This document discusses service-oriented architecture (SOA) and how Ruby on Rails can be used to build SOA systems. It defines a service as a system that responds to HTTP requests, usually to modify or retrieve data. The document explains benefits of SOA like isolation, scalability, and reusability. It also introduces some Ruby tools like Sinatra and HTTParty that are useful for building RESTful services and APIs.

1. SOA AND RUBY ON RAILS
a product case study for NYC on Rails
Avi Flombaum July 6th 2011
DesignerPages.com Infogroup

2. WHAT’S A SERVICE?
a system that responds to HTTP Requests,
usually to write, retrieve, or modify data.
Service Client
Amazon AWS: S3 DesignerPages.com
HTTP PUT
PUT /ergoergo.jpg HTTP/1.1
Host: designerpages.amazonaws.com
Date: Wed, 12 Oct 2009 17:50:00 GMT
Authorization: AWS 15B4D3461F177624206A:xQE0diMbLRepdf3YB+FIEXAMPLE=
Content-Type: text/plain
Content-Length: 11434
Expect: 100-continue
[11434 bytes of object data]

3. WHAT’S A SERVICE?
Services can be internal.
“If you hit the Amazon.com gateway
page, the application calls more than
100 services to collect data and
construct the page for you.”
Werner Vogels, Amazon.com CTO

5. INTERNAL SERVICES
loads via 4 requests, total time10ms
10ms 4ms 1ms 9ms
New For You Recommendations Ad Units Bestsellers

6. BUT WHY SOA?
Isolation (encapsulation)
rails application
Product Authentication
News
Search
DB

7. BUT WHY SOA?
Isolation
news.designerpages.com designerpages.com
Sinatra Rails
Application Application
DB DB

8. BUT WHY SOA?
Benefits of Isolation
•Robustness
You can upgrade an underlying system without effecting
clients
•Scalability
Each isolated system can scale independently
•Organization
Isolated systems are easy for teams to work on
•Testing
An encapsulated system is easier to test, single functionality
•Agility
You can make gradual improvements to smaller systems

9. BUT WHY SOA?
And some more
•Speed
Parallel Requests
•Interoperability
Instant API
•Reuse
Client wrappers

10. BUT WHY SOA?
And finally, a practical reason

11. THE RUBY SOA TOOLSET
Sinatra - http://www.sinatrarb.com/
Sinatra is a DSL for quickly creating web applications in
Ruby with minimal effort:
# myapp.rb
require 'rubygems'
require 'sinatra'
get '/' do
'Hello world!'
end
#=> ruby myapp.rb
#=> == Sinatra/1.2.1 has taken the stage on 4567 for development
#=> >> Thin web server (v1.2.11 codename Bat-Shit Crazy)
#=> >> Maximum connections set to 1024
#=> >> Listening on 0.0.0.0:4567, CTRL+C to stop
#=> 127.0.0.1 - - [06/Jul/2011 06:48:25] "GET / HTTP/1.1" 200 12 0.0038
#=> curl http://localhost:4567
#=> Hello world!

12. THE RUBY SOA TOOLSET
httparty - a party in your http
A simple module that turns a class into a basic HTTP
wrapper.
require 'rubygems'
require 'httparty'
class Twitter
include HTTParty
base_uri 'search.twitter.com'
format :json
end
Twitter.get('/search.json', :query => {:q => "#rubyonrails"})
['results'].first['text']
#=> "Who is going to NYC on Rails tonight? http://dsgnr.us/qrdh21 #rubyonrails"

13. NOW FOR SOME CODE...

14. THANKS!