[Solved] You are designing a system where multiple components need to be notified when certain... Which design approach best ensures loose coupling and efficient event delivery to interested components only? | OOP & Design Patterns

OOP & Design Patterns - Observer Pattern - Event System, Publish-Subscribe

You are designing a system where multiple components need to be notified when certain events occur, but each component only wants to receive notifications for specific event types. Which design approach best ensures loose coupling and efficient event delivery to interested components only?

AUsing a publish-subscribe pattern where components subscribe to event types and get notified only for those

BImplementing a centralized event queue that all components read from regardless of event type

CPolling each component periodically to check for event changes

DUsing a brute force approach where the subject notifies all components for every event

Step-by-Step Solution

Solution:

Step 1: Understand the problem constraints
The system requires notifying multiple components selectively based on event types, ensuring loose coupling.
Step 2: Identify the design pattern that supports selective notification
The publish-subscribe pattern allows components to subscribe to specific event types and receive notifications only for those, avoiding unnecessary updates and tight coupling.
Final Answer:
Option A -> Option A
Quick Check:
Publish-subscribe enables selective, decoupled notifications [OK]

Quick Trick: Selective notification requires publish-subscribe pattern [OK]

Common Mistakes:

MISTAKES

Assuming polling is efficient for event-driven updates

Trap Explanation:

PITFALL

Polling or brute force notify all observers, which wastes resources and couples components tightly.

Interviewer Note:

CONTEXT

Tests candidate's ability to recognize appropriate design patterns for event-driven systems.

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More OOP & Design Patterns Quizzes

Which design approach best ensures loose coupling and efficient event delivery to interested components only?

Step 1: Understand the problem constraints

Step 2: Identify the design pattern that supports selective notification

Final Answer:

Quick Check:

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