Whoops! Where did my architecture go? Approaches to architecture - - PowerPoint PPT Presentation

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Whoops! Where did my architecture go? Approaches to architecture - - PowerPoint PPT Presentation

Feb 21, 2024 373 likes •1.06k views

Whoops! Where did my architecture go? Approaches to architecture management for Java and Spring applications Oliver Gierke Oliver Gierke SpringSource Engineer Spring Data ogierke@vmware.com olivergierke www.olivergierke.de Background 5

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Whoops! Where did my architecture go?

Approaches to architecture management for Java and Spring applications

Oliver Gierke

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Oliver Gierke

SpringSource Engineer Spring Data

  • gierke@vmware.com
  • livergierke

www.olivergierke.de

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Background

5 years of consulting Lots of code reviews Eoin Woods‘ talk on InfoQ

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"

If you think architecture is expensive, try no architecture.

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Macro VS. Micro Architecture

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Macro VS. Micro Architecture

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Sample Code

http:/ /github.com/olivergierke/ whoops-architecture

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Roadmap

Divide and conquer Of layers and slices A plain Java based approach

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Architecture 101

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Know your dependencies

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Explicit / Visible dependencies

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Granularity

Modules Layers Vertical slices Subsystems

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Granularity

Java ARchive Package Class

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Divide and conquer

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Component

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Component

Single unit to understand

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Component

Single unit to change

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Component

Scope of risk of change

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B A

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B A

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B

Cost of separation

A

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B

Definition and maintenance

  • f dependencies

A

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B

Smaller unit to understand

A

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B

Reduced risk of change

A

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Of layers and slices…

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Presentation Service Data Access

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Presentation Service Data Access

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Presentation Service Data Access

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Presentation Service Data Access Account Customer Core

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Presentation Service Data Access Account Customer Core

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Presentation Service Data Access Account Customer Core

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Layers

Well understood Known to developers Less important to business

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Slices

Hardly understood New to developers Key for business req

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Presentation Service Data Access Account Customer Core

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"

How to implement an architecture inside a codebase?

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Architecture VS. Codebase

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How to implement an architecture inside a codebase?

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How to implement an architecture inside a codebase?

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How to maintain an architecture inside a codebase?

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Code analysis

JDepend Sonar

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Demo

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Sonargraph

Formerly known as SonarJ

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Demo

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A plain Java based approach

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How far can we get with plain Java means only?

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Presentation Service Data Access Account Customer Core

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Packages

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….layer.slice ….slice.layer ….slice

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….web.core ….service.core ….repository.core

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….core.web ….core.service ….core.repository

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….core ….customer ….account

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"

Why the f#$k should I even care?

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Does it make a difference?

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Dependency management

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You only need to manage, what you can refer to…

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Layers first

Leaks slice internals Lower layers visible to everyone

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Slices first/only

Start with package per slice Expose interfaces and domain types Keep implementations private

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Slices first/only

Encapsulates business module Internals understood anyway

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"

Start with less packages and the least visibility possible…

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Presentation Service Data Access Account Customer Core

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Presentation Service Data Access Account Customer Core

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Demo

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Take-aways

Know your dependencies On every granularity Start as strict as possible Get lenient where necessary

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Resources

Spring Data JPA @ GitHub Sonargraph Blogpost

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Thanks & credits

Eoin Woods - Talk @ InfoQ Uwe Friedrichsen - Slides @ Slideshare