SELinux has essentially seven types of statements:
Rescued hedgehog's recovery 'made our Christmas'
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Actions that originate in the Infra-Module (i.e. incoming IoT signals) invoke classes in the Business-Module directly. There’s no need for any interface here. The Infrastructure-Module bootstraps the Business-Module, so it can just as well inject a real implementation to its classes. (In rare situations, an extra abstraction layer might be needed, but it should not be a default option).
Unified IT and data model in the production system