexible, engineeredmore for persons rather than computers

Because it permits to use Ruby on Rails! (v 2.3.5and , shortly, 3.0 fully)


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RUBY/JRUBY


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WHAT IS RUBY

Created in 1993 by Yukihiro Matz Matsumoto

General purpose scripting language

Completely Object Oriented

Inspired by Smalltalk , Lisp and Perl

Actually at the version 1.8.7(stable), and 1.9.1(with abackward incompatibility)

With a young and creative community!


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WHAT IS JRUBY

Created by J.A. Petersen in 2001

JRuby is a Java implementation of the Ruby

programming language

Permits the union of Rubys elegance and JavasEcosystem

Stable and Production Ready (version 1.5.1)

Actually is the faster Ruby implementation(between200% to 500% more faster)


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EXAMPLE RUBY/JAVA

Language war has no sense.

Ruby is concise, readable and flexible

Java have great performance

JRuby permits to Ruby and Java to share a commonplace, and unite for greater good!


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RUBY FOR JAVA DEVELOPERS

Ruby is interpreted

>ruby my_program.rb

Java is compiled>javac MyProgram.java

>java MyProgram


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DYNAMIC TYPING USE

Variable doesnt have an associated type

You dont need to declare themIt is suffice to assign them:a = [1,2,3]instead of

int[] a = {1,2,3};


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RUBY IS CONCISE

Empty Program

RubyJava


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RUBY IS CONCISE

Java

Ruby


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RUBY FRAMEWORKS

Is possible to write ruby code and execute it withJRuby, and this permits us to create application on

GAE.

BUT, if we want to write a good web app in a shorttime, we have to use a framework:

Ruby on Rails

Merb

Sinatra


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RUBY ON RAILS


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RUBY ON RAILS

RoR is an open-source framework , optimized for the

programmers happiness, and to make web developinga fun and sustainable experienceWith RoR you can program in a more immediate way,thanks also to the Convention Over Configuration

paradigm.


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RUBY ON RAILS

Created by David Heinemeier Hesson (at 37 Signals)

Fully compliant on Agile Development standards

Complete development solution (from prototyping totesting)

Favors communication inside the team(or betweenteams)

Lots and lots of plugins for faster development


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PHILOSOPHY

Less and more readable code

No compilation cycle

Convention Over Configuration (almost no configuration file, predefineddirectory structure)

Best practices: MVC, DRY(partial, helper, ...), Testing

Almost everything is Ruby(or Rails DSL) Code (Activerecord for SQL andprototype for JavaScript)

Very active community, and great documentation (also video).


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JRUBY ON GAE

Project created by John Woodell and mantained byJRuby community

Exploits Gaes compatibility with Java to bring rubyweb development frameworks on GAE

Very simple setup.

Rething application on a key/value philosophy, insteadof relational.


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JRUBY ON GAE - PRO

Free Rails Hosting(and highly scalable)

Full integration with Javas whitelist classes (on GAE)

Integration with Google services ecosystem


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JRUBY SU GAE - PRO 2

Great exercise to take confidence wit NoSqldatabases

Thats because Bigtable is a Key/Value database,

similar to Redis or MongoDB, but more powerful.


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JRUBY ON GAE - AGAINST

Very HIGH instance creation time (10-15 seconds)

A little bit difficult at the beginning: you have toaccept the Cloud Hosting and decentralized

resources concept.


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LIVE EXAMPLE


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CONCLUSIONS

For us Rails developers, GAE is far-to-be a perfectand stable solution for our hosting problems

But without any doubt, is something that we can

count on, expecially if you want to experience JRubysworld, and its interaction with Rails and GAE.


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RESOURCES ANDINFORMATIONS

Tutorial live:

http://jror-example.appspot.com

Source code:

http://github.com/enzor

More informations:

http://rails-primer.appspot.com/

http://rails-primer.appspot.com/http://rails-primer.appspot.com/http://github.com/enzorhttp://jror-example.appspot.com/http://rails-primer.appspot.com/http://rails-primer.appspot.com/http://github.com/enzorhttp://github.com/enzorhttp://jror-example.appspot.com/http://jror-example.appspot.com/

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WE THANKS

Documents

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