횡단 관심사

(in Aspect-oriented programming) Cross-cutting concern

The concern that doesn’t stay inside of any one module boundary such as:

• System-wide error-handling
• Contract enforcement (see Contract-driven development)
• Distribution concerns
• Feature variations
• Context-sensitive behavior
• Persistence
• Testing

Cross-cutting concern is inherent in complex systems. But cross-cutting concerns have a clear purpose and a natural structure. Cross-cutting concern’s natural structure is:

• Defined set of methods
• Module boundary crossings
• Points of resource utilization
• Lines of dataflow
• …

In AOP, we can use aspects to capture the structure of cross-cutting concerns explicitly in a modular way, linguistic and with tool support. Aspects are well modularized cross-cutting concerns.