[Solved] You need to design a system where user actions can be executed, undone, and redone, while also supporting queuing of commands for batch execution... Which design pattern best fits this requirement? | OOP & Design Patterns

OOP & Design Patterns - Command Pattern - Undo/Redo, Request Queuing & Logging

You need to design a system where user actions can be executed, undone, and redone, while also supporting queuing of commands for batch execution and logging each command's lifecycle. Which design pattern best fits this requirement?

ACommand Pattern

BObserver Pattern

CStrategy Pattern

DDecorator Pattern

Step-by-Step Solution

Solution:

Step 1: Identify pattern that encapsulates requests as objects
The Command Pattern encapsulates requests, allowing execution, undo/redo, and queuing.
Step 2: Exclude other patterns based on requirements
Observer is for event notification, Strategy changes algorithms, Decorator adds behavior dynamically; none support undo/redo or queuing commands.
Final Answer:
Option A -> Option A
Quick Check:
Command Pattern supports undo/redo and queuing [OK]

Quick Trick: Undo/redo and queuing require command encapsulation [OK]

Common Mistakes:

MISTAKES

Confusing Strategy with Command for behavior changes

Trap Explanation:

PITFALL

Candidates often confuse Strategy with Command because both encapsulate behavior, but only Command supports undo/redo and queuing.

Interviewer Note:

CONTEXT

Tests candidate's ability to recognize pattern from problem description

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Solution Trace

More OOP & Design Patterns Quizzes

Which design pattern best fits this requirement?

Step 1: Identify pattern that encapsulates requests as objects

Step 2: Exclude other patterns based on requirements

Final Answer:

Quick Check:

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