Introduction to cqrs

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Darius Sadowski

Slides from Code Mastery meetup 22 Mar 2017

Technology

CQRS EXPLAINED
DARIUSZ SADOWSKI (@DARSADOW)

IN PRACTICE
▸Command as a Request
▸Command Handler
▸Response is optional
▸… but it can be very helpful
▸State is still your main concern

COMMAND REFLECTS ONE
INTERACTION WITH THE
SYSTEM

WHEN INTERACTION
CHANGES ONLY ONE
HANDLER NEEDS TO CHANGE

WHY TO SEPARATE READ MODEL?
▸Prepare data for many different views
▸Transformation at write to keep data
readable
▸Integration with other systems
▸Performance

EVENT IS A DESCRIPTION
OF THE FACT OF THE PAST

EVENT CAN BE ADDED
BUT CAN’T BE MODIFIED

WHEN YOU KNOW WHAT
HAPPENED YOU CAN DO
QUITE A LOT WITH IT

TEXT
{GOOD THINGS} ABOUT EVENT SOURCING
▸Replay-ability
▸Undo
▸Audit trail
▸Reactive system modelling

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