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Which component in a notification system is responsible for deciding how to deliver a notification?

easy🧠 Conceptual Q2 of Q15
LLD - Design — Library Management System
Which component in a notification system is responsible for deciding how to deliver a notification?
AEvent generator
BNotification dispatcher
CUser database
DMessage queue
Step-by-Step Solution
Solution:

  1. Step 1: Identify the role of the notification dispatcher

    The dispatcher determines the delivery method (email, SMS, push) for notifications.

  2. Step 2: Understand other components' roles

    Event generator creates events, user database stores user info, message queue buffers messages but does not decide delivery.

  3. Final Answer:

    Notification dispatcher -> Option B

  4. Quick Check:

    Delivery decision = Dispatcher [OK]
Quick Trick: Dispatcher chooses delivery channel for notifications [OK]
Common Mistakes:
MISTAKES
  • Confusing event generator with delivery decision
  • Thinking message queue decides delivery
  • Assuming user database controls notification sending

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