What patterns would you apply to design a scalable message processing system? Discuss both architectural and design patterns, and their pros and cons.

``` Utilize patterns such as Publish-Subscribe for decoupling producers and consumers, and the Circuit Breaker pattern for resilience; assess trade-offs related to latency and throughput depending on message volume and reliability needs. Scenario Pressure: How do you ensure message delivery guarantees in case of failures? Depth Trigger: Explore how your approach would differ between real-time processing versus batch processing. ```