[Solved] In designing a Library Management System, which component is best suited to handle the tracking of book loans and returns to ensure accurate availability status? | OOP & Design Patterns

OOP & Design Patterns - Design a Library Management System - LLD with Relationships & Edge Cases

In designing a Library Management System, which component is best suited to handle the tracking of book loans and returns to ensure accurate availability status?

AA separate LoanManager class that manages all loan and return transactions

BThe Library class, which maintains a global list of all books and their statuses

CThe User class, which tracks the books currently borrowed by the user

DThe Book class itself, by maintaining a status flag indicating availability

Step-by-Step Solution

Step 1: Understand Single Responsibility Principle
Tracking loans and returns involves managing transactions and state changes, which is best encapsulated in a dedicated LoanManager to avoid bloating Book or User classes.
Step 2: Why not Book class?
Embedding availability logic in Book violates SRP and complicates concurrency handling.
Step 3: Why not User class?
User should track borrowed books but not manage loan state transitions globally.
Step 4: Why not Library class?
Library manages collections but delegating loan logic to a specialized manager improves modularity and concurrency control.
Final Answer:
Option A -> Option A
Quick Check:
LoanManager centralizes loan logic, enabling better consistency and easier concurrency handling.

Quick Trick: Separate transaction logic from data entities for clarity and concurrency [OK]

Common Mistakes:

MISTAKES

Putting loan logic inside Book class
Letting User class handle global loan state
Overloading Library class with transaction details

Trap Explanation:

PITFALL

Options A, C, and B seem plausible because they relate to entities involved, but they mix responsibilities and complicate concurrency and state management.

Interviewer Note:

CONTEXT

Tests candidate's understanding of responsibility separation and component roles in LLD.

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More OOP & Design Patterns Quizzes

In designing a Library Management System, which component is best suited to handle the tracking of book loans and returns to ensure accurate availability status?

Step 1: Understand Single Responsibility Principle

Step 2: Why not Book class?

Step 3: Why not User class?

Step 4: Why not Library class?

Final Answer:

Quick Check:

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