Cqrs, Event Sourcing

CQRS, Event Sourcing
Simplicity / Complexity
AshicMahtabhttp://www.heartysoft.com@ashic

UI
DB Schema
Validation
DTO Transformation
Controller
DTO Transformation
Service
Repository
“Domain”
IoC Containers
Projection
Caching
Lazy Loading
Leaky “Pointless” Abstractions

Simple, right?

I Hold Data(Just the way you want it)
I Did Stuff
Gimme Some Data
I Do Stuff
Please Do Stuff
Application

ReadModel
I Did Stuff
Gimme Some Data
Domain
Please Do Stuff
Application

Event Bus
I Hold Data(Just the way you want it)
Domain
I Did Stuff
Gimme Some Data
Read Model
I Do Stuff
Please Do Stuff
Application
Command Service

Testing
When_doing_tranche_payment_with…
What about changes? Does “refactoring” require you to change tests? That’s not refactoring.
Is the “BDD” output really human readable?

Testing with Events
Given:-An account with account holder named “John”, account id=1243, account type=Silver-Account 1243 is debited £200
When a request is made to withdraw £300 from account 1243
The request should fail stating “Account limit will be exceeded” as the reason. [pass]

Adding new features to existing application

Performance

Resources
www.cqrsinfo.com
Jonathan Oliver’s blog
RinatAbdullin’s blog
Ncqrs (github)
Google groups for CQRS / DDDD and Ncqrs

Cqrs, Event Sourcing

by Ashic Mahtab on Oct 10, 2011

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