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DESCRIPTION
SOA is an approach to application design that allows us to build robust, scalable software. This is not about scary enterprise systems, this is about building applications with interoperable, lean services that can provide incredible flexibility and freedom. You will learn the pros (and cons) of this approach, and how you can apply it to your own projects. Using common idioms like REST, HTTP and message queues, complex applications can appear simple again. Simplicity leads to better design, increased agility and developer happiness.
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serviceoriented
architecture
serviceoriented
architecture
Working memory
Fight back!- Solid OO techniques- Refactoring- Paying back technical debt- Test driven development- Continuous integration
Easy to change
Service Oriented
Architecture
SOABuild applications
out of smaller ones
Services =
HTTP =
REST+
Message queues
REST
Message queues
SQS, RabbitMQ, ActiveMQ, Resque, etc
OO principles - Single responsibility- Loose coupling- Cohesion- Encapsulation
Real world?There are no rules
auth
users
front-end
blog
socialreviews
recommendations
stock shippingpayments
tagsbaskets
history
Online record shop
Extract functionality
intoservices
Reviews
Recommendations
Product info
Stock levels
reviews-service
REST + JSON
reviews-serviceGET /reviews/idPOST /reviewsPATCH /reviews/idDELETE /reviews/id
reviews-serviceGET /reviews/id
{ json }
reviews-servicePOST /reviews
{ json }
reviews-service
{ json }
BONUS: Client-side rendering!
reviews-serviceapplication/json
text/html
Isolated
Reusable
Interoperable
Agile
Scalable
Robust
Shipping
shipping-service
Shop Shipping-service
Message queue
{ order details }
/api/shippings
IsolatedReusable
InteroperableAgile
ScalableRobust
hydra.ioAPI for building &
profiting from digital image apps
/uploads /products /orders/artworks
imageprocessing
hydra.io
/uploads /products /orders/artworks
imageprocessing
hydra.io
/uploads /products /orders/artworks
imageprocessing MongoDB MongoDB MongoDB
S3
hydra.io
/uploads /products /orders/artworks
imageprocessing MongoDB MongoDB MongoDB
S3
hydra.io
/uploads /products /orders/artworks
imageprocessing MongoDB MongoDB MongoDB
S3
message queue (resque)
hydra.io
/uploads /products /orders/artworks
imageprocessing MongoDB MongoDB MongoDB
S3
message queue (resque)
hydra.io
/uploads /products /orders/artworks
imageprocessing MongoDB MongoDB MongoDB
S3
message queue (resque)
hydra.io
/uploads /products /orders/artworks
imageprocessing MongoDB MongoDB MongoDB
S3
message queue (resque)
hydra.io
api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)
/uploads /products /orders/artworks
imageprocessing MongoDB MongoDB MongoDB
S3
message queue (resque)
hydra.io
api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)
/uploads /products /orders/artworks
imageprocessing MongoDB MongoDB MongoDB
S3
message queue (resque)
admin tools
api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)
/uploads /products /orders/artworks
imageprocessing MongoDB MongoDB MongoDB
S3
message queue (resque)
admin tools
api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)
/uploads /products /orders/artworks
imageprocessing MongoDB MongoDB MongoDB
S3
message queue (resque)
admin tools
backbone.js
hydra gem
api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)api.hydra.io proxy (HAProxy)
/uploads /products /orders/artworks
imageprocessing MongoDB MongoDB MongoDB
S3
message queue (resque)
Small, sharp tools
SOA is Lego
for developers
Change is easyChange is hard
PrefactoringDraw pictures &
simplify
When to extract into services?Mature functionality
EnvironmentsStaging
Caching at every layer
Performance
- Test in isolation- Integration tests
Testing
Everything
Automate
Warning!
Polyglot?
Reuse & Consistency
Nooo!
Centralised Database
Keep checking the big picture
/api/v2/gorillas
Versioning
Parallel HTTP requests
Small steps
Conclusions
1. Discipline pays
2. Minimise coupling
3. Small services
4. Reduce complexity
5. Check the big picture
START SMALLSTAY SMALL
The future
Recommended