Architecture & LLD Preview
Library Management
Manage book copies, member borrowing limits, reservations, and due-date / fine tracking.
Book (title) vs BookCopy (lendable unit), Member with a borrow limit, Loan with due date, a pluggable FineStrategy, and a FIFO reservation queue that holds a returned copy for the next member.
Core Design Challenge
"Design a library system — model titles vs physical copies, enforce borrow limits, track due dates and fines, and queue reservations when all copies are out."
What You'll Learn:
- ✦Preventing double-booking using concurrency control
- ✦Modeling reservation states (Pending, Reserved, Paid, Cancelled)
- ✦Designing database schemas (User, Show, Seat, Booking)
- ✦Scaling seat allocation under high concurrent user load