# Event Driven

Event-driven architecture is modeled as events, publishers, and subscribers.

```ruby
architecture :event_driven,
  events: "app/events/**/*.rb",
  publishers: "app/publishers/**/*.rb",
  subscribers: "app/subscribers/**/*.rb"
```

This checks:

- event definitions do not depend on publishers or subscribers
- publishers only depend on declared events
- subscribers only depend on declared events
- the declared components do not form cycles

The Rails default is:

```ruby
preset :rails_event_driven
```

This is intentionally narrow. It checks source-level coupling, not event delivery semantics.