The image above shows a pair of modules, where the green one is the Business-Modules with a complex logic. Whenever it needs to invoke code external to itself (e.g. save an entity or send a message to a message bus), it exposes a public interface and invokes its methods instead. Thanks to that, it has no code dependencies (i.e. compile-time dependencies) on the Infrastructure-Module. The blue infra-module has the dependency on the Business-Module, because it implements the Business-Module’s interface. This module contains all the code related to database connectivity and RabbitMq handling. But it also bootstraps the Business-Module, for instance, it hooks up its classes as implementation of Business-Modules interfaces in the Dependency Injection container (DI/IoC container).
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