6002. Implement Abstract Factory for Multi-Cloud Storage (Part 67)
Observer PatternFactory Pattern
### Problem #6002: Implement Abstract Factory for Multi-Cloud Storage (Part 67)
**Domain:** `OOP & Design Patterns` | **Topic Focus:** `Observer Pattern, Factory Pattern`
Implement an optimized, production-grade solution for **Implement Abstract Factory for Multi-Cloud Storage (Part 67)**.
### Requirements:
1. Your code must handle boundary inputs, edge cases, and maintain optimal time & space complexity.
2. In production, this logic scales to high-throughput environments.
3. Return the exact computed result.
Example 1:
Input: Sample Input #6002
Output: Output 1
Explanation: Demonstrates correct execution for Observer Pattern in OOP & Design Patterns.
Constraints:
- Time Complexity: Optimal for standard production loads.
- Space Complexity: O(1) auxiliary or O(N) linear storage.
- Ensure memory safety, clean error propagation, and zero race conditions.