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 breakout session, we'll examine building an event-driven application and tackle the most common stumbling blocks of EDA, including: • How and where for maintaining state. • How to handle transactions that span multiple services. • REST or Kafka (or something else). • Asynchronous testing. We'll end by quickly (and easily) spinning up an event-driven application using Quarkus and Red Hat AMQ Streams (Apache Kafka).

1. CONFIDENTIAL Designator
New template
(thumbnail image, don’t use this slide)
1
Event Driven Architecture
With Quarkus, Kafka, and Kubernetes

2. CONFIDENTIAL designator
V0000000
Us
Summit2020
Tosin Akinosho
OpenShift Solutions Architect - Specialist
@tech0827
Jeremy Davis
Chief Architect
@argntprgrmr
2

3. CONFIDENTIAL designator
V0000000
Corporate slide templates
3
Topics:
Event Driven Architecture
Kafka (AMQ Streams)
Quarkus and Code
Kubernetes (OpenShift)

4. CONFIDENTIAL designator
V0000000
4
The Topic of this Talk
Why You Should CareEvent Driven
Architecture

5. CONFIDENTIAL designator
V0000000
So What
5
Why Event Driven Architecture?
Scalable
Replayable
Modifiable

6. CONFIDENTIAL designator
V0000000
Event Storming
Deliberate,CollectiveLearning
6
▸ https://www.eventstorming.com
▸ https://www.eventstorming.com/book/

7. CONFIDENTIAL designator
V0000000
Domain Driven Design
TacklingComplexityintheHeartofSoftware
7
▸ Domain Driven Design
▸ Implementing Domain Driven Design

8. CONFIDENTIAL designator
V0000000
The colors mean something
vSummit Cafe Event Storm
8
Order Placed, Beverage Order Processed, Kitchen Order Processed, Customer Notified

9. CONFIDENTIAL designator
V0000000
The Only Thing that Actually Matters
Code
9
Cafe.java

10. CONFIDENTIAL designator
V0000000
10
Optional section marker or title
Apache Kafka® is a
distributed streaming
platform.
Apache Kafka
(AMQ Streams)

11. CONFIDENTIAL designator
V0000000
Apache Kafka
11
Why Kafka?
Append only (event logs, #ftw)
Reliable, Scalable, Durable, Performant
Replayable

12. CONFIDENTIAL designator
V0000000
Apache ActiveMQ, Artemis, Qpid, and Kafka
Apache Kafka (AMQ Streams)
12
We Rename Everything

13. CONFIDENTIAL designator
V0000000
13
Supersonic, Subatomic Java
It’s really fast, productive,
and fun to use.
Quarkus

14. CONFIDENTIAL designator
V0000000
Corporate slide templates
14
Why Quarkus?:
Easy, Fast, Fun
Microprofile Reactive Messaging
Kubernetes Native

15. CONFIDENTIAL designator
V0000000
Optional section marker or title
15
In this part of the presentation:
Deploying to OpenShift (Kubernetes Native)
Test Driven Development
Quarkus Dev Mode
Microprofile Reactive Messaging

16. CONFIDENTIAL designator
V0000000
16
The Kubernetes Platform for Big Ideas
OpenShift Container
Platform
Kubernetes
(OpenShift)

17. CONFIDENTIAL designator
V0000000
Enterprise Kubernetes
17
Why OpenShift (Kubernetes):
Scalability
Makes Kafka Easy
Makes Microservices Easy Easier

18. CONFIDENTIAL designator
V0000000
Operators
AMQ Streams on OpenShift
18
AMQ Streams (Kafka) and OpenShift (Kubernetes)

19. CONFIDENTIAL designator
V0000000
Your Application(s) and Dependenices
OpenShift Developer View
19
Easier Microservices

20. CONFIDENTIAL designator
V0000000
What We Just Talked About
20
Summary:
Event Driven Architectures are Scalable and Efficient
So is OpenShift, and Kafka, and Quarkus

21. CONFIDENTIAL designator
V0000000
https://github.com/jeremyrdavis/quarkus-cafe-demo
Summit2020
Tosin Akinosho
OpenShift Solutions Architect - Specialist
@tech0827
Jeremy Davis
Chief Architect
@argntprgrmr
21

22. CONFIDENTIAL designator
V0000000
22
Red Hat Integration
YouTube
GOTO 2018 • 50.000 Orange Stickies Later • Alberto Brandolini
Eric Evans — Tackling Complexity in the Heart of Software
Links
https://domainlanguage.com/
Implementing Domain Driven Design
https://www.eventstorming.com/
https://dddcommunity.org/