The 24th Design Pattern: The Barzakh Pattern
### The 24th Design Pattern: The Barzakh Pattern The Gang of Four gave us 23 design patterns. They solved problems like object creation, composition, and interaction. But they were writing in 1994. Before cloud infrastructure. Before microservices. Before distributed systems became the default. And, perhaps most importantly, before every production engineer discovered what a 02:37 AM PagerDuty notification feels like. So I have a proposal for the unofficial **24th Design Pattern**: # The Barzakh Pattern Not an official addition to the GoF catalog. But perhaps a pattern we need for modern distributed systems. ### The Problem Modern systems don't only deal with business requests. They deal with everything the outside world can throw at them: - unexpected traffic - malformed messages - retries - duplicated events - abusive clients - noisy integrations - delayed dependencies - traffic arriving at the worst possible moment The dangerous assumption is: > **If an event re...
