maglev-a different way to develop with ruby

agile software development & services

MaglevRubyConf Argentina 2012

Hernán WilkinsonTwitter: @HernanWilkinson

Blog: objectmodels.blogspot.comwww.10pines.com

What is the presentation about

Common WebApp Architecture

Common WebApp Architecture

Issues

Code vs. DataObject vs. Data

Issues

Paradigm Mismatch(Need a translator)

Issues

Design Errors

• Forced by the ORM• Thinking in tables not in objects• Difficult to create test objects – Mock

abuse!• etc

Issues

More time to run!

• Tests run slow!• Starting can take minutes due to

ActiveRecord!

Therefore…

More “Human” TimeBigger Development Cost

Imagine…

Imagine…

Maglev

A…– Transactional– Automatically persisted– Multi-VM – NO RAM restricted

… Object Server

Maglev

• Two Modes:– Transient mode (normal ruby)– Persistent mode – The really interesting one!• Objects are naturally persistent• On Commit, saves transitive closure from a root

object• Transactional memory! (no deadlocks)

Example!

• Investment Accounts – Balance:

• 10 pesos + 5 dollars• 3000 bodens2012 + 600 futureDollarJan2013

• Portfolios– Account composite

• Multiple Web Interface– Sinatra (simple )– Rails

• Using TDD!

Goals

1. No Object-To-RDB Mapping– No Portfolio < ActiveRecord– No id

2. No SQL SELECT…3. No save! or update!4. Separation of concern – No transactional code mixed with model code

5. No Model to Web Framework coupling6. Only Objects!7. Development using TDD

Fulfilling Goals…

• No Object-To-RDB Mapping– No Portfolio < ActiveRecord– No id

• No SQL SELECT

Account Hierarchy

AccountTransaction Hierarchy

Measure Hierarchy

Fulfilling Goals…

• No Model to Web Framework coupling

PortfolioSystem and PortfolioSinatraApplication

Fulfilling Goals…

• No save! or update!• Separation of concern – No transactional code mixed with model

code

Showing the home page

Adding an Account

FREEDOM!!!

Conclusions

• Just Objects!• No ORM! No SQL! No ActiveRecord! • Tests run fast• Developed really fast• No need for mocks! – Bye bye FactoryGirl!• We did not have to worry about– Persistence– Transaccionability– Solved in one place

Conclusions

SimplerEasier

Cheaper…

Happier

Maglev

• Install with: rvm install maglev• Ruby 1.8.7• Rails: – No scaffolding when using just objects– Need to write generators

• Heroku??• Licence– Ruby code open source– VM is not open source

Futurology

Relational Databases will fall in less than 10 years

• Diseño Avanzado de Softaware con Objetos I: 29 de Octubre

• Metaprogramación con Lenguajes de Objetos: 13 de Noviembre

• TDD: 19 de Noviembre

• Diseño Avanzado de Softaware con Objetos II: 4 de Diciembre

(50% de descuento si vinieron a esta conferencia!)http://www.10pines.com/content/cursos-disponibles

Smalltalks 2012

Questions?

agile software development & services

Muchas gracias!

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twitter: @10Pines

Argentina

Tel.: +54 (11) 6091-3125Alem 693, 5BBuenos Aires