[Solved] You need to design a system where multiple independent modules must be notified automatically when specific events occur, without tight coupling... Which design pattern best fits this requirement? | OOP & Design Patterns

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

You need to design a system where multiple independent modules must be notified automatically when specific events occur, without tight coupling between the event source and listeners. Which design pattern best fits this requirement?

ASingleton Pattern

BObserver Pattern

CStrategy Pattern

DIterator Pattern

Step-by-Step Solution

Solution:

Step 1: Identify the problem characteristics
The problem requires automatic notification to multiple modules and loose coupling between source and listeners.
Step 2: Match with pattern intent
The Observer Pattern is designed for event-driven updates with dynamic subscription and loose coupling.
Final Answer:
Option B -> Option B
Quick Check:
Observer pattern fits event notification with loose coupling [OK]

Quick Trick: Loose coupling + event notification -> Observer Pattern [OK]

Common Mistakes:

MISTAKES

Confusing with Singleton which is about single instance
Mistaking Strategy for algorithm selection
Thinking Iterator handles event notifications

Trap Explanation:

PITFALL

Candidates often confuse Observer with Singleton or Strategy due to overlapping terms but miss the loose coupling and dynamic subscription aspect.

Interviewer Note:

CONTEXT

Tests candidate's ability to recognize event-driven design patterns from requirements.

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Solution Trace

More OOP & Design Patterns Quizzes

Which design pattern best fits this requirement?

Step 1: Identify the problem characteristics

Step 2: Match with pattern intent

Final Answer:

Quick Check:

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