ljug-meetup-2023-03-hexagonal-architecture.pdf

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Hexagonale Architektur ist seit einigen Jahren ein beliebtes Thema in der Software Engineering Community. Nicht zuletzt durch den Microservice Trend der letzten Jahre ist es ein verbreiteter Architekturstil, der helfen kann Services zu strukturieren. Bei der Umsetzung kommt dabei oft die Frage auf, wie die Vorteile: Entkopplung der Geschäftslogik, Testbarkeit, Erweiterbarkeit und klare Anwendungsstruktur erreicht werden können. Video zum Talk ist unter folgendem Link auffindbar: https://youtu.be/sgAXtNv7LjM In diesem Talk stellen Otto und Sven ihre Erfahrungen im Einsatz von Hexagonaler Architektur aus der Praxis vor und gehen auf die essentiellen Bestandteile ein und wie diese auf die verschiedenen Architekturziele einzahlen. Der Talk wendet sich an Entwickler und Architekten, die Benefits und Tradeoffs in der Anwendung Hexagonaler Architektur besser verstehen wollen.

Software

ANATOMIE EINER
HEXAGONALEN
ARCHITEKTUR
Lightweight Java User Group München
20. März 2023

OTTO
Solutions Architect @ Comsysto Reply
SVEN
Solutions Architect @ Comsysto Reply

Hexagonal
Architecture
2005
Alistair Cockburn
“Ports & Adapters Architecture”
- Separation of Concerns
- (UI & DB) Testability & Mockability
- “Primary/Secondary” or
“Driving/Driven” Adapters
- Use Cases as Application Boundary
https://alistair.cockburn.us/hexagonal-architecture/

Onion
Architecture
2008
Jeffrey Palermo
- Separation of Concerns via Controlled Coupling
- Application Core: Object Model
(Domain Model) with Business Rules
- Externalize Infrastructure
- Relies on Dependency Inversion
https://jeffreypalermo.com/2008/07/the-onion-architecture-part-1/

Clean
Architecture
2012
Robert C. Martin
- The Dependency Rule
- Entities encapsulate Business Rules
- Use Cases as Layer
- What and how to cross boundaries: Flow
- Different wording, similar concepts
https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html

Enter the
Microservice Hype
2012+
- Microservices
- Domain-Driven Design (DDD)
- CQRS
- …
-
We need to talk!
DDD, Hexagonal, Onion, Clean, CQRS, … How I put it all together

There is one
essential thing …
… there is the inside and the outside …
Alistair Cockburn
Dennis Hamilton - https://www.flickr.com/photos/orcmid/1850093537/

There is one
essential thing …
.. and it needs to be connected …

Separate
Technologies
Does this look familiar?

Does this look familiar?
Separate
Technologies

Separate
Representations
Have it your way …

It’s a Question of
Ownership
In a layered architecture …

It’s a Question of
Ownership
In a hexagonal architecture …

There is another
thing …
… but it is often not so important to
differentiate …

Incoming vs.
Outgoing Ports
… the same goes for adapters …

Incoming Ports
… are often use case centric …

Outgoing Ports
… are often domain object centric …

What is my domain
anyway?
https://github.com/ddd-crew/core-domain-charts

- Think domain first
- Use the domain objects in the ports
if possible
- Isolate technologies in the adapters
- Move business logic as far to the
center as possible
It’s not so
complicated

- Better testability
- Easier to understand
- Easier to adapt to technological
changes
- Easier to guard against regressions
- Easier to focus on business code
And the beneﬁts
are …

DANKE
FÜR EURE
AUFMERKSAMKEIT!
https://www.comsystoreply.com
@comsysto
www.comsysto.tv

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A great deal of attention in medical devices has shifted towards cybersecurity with the ratification of section 524B of the FD&C act. This new law enables the FDA to enforce cybersecurity controls in any medical device that is capable of networked communications or that has software. In this webinar we will recap the process for managing vulnerabilities, identify categories of vulnerabilities and solutions and more.

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ljug-meetup-2023-03-hexagonal-architecture.pdf

1. ANATOMIE EINER HEXAGONALEN ARCHITEKTUR Lightweight Java User Group München 20. März 2023

2. OTTO Solutions Architect @ Comsysto Reply SVEN Solutions Architect @ Comsysto Reply

3. A little bit of history …

4. Hexagonal Architecture 2005 Alistair Cockburn “Ports & Adapters Architecture” - Separation of Concerns - (UI & DB) Testability & Mockability - “Primary/Secondary” or “Driving/Driven” Adapters - Use Cases as Application Boundary https://alistair.cockburn.us/hexagonal-architecture/

5. Onion Architecture 2008 Jeffrey Palermo - Separation of Concerns via Controlled Coupling - Application Core: Object Model (Domain Model) with Business Rules - Externalize Infrastructure - Relies on Dependency Inversion https://jeffreypalermo.com/2008/07/the-onion-architecture-part-1/

6. Clean Architecture 2012 Robert C. Martin - The Dependency Rule - Entities encapsulate Business Rules - Use Cases as Layer - What and how to cross boundaries: Flow - Different wording, similar concepts https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html

7. Enter the Microservice Hype 2012+ - Microservices - Domain-Driven Design (DDD) - CQRS - … - We need to talk! DDD, Hexagonal, Onion, Clean, CQRS, … How I put it all together

8. Let’s start with the essentials …

9. There is one essential thing … … there is the inside and the outside … Alistair Cockburn Dennis Hamilton - https://www.flickr.com/photos/orcmid/1850093537/

10. There is one essential thing … .. and it needs to be connected …

11. Why should I care?

12. Separate Technologies Does this look familiar?

13. Does this look familiar? Separate Technologies

14. Separate Representations Have it your way …

15. Okay, what do I have to do?

16. A Layered Architecture …

17. … and a Hexagonal Architecture …

18. It’s a Question of Ownership In a layered architecture …

19. It’s a Question of Ownership In a hexagonal architecture …

20. It’s a Question of Dependency

21. It’s a Question of Dependency

22. What's inside the Hexagon?

23. Inside the Inner Hexagon …

24. The most important parts …

25. There is another thing … … but it is often not so important to differentiate …

26. Things to note about ports …

27. Incoming vs. Outgoing Ports … the same goes for adapters …

28. Incoming Ports … are often use case centric …

29. Outgoing Ports … are often domain object centric …

30. What is my domain?

31. What is my domain anyway? https://github.com/ddd-crew/core-domain-charts

32. Distilled to …

33. - Think domain first - Use the domain objects in the ports if possible - Isolate technologies in the adapters - Move business logic as far to the center as possible It’s not so complicated

34. - Better testability - Easier to understand - Easier to adapt to technological changes - Easier to guard against regressions - Easier to focus on business code And the beneﬁts are …

35. DANKE FÜR EURE AUFMERKSAMKEIT! https://www.comsystoreply.com @comsysto www.comsysto.tv

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