Event-Driven Architecture

Question 1

What is an event?

Answer 1

An event represents the availability of information. Basically, something happened. Examples: user_created and user_updated.

Question 2

When should we use events?

Answer 2

1 - To decouple components
2 - To perform async tasks
3 - To keep track of state changes (audit log)

Question 3

What is an Event Listener?

Answer 3

Event Listeners react to only one event and can have multiple methods reacting to it.

Question 4

What is an Event Subscriber?

Answer 4

Event Subscribers react to multiple events and have multiple methods reacting to them.

Question 5

What are the types of event patterns?

Answer 5

• Event Notification
• Event-Carried State Transfer
• Event-Sourcing