Microservices done right or SOA lessons learnt - Sean Farmar - Codemotion Milan 2016

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SOA has been around for a while, now microservices is the new black, that’s cool, but lets look at what we learnt when we failed and succeeded implementing SOA.

Tecnologia

Microservices Done
Right
(or SOA Lessons Learnt)
Sean Farmar
MILAN 25-26 NOVEMBER 2016

Microservices Done
Right
(or SOA Lessons Learnt)
Sean Farmar
@farmar

My journey to SOA
Tried all “Best Practices”
Layers and Tiers
Distributed monoliths using Web Services
… and failed

Solve the problem you want?
mmmm…
Coupling your problem is…

Temporal
(time, synchronous communication)
Spatial
(physical, deployment, endpoint
address)
Platform
(protocols, .Net Remoting)
Coupling
Dimensions

Fallacies of
Distributed
Computing
var svc = new MyService();
var result = svc.Process(data);

Fallacies of
Distributed Computing
1. The network is reliable. (Bill Joy and Tom Lyon)
2. Latency is zero. (Bill Joy and Tom Lyon)
3. Bandwidth is infinite. (Bill Joy and Tom Lyon)
4. The network is secure. (Bill Joy and Tom Lyon)
5. Topology doesn’t change. (Peter Deutsch)
6. There is one administrator. (Peter Deutsch)
7. Transport cost is zero. (Peter Deutsch)
8. The network is homogeneous. (James Gosling)

The Fallacies EBook
• Go to: http://go.particular.net/codem16
• Ted Neward’s blog:
http://blogs.tedneward.com/post/enterpri
se-computing-fallacies/

Why Microservices?
Break down the monolith

Why SOA /
Microservices?
“Address coupling in our software
design by building loosely coupled and
highly encapsulated components”
Udi Dahan

Encapsulation
Autonomy
Decomposing business entities
SRP (Single Responsibility Principle)
Be explicit
Keep your vertical slice thin, top to bottom

Monolith
UI
BL
DAL
DB
Tight Coupling
Loose Coupling

Vertical Slicing
UI
BL
DAL
DB Referential Integrity
Tight Coupling
Loose Coupling
Re-introduces Coupling
Sales
Conten
t
CRMOps

Lessons learnt
It’s hard (er)
Messaging:
Asynchronous fire and forget, Pub/Sub
CQ(R)S: Separating data writes and data
reads
Use messaging only if it suites

Lessons learnt(cont.)
Decomposing your business domain is
hard, no framework/tools will magically fix
that
Data (write) ownership
Referential integrity and GUIDS
Data reads and eventual consistency

Lessons learnt(cont.)
Monitoring - Lights on
Testing is HARD
Deployment - Automate everything
Organization and people, trust
Be pragmatic but keep the paradigm

Summary
• Avoid all dimensions of coupling
• Avoid synchronous communication between
components/microservices,
• Don't share data, use view/read models to share read only
data
• Decomposing your business domain and entities
• You can do it on .Net platform using NServiceBus
• Blog post: http://particular.net/blog/goodbye-
microservices-hello-right-sized-services
• Fallacies EBook: http://go.particular.net/codem16

Q&A
Thank You!
Sean Farmar
twitter: @farmar
Particular.net

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