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@mattwynne GoRuCo, 23rd June 2012 Hexagonal Rails

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Caveat

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and then...

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Why?

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Connected

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Modular

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Modular, in the large

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What does it do?

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Web UI API Project Topic Publisher User Membership

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No, What does it do?

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Metaphor

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Librarian Bouncer Web UI Controllers API Project Topic Publisher User Membership

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Librarian Bouncer Web UI Controllers API Project Topic Publisher User Membership

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Modular, in the small

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Protocols

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Your domain model is not in your classes, it's in the communication patterns between the objects at runtime. — Steve Freeman & Nat Price

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Your domain model is not where you think it is

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Your domain model is in the protocols

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1989

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Responsibility- Driven Design

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http://www.flickr.com/photos/scania/2869194523/sizes/l/in/photostream/

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Designing Protocols

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Procedural code gets information then makes decisions. Object-oriented code tells objects to do things. — Alec Sharp, Smalltalk by Example Tell, don't ask

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Example: Passive Controller

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Organization Creator Controller User Organization User Interface

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Organization Creator Controller User Organization User Interface Feed Writer ActivityFeed

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WDYT?

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Pattern Wankery?

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Snake Oil?

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Java?

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Let's explore!

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References http://www.threeriversinstitute.org/blog/?p=338 http://www.growing-object-oriented-software.com/ http://pragprog.com/articles/tell-dont-ask http://alistair.cockburn.us/Hexagonal+architecture http://devblog.avdi.org/2012/03/15/now-available-objects-on-rails/ http://mattwynne.net/category/hexagonal-rails/ http://www.wirfs-brock.com/PDFs/How%20Designs%20Differ.pdf http://nccastaff.bournemouth.ac.uk/jmacey/CA1/Papers/Responsibility-Driven%20Design.pdf