What happens when a message is retried in an event-driven system? It happens more often than you think. The worst case scenario is that the message is processed twice, and the side effects can also be applied more than once. Do you want your bank account to be double charged? I'll assume the answer is no, of course. You can use the Idempotent Consumer pattern to solve this problem. In this week's issue I'll show you: - How the Idempotent Consumer pattern works - How to implement an Idempotent...
