Use cases accept simple request objects for input and return simple response objects for outputs.Use cases are specific to a single application.Follows the Dependency Inversion Principle – higher level components know nothing of the lower level components – the direction is inverted.Entities have no knowledge of how use cases use them.The how of data gets in and out is irrelevant to the use case.These also indicate the inputs and outputs but not where they come from (database, UI, etc.).These indicate how and when a critical business entity should be invoked.Use case – description of how an automated system is to be used.There are additional business rules that are not “critical” – they define how the automated system should work, but would have no impact on a manual business operation.No dependencies on databases, 3rd party dependencies, user interfaces, etc.These should be separated from every other concern in the application.An object that contains critical business rules and critical business data.Critical business rules and data are tightly bound and therefore a good space for an object, also called….
Critical business data – critical data that would exist even if there wasn’t an automated system.Critical business rules – rules critical to the business itself, with or without a computer, for example, calculating interest on a loan.
Clarification: The Output window tip for SQL Server Management Studio is specific to SSMS 2017.iTunes: Tillman32, Satisfied photo printer, Cyclomatic Double Complexity, portugueezy.Thank you to everyone that left us a review:.