스프린트 과제

• Business Logic** = “What your app DOES”
  • The rules and processes of your application
  • What makes your app unique and valuable
  • Would be the same regardless of where you store data (file, database, memory)
• Storage Logic = “HOW data is saved/loaded”
  • Technical details of reading/writing data
  • File operations, database queries, serialization
  • Could be replaced with different storage methods

Ask yourself:

1. “Would this code change if I switched from files to a database?”
   • If YES → Storage Logic
   • If NO → Business Logic
2. “Is this about the rules of my application or about saving data?”
   • Rules → Business Logic
   • Saving → Storage Logic

Keywords that hint at Storage Logic:

• FileInputStream, ObjectOutputStream
• saveAll(), getUsers(), readFromFile()
• File paths, serialization, I/O operations

Keywords that hint at Business Logic:

• Validation (if name is empty)
• Business rules (user can only join once)
• Calculations (calculate user score)
• Workflows (send notification after update)

과제의 저장 로직

• saveAll

• getChannels/getUsers/getMessages

• 구조 정리

  • Service
  • Repository