Practice Verkada Coding Question | Real Coding Interviews

Quick Summary

Design a server class that manages two independent FIFO queues for user requests and camera responses.
Implement thread-safe, non-blocking APIs that maintain strict ordering without mutual blocking.
Ensure each user call generates a pending command while consuming any available logs in order.

What This Tests

Queue data structure mechanics and FIFO ordering guarantees.
Thread safety and concurrent access patterns in multi-threaded environments.
Decoupled producer-consumer architecture design.
Non-blocking state management and resource handling.

Common Patterns

Queue

You are building the middleware layer for a camera monitoring system. The server relays communication between users, who request camera logs for a timestamp, and cameras, which poll the server for pending commands and later send logs back.

Implement the CameraLogServer class. All APIs must be thread-safe and non-blocking, allowing users and cameras to interact with the server concurrently without waiting on each other:

CameraLogServer() Initializes an empty command queue and an empty log queue.

Test Cases

Input

Output

Expected