You need to add logging around an existing service without editing that service class. Which pattern is most appropriate?

Question

You need to add logging around an existing service without editing that service class. Which pattern is most appropriate?

Option A — Correct answer

Decorator

Decorator composes extra behavior around the existing service.

Option B

Singleton

Option C

Factory Method

Option D

Enum

Explanation

Decorator adds behavior around an object through composition while preserving the same contract.

Quiz: Design Patterns