Implement layer rules

[hohwille]

Implement the Layer-Rules with ArchUnit.

Acceptance-Criteria:

• Rules L1-L12 are implemented with ArchUnit
• Create Code that violates Layer Rules

[hohwille]

Skeleton for such an ArchUnit test:

@AnalyzeClasses(packages = "com.customer.app", importOptions = ImportOption.DoNotIncludeTests.class)
class ArchitectureTest
{

  @ArchTest
  private static final ArchRule shouldOnlyAccessValidLayers = 
    layeredArchitecture()
        .layer("common").definedBy("..common..")
        .layer("logic").definedBy("..logic..")
        .layer("dataaccess").definedBy("..dataaccess..")
        .layer("service").definedBy("..service..")
        .layer("batch").definedBy("..batch..")
        .layer("ui").definedBy("..ui..")
        .whereLayer("logic").mayOnlyBeAccessedByLayers("service", "batch")
        .whereLayer("dataaccess").mayOnlyBeAccessedByLayers("logic" /*, "batch"*/ )
        .whereLayer("service").mayOnlyBeAccessedByLayers("ui")
        .whereLayer("batch").mayOnlyBeAccessedByLayers("logic", "service")
        .whereLayer("ui").mayNotBeAccessedByAnyLayer()
        //.ignoreDependency(fullNameMatching(".*\\.ui\\.excuse4711\\..*"), fullNameMatching(".*\\.dataaccess\\.excuse4711\\..*"))
        .because("Dependency of technical layers violates architecture rules.");
        
  // ...

}