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In a Library Management System, when implementing a reservation queue for popular books, which approach best handles the edge case where a reserved book is lost or damaged before the next user can borrow it?

hard🚀 Application Q8 of Q15
OOP & Design Patterns - Design a Library Management System - LLD with Relationships & Edge Cases
In a Library Management System, when implementing a reservation queue for popular books, which approach best handles the edge case where a reserved book is lost or damaged before the next user can borrow it?
ACancel all reservations and require users to re-reserve once a new copy is available
BKeep the reservation queue unchanged and wait indefinitely for the copy to be replaced
CAutomatically remove the lost/damaged copy from inventory and notify all users in the reservation queue
DAllow the next user to borrow a different copy without updating the reservation queue
Step-by-Step Solution
Solution:

  1. Step 1: Handle lost or damaged copy appropriately

    The system must remove unavailable copies from inventory to maintain accuracy.

  2. Step 2: Notify users in the reservation queue

    Users waiting should be informed about the change to manage expectations and possibly adjust reservations.

  3. Step 3: Reject indefinite wait or silent changes

    Waiting indefinitely or silently changing copies breaks user trust and system correctness.

  4. Final Answer:

    Option C -> Option C

  5. Quick Check:

    Remove lost copy + notify queue ensures consistency [OK]
Quick Trick: Lost copy -> remove + notify reservation queue [OK]
Common Mistakes:
MISTAKES
  • Ignoring lost copy impact on reservations
  • Waiting indefinitely without action
  • Changing copies silently without notification
Trap Explanation:
PITFALL
  • Candidates may overlook inventory consistency and user notification in edge cases.
Interviewer Note:
CONTEXT
  • Tests handling of rare but critical edge cases in system design.
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