Event Driven Architectures are distributed, asynchronous, and scalable. The rise of real time decision making, the on-demand economy, explosion of data, and the adoption of microservices have all driven the adoption of event driven architectures. Event Driven code is reactive by nature and significantly different from imperative programming. In this workshop we build an event driven application using Red Hat’s Quarkus and AMQ Streams (Apache Kafka.) We will cover the basic building blocks of event driven architecture including * Domain Driven Design * REST or Kafka (or something else) * How and where to maintain state * Testing event driven systems

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Event Driven Architecture
With Quarkus, Kafka, and Kubernetes

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Me
CodepaLOUsa2020
Jeremy Davis
Chief Architect
@argntprgrmr
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The Topic of this Presentation
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Events What exactly?

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InAction!
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Demo

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QuarkusCafeArchitecture
Event Driven Architecture
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Event Storming
Deliberate,CollectiveLearning
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▸ https://www.eventstorming.com
▸ https://www.eventstorming.com/book/

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You Need a LOT of Space
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Event Storming
Past-Tense Verbs
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User
View
Aggregate
Command
Business Process
External System
Colors are a convention
and have meaning

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Home Office Events
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Event Storm

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▸ https://www.eventstorming.com
▸ https://www.eventstorming.com/book/
Domain Driven Design
TacklingComplexityintheHeartofSoftware
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Key Concepts
Important Things
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We aren’t going to cover
all of this stuff

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Bounded Contexts
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These used to bleed
together and cause
problems

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Ubiquitous Language
This Is Really, Really Important
Enables Collaboration
● Agreed upon by
domain experts and
dev team
● Constantly revisited
and kept current
● Starts with the
Domain Model
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Aggregates, Entities,
and Value Objects
You’ve Used Some of These All Along
Good OO Design and
a New Way of Looking at
(Some) Objects
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ReallyJustLookingatCode
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More Demo!

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We rename everything
Apache Kafka® is a
distributed streaming
platform.
Apache Kafka
(AMQ Streams)

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Apache Kafka
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Why Kafka (AMQ Streams)?

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Apache Kafka
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Why Kafka (AMQ Streams)?

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Apache ActiveMQ, Artemis, Qpid, and Kafka
Apache Kafka
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AMQ Streams
We Rename Everything

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Supersonic, Subatomic Java
It’s really fast, productive,
and fun to use.
Quarkus

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QuarkusisPrettyFun
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Even More Demo
Developer Joy

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The Kubernetes Platform for Big Ideas
Kubernetes
(OpenShift)

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Enterprise Kubernetes
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Why Kubernetes (OpenShift)?
Makes Microservices Easy Easier
Operators Make Kafka Easy Easier

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Operators
AMQ Streams on OpenShift
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AMQ Streams (Kafka) and OpenShift (Kubernetes)

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https://github.com/jeremyrdavis/quarkus-cafe-demo
CodepaLOUsa2020
Jeremy Davis
Chief Architect
@argntprgrmr
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