AWS, Play! CouchDB: Scaling SOA in the cloud

Christophe Marchal | Software Architect

christophe.marchal@ilegra.com

@toff63

http://github.com/toff63

http://francesbagual.net

About me

www.ilegra.com

Project

● MVP for

● 6 months

● Brazilian taxation

● 5 Developers + 1 Product Owner

Requirements

● Cadastre

● NFe validation

● Taxation violation reports

● Fix prices simulator

● Quotation price simulator

Non Functional goals

SOA

SOA para um prototipo?!

When I say SOA people think: Framework

When I say SOA people think: Framework

When I say SOA people think: Highly Complex System

When I say SOA people think 5 year project

However, SOA is about Principles

SOA

SOA is about decoupling

SOA is about SOC

SOA is about Flexibility

Strategic goal: get the MVP ready on time

➔ Minimum viable architecture➔ Minimum viable design➔ Only create tests that are relevant➔ Remove any waste

Evolutionary refinement

Definition of services

Define the first services:● NFe● Report● Company● User

Choosing Play!

HTTP server

Lightweight

Stateless

Easy to learn

Functional

Easy to create

API

AsynC IO

REACTIVE

Play SubProject

Play HTTP client

Play HTTP client: Internal Calls

Service design

Contract

Presentation

Service Layer

Persistence Gateway

Contract / Trait

HTTP + HTML

● Simple design

● SOC

● Trait yet in place for future separation

● Lightweight

Monolithic deploy: pre containers solution

NFe

user Reportcompany

● 1 debian package

● Each module independant

● No current need to have deploy isolation

● No current need to separate by service

profile

AWS Deploy

1 conf to rule them all with AWS private DNS

Application config:● couchdb.internal● redis.internal

DNS configuration change in every environment

What kind of NoSQL ?

● NFe is a document

● Huge amount of NFe to store

Why CouchDB?

● HTTP Interface

● Incremental map/reduce

● Polyglot Persistence ready

● Easy and simple to use

CouchDB: DB and Documents

http://mycouchdbserver:5984/pessoas http://mycouchdbserver:5984/pessoas/1

CouchDB: Design documents

http://mycouchdbserver:5984/pessoas/_design/list_v1

SOA with CouchDB

● Version your document

● Version you Design Document

● You can get backward compatibility in your database

● Ease database index migrations

● Let you do Canary Deploys

● Let you do Continuous Deployment with no downtime

HOW

BENEfits

AWS Deploy

ElasticSearch for filtering

ElasticSearch for filtering

Almost no db is shared between services

NFE Service Report Service

NFe

But a scalable solution would be ...

Summary

● SOA isn’t about project size

● SOA can be applied to any project

● Don’t rush to complexity

● Create proper abstractions to handle potentials future problems

● Version everything in your system

● Take advantage of the cloud

Christophe Marchal | Software Architect

Thanks for your Attention! Any question?