This document discusses clean architecture principles and how to enforce them using ArchUnit. It provides an example of defining architectural rules that specify which layers controllers, use cases, and entities belong to, and which layers they can access. It also shows how to set up a Gradle build file to enforce dependencies between layers following the defined architecture.

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@mike_neck

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• twitter: mike_neck
• direct Java
• Groovy/Kotlin/Golang
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3. Clean Architecture

4. Clean Architecture

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⭕ ❌

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• ArchUnit
• Gradle ( Maven
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8. ArchUnit
• Java
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9. void architectureRule() {
JavaClasses classes = new ClassFileImporter()
.importPackages("example");
LayeredArchitecture architecture = layeredArchitecture()
.layer("Controllers").definedBy(
"example.api..", "example.presentation..")
.layer("Use-Cases").definedBy("example.application..")
.layer("Entities").definedBy("example.domain..")
.layer("Gateways").definedBy("example.infrastructure..")
.whereLayer("Controllers").mayNotBeAccessedByAnyLayer()
.whereLayer("Use-Cases")
.mayOnlyBeAccessedByAnyLayers("Controllers","Gateways");
architecture.check(classes);
}

10. Gradle
• Gradle( Maven) ( )
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• build.gradle
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11. controllers
use-cases
entities
dependencies {
}
dependencies {
api project(":entities")
}
dependencies {
implementation project(":use-cases")
}
main
dependencies {
implementation project(":entities")
implementation project(":use-cases")
implementation project(":controllers")
}

12. • Java / Kotlin
• ArchUnit
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