Thinking Small

Thinking SmallBig things, small packages, yadda yaddaBen Scoﬁeld / @bscoﬁeldRubyNation / 2 April 2011

Specialization

Resource Usage

Big vs. Small

Hey, That’s me!

THIS VPS rockS!

MONOLITHADMIN SEARCH PAYMENTS API PUBLIC DATAREPORTS HELP CACHING

MONOLITH ADMIN SEARCH PAYMENTS API PUBLIC DATA REPORTS HELP CACHINGTWITTER

Like, WHOA

ADMIN SEARCH PAYMENTS API PUBLIC DATAREPORTS HELP CACHING

Hmmmm.

M1ADMIN APIREPORTS

M1ADMIN APIREPORTS Ow, Quit It!

Ow, Quit It! M1 M2ADMIN SEARCH API PUBLICREPORTS HELP Ow, Quit It!

Ow, Quit It! M1 M2 M3ADMIN SEARCH PAYMENTS API PUBLIC DATAREPORTS HELP CACHING Ow, Quit It! Ow, Quit It!

Shared Hosting, AIYEEEE!

Lame! Anyother reasonS?

Bye now!

Smaller Is Better

(bear with me)

Classes

Small classes are easier to:designbuildtestdebugreplacereuseunderstand

SOLIDSingle Responsibility Principle

SOLID Interface Segregation Principle

Demeter Principle

Applications

Small apps are easier to:designbuildtestdebugscalereplacereusepurchase

Design

Mockable

Build == Start

Ship It!

Baby Steps

Easy to Start,Easy to Finish,Motivating

red red green refactor

red green refactor

ASIDE:

$ rake test.........F............$ rake test......................

MONOLITHADMIN SEARCH PAYMENTS API PUBLIC DATA APIREPORTS HELP CACHING

red green refactor

MONOLITHADMIN SEARCH PAYMENTS API PUBLIC DATA APIREPORTS HELP CACHING

MONOLITH M1ADMIN SEARCH PAYMENTS DATA API PUBLICREPORTS HELP CACHING

MONOLITH M1ADMIN SEARCH PAYMENTS DATA API PUBLIC Ow, Quit It!REPORTS HELP CACHING

ADMIN SEARCH PAYMENTS DATA DATA DATA DATA API PUBLIC DATA DATAREPORTS HELP CACHING

BL AT AN T PL UG$ heroku addons:upgrade shared-database:20gb

or, you know, sharding and stuff

Replace

Hey, my search sucks.

Should I write this in ?

Purchase

Thanks for bearing with me:

But I’m already doing that!

How distinct are your functions?

Tests never lie

Code changes never lie

How do we do it?

You’re already doing it!

Caching

Payments

Search

Databases

The Past

Integration Tests

Isolate

Hey, my search sucks.

SEARCH

# in the applicationArticle.where([title LIKE ?, q])Article.where([tag_list LIKE ? OR title LIKE ?, q, q])# ...

# in the applicationArticle.search(q)Article.search(query, :include => [:tags])# article.rbclass Article < ActiveRecord::Base def self.search(query, options = {}) if options.empty? where([title LIKE ?, query]) else # ... end endend

Integration Tests: pass

Replace

# Gemfilegem texticle# article.rbclass Article < ActiveRecord::Base index title do title end index full do title tag_list end def self.search(query, options = {}) if options.empty? search_title(query) else # ... end endend

Integration Tests: pass

SEARCH MONOLITHADMIN PAYMENTS API PUBLIC DATAREPORTS HELP CACHING

Repeat!

THE FUTURE

Integration Tests

Plan for Modularity

Look for Opportunities

UG PL T AN ATBL

API-Driven Design

HTTP and REST

Discoverability

ADMIN updates schemaPUT / POST / DELETE what is editable? DATA

SEARCH metadata / data what should we index? DATA

queryPUBLIC SEARCH results metadata / data what should we index? DATA

Mountable Apps

Think Small

Smaller Is Worse?

M1ADMIN APIREPORTS

M1ADMIN APIREPORTS Ow! ... Hey, that wasn’t so bad

Latency

Reliability

Ben Scofield / @bscofieldhttp://spkr8.com/t/7028http://benscofield.com

THANKS! Ben Scofield / @bscofield http://spkr8.com/t/7028 http://benscofield.com

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Thinking Small

by Ben Scofield on Apr 02, 2011

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