Walkthrough

Introduces a database-driven architecture with repository pattern, DataSource abstraction layer, Docker MySQL setup, SLF4J logging dependencies, and an interactive CLI login system for account management and moon mission querying.

Changes

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant Main
    participant AccountRepository
    participant MoonMissionRepository
    participant DataSource
    participant Database as MySQL DB

    User->>Main: Start application
    Main->>DataSource: Create SimpleDriverManagerDataSource
    DataSource->>Database: Store connection parameters

    User->>Main: Enter username/password
    Main->>AccountRepository: findByUsername(username)
    AccountRepository->>DataSource: getConnection()
    DataSource->>Database: DriverManager.getConnection()
    Database-->>DataSource: Connection
    AccountRepository->>Database: Query account by name
    Database-->>AccountRepository: Account record
    AccountRepository-->>Main: Optional<Account>

    alt Login Success
        Main->>User: Show menu
        User->>Main: Select operation (e.g., list missions)
        Main->>MoonMissionRepository: listMoonMissions()
        MoonMissionRepository->>DataSource: getConnection()
        DataSource->>Database: DriverManager.getConnection()
        Database->>MoonMissionRepository: Query all missions
        Database-->>MoonMissionRepository: List<String>
        MoonMissionRepository-->>Main: Display results
        Main-->>User: Show output
    else Login Failure
        Main->>User: Retry or exit
    end

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

• JDBC implementation correctness: Verify SQL queries in AccountRepositoryImpl and MoonMissionRepositoryImpl for correctness, parameter binding, and result mapping
• Exception handling and resource management: Check Connection/PreparedStatement/ResultSet close semantics and exception wrapping patterns across repository classes
• SQL injection risk: Inspect prepared statement usage and verify all user inputs are parameterized
• Main.java refactoring: Review the new login loop, menu dispatch logic, and integration with repository objects for correctness and edge cases
• DataSource implementation: Validate SimpleDriverManagerDataSource's DriverManager wrapping, connection pooling absence, and error handling
• Type safety: Confirm Optional handling in AccountRepository methods and null-safety across repository implementations

Poem

🐰 A rabbit hops through repos new,
With DataSources and MySQL too,
Where Missions dance and Accounts align,
The interactive flows are oh-so-fine!
From JDBC chains to patterns clean,
The code now blooms—a sight unseen! 🌙✨

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