OOP & Design Patterns - Observer Pattern - Event System, Publish-Subscribe
Which of the following problems CANNOT be effectively solved using the Observer Pattern (Event System, Publish-Subscribe)?
Which of the following problems CANNOT be effectively solved using the Observer Pattern (Event System, Publish-Subscribe)?
easy🔍 Pattern Recognition Q2 of Q15
Step-by-Step Solution
Solution:
Step 1: Analyze each option
Options A, B, and D involve notifying multiple listeners; these are valid use cases for Observer.Step 2: Identify anti-pattern
Selecting an algorithm at runtime based on input is about algorithm selection, which is the Strategy Pattern, not Observer.Step 3: Confirm correct answer
Only Selecting an algorithm at runtime based on input cannot be solved by Observer Pattern.Final Answer:
Option B -> Option BQuick Check:
Algorithm selection is Strategy, not Observer [OK]
Quick Trick: Algorithm selection -> Strategy, not Observer [OK]
Common Mistakes:
MISTAKES- Confusing Strategy with Observer
- Assuming all event broadcasting fits Observer
- Ignoring coupling requirements
Trap Explanation:
PITFALL- Candidates often pick broadcasting as invalid, but it's a core Observer use case; algorithm selection is the true anti-pattern here.
Interviewer Note:
CONTEXT- Tests ability to distinguish Observer from other design patterns and recognize anti-patterns.
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