Daniel Badura
Freelance Software Engineer
@danielbadura
daniel.badura@patchlevel.de
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● Enables state recreation by replaying events
● Provides historical data by design
● Simplifies auditing
● Facilitates new data views
● Models system behavior with events, not states
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Event Bus
Basics
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● Hotel Created
● Guest Reserved Room
● Guest Payed Reserved Room
● Guest Checked In
● Guest Checked Out
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● A Pattern from Domain-Driven-Design
● An Aggregate is a cluster of multiple Domain objects
● An Aggregate Root can be composed of multiple Aggregates
● Every access should go through the Aggregate Root
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● Which Aggregate
● When it happened
● In which order it happened
● And more information defined by the user
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● Is responsible for saving message in database
● Everything happens transactional
● Shipped Store is based on Doctrine DBAL
● Own implementation possible