Enforcing boundaries through interface adapters
While our examination of controllers demonstrated how to handle incoming requests, Clean Architecture’s interface boundaries require careful attention to data flow in both directions. In this section, we’ll explore patterns for maintaining clean boundaries throughout our system, particularly focusing on the explicit handling of success and failure cases. These patterns complement our controllers and presenters while ensuring that all cross-boundary communication remains clear and maintainable.
Explicit success/failure patterns at boundaries
At our architectural boundaries, we need clear, consistent ways to handle both successful operations and failures. Operations can fail for many reasons— invalid input, business rule violations, or system errors—and each type of failure might need different handling by the external interface. Similarly, successful operations need to provide their results in a format...
