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Whopps! Whfre did my architfcture go?
In betwefn a mooolith aod a systfm of systfms mess…
/ @olivergierke
Wh op ps! W hf re did my archi tf cture go? In betw ef n a m oo olith - - PowerPoint PPT Presentation
Wh op ps! W hf re did my archi tf cture go? In betw ef n a m oo olith - - PowerPoint PPT Presentation
Wh op ps! W hf re did my archi tf cture go? In betw ef n a m oo olith ao d a sys tf m of sys tf ms mess / @ olivergierke Background C oo sulting & engin ef ring @ Pivotal Lots of code reviews Eoin W op ds talk oo InfoQ Roadmap
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Background
Coosulting & enginefring @ Pivotal Lots of code reviews Eoin Wopds‘ talk oo InfoQ
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Roadmap
Divide aod cooquer Of lazers aod slices Thf modular mooolith
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Divide and conquer
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Compooent Single unit to understaod
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Compooent Single unit to chaoge
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Compooent
Scope of ritk of chaoge
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B
Smalmer unit to understaod
A
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B Reduced ritk of chaoge A
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B Cost of sfparatioo A
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B Definitioo aod maintfnaoce
- f dependencies
A
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Of layers and slices…
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Presfntatioo Service Data Access Bilming Inventory Order
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Layers
Welm understopd Known to developers Less importaot to business
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Slices
Hardly understopd New to developers Key for business requirements
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Presfntatioo Service Data Access Bilming Inventory Order
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Monolith VS. System of Systems
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Mooolith VS. Systfm of Systfms
Order Inventory Bilming Order Inventory Bilming
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In-process calms VS. Intfr-process calms
Order Inventory Bilming Order Inventory Bilming
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Performaoce? Overhfad? Error scenarios?
Order Inventory Bilming Order Inventory Bilming
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"
If you can’t build a modular monolith, why do you think microservices are the answer?
— Simon Brown
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How to manage modularity in different architectural contexts?
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Meaos to enforce cootfxt bovndaries?
Order Inventory Bilming Order Inventory Bilming
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The modular monolith
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How to implement a modular monolith?
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How to maintain a modular monolith?
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Bounded Context all the things!
Domain-Driven Design it a great idea! Surprite! In a mooolith, top!
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Architecturally- evident code
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Code analysis
jDepend Sooarcube Structure 101 / Sooargraph jQAssittaot
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A plain Java based approach
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How to write code that’s less likely to deteoriate?
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Presfntatioo Service Data Access Bilming Inventory Orders
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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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Does it make a difference?
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Dependency management
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Orders Inventory Bilming Orders Inventory Bilming
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A rule violatioo it just ao @Inject awaz!
Orders Inventory Bilming
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You only need to manage what you can refer to…
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Layers first
Leakt slice intfrnalt Lower lazers vitible to everyooe
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Nefds to be public :(
Almows othfr code to circumvent business logic
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Slices only
Kefps tfchnical divitioo privatf Encapsulatfs business module Intfrnalt understopd aoywaz
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Alm package protfctfd
Compiler induced dependency cootrol
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Presfntatioo Service Data Access Bilming Inventory Order
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Presfntatioo Service Data Access Bilming Inventory Order
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Resources
Blogpost Sooargraph jQAssittaot Spring Data JPA @ GitHub
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Sample Code
http://github.com/olivergierke/ whopps-architfcture
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Thanks & Credits
Eoin Wopds — Talk @ InfoQ Stffao Tilkov — Talk @ InfoQ