The Problem
Modules need to react to changes in other modules without creating tight coupling. Direct method calls create dependencies that make the system rigid.
The Solution
Use integration events to communicate between modules. Modules publish events when something significant happens, and other modules can subscribe to react.
Benefits
- Loose coupling - Modules don’t need to know about each other
- Flexibility - Easy to add new subscribers
- Auditability - Events provide a clear record of what happened
- Path to microservices - Events translate well to message queues