[Solved] After implementing a plugin system following the Open/Closed Principle, you discover that some plugins require modifying... What is the best follow-up design approach to maintain OCP compliance? | OOP & Design Patterns

OOP & Design Patterns - Open/Closed Principle - Open for Extension, Closed for Modification

After implementing a plugin system following the Open/Closed Principle, you discover that some plugins require modifying core system behavior. What is the best follow-up design approach to maintain OCP compliance?

AIntroduce extension points and hooks in the core system to delegate behavior to plugins.

BAllow plugins to override core classes directly to customize behavior.

CRequire all plugins to submit patches modifying core code for approval.

DDisable plugins that need to modify core behavior to enforce strict OCP.

Step-by-Step Solution

Solution:

Step 1: Identify OCP-compliant extension
OCP requires core system to be closed for modification but open for extension.
Step 2: Analyze options
Allow plugins to override core classes directly to customize behavior breaks encapsulation and OCP by allowing direct overrides. Introduce extension points and hooks in the core system to delegate behavior to plugins introduces extension points/hooks, enabling plugins to extend behavior without modifying core. Require all plugins to submit patches modifying core code for approval violates OCP by requiring core modifications. Disable plugins that need to modify core behavior to enforce strict OCP is impractical and limits extensibility.
Final Answer:
Option A -> Option A
Quick Check:
Extension points allow behavior changes without core modification [OK]

Quick Trick: Use hooks/extension points to delegate behavior, not modify core [OK]

Common Mistakes:

MISTAKES

Allowing direct core overrides
Forcing core code patches

Trap Explanation:

PITFALL

Candidates may choose direct overrides or patches, violating OCP and risking instability.

Interviewer Note:

CONTEXT

Evaluates advanced OCP application and extensibility design.

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Solution Trace

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What is the best follow-up design approach to maintain OCP compliance?

Step 1: Identify OCP-compliant extension

Step 2: Analyze options

Final Answer:

Quick Check:

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