Event-Driven Architectures

Event-Driven Architecture (EDA) is a design pattern where components communicate by emitting and reacting to events. Instead of directly calling functions, parts of your system publish events when something interesting happens.

This approach helps create systems that are:

• Decoupled: Components don't need to know about each other.
• Scalable: Easily add more consumers without changing producers.
• Resilient: Failures in one part are less likely to bring down the whole system.

An event is a record of something that happened. It's usually a small, immutable message containing data about the event, but not the command to perform an action.

Think of it like a newspaper headline: "User Signed Up" or "Order Placed".

Key characteristics:

• Fact: It describes something that has occurred.
• Immutable: Once published, an event doesn't change.
• Informative: Contains relevant data (e.g., user ID, timestamp).