GenEvent for Event Handling

Imagine you have many parts of your application that need to react to something happening, like a user logging in.

If each part directly calls every other part, your code becomes tightly coupled and hard to change. This is where event handling comes in!

Erlang's OTP (Open Telecom Platform) provides a powerful behavior called gen_event for building decoupled event handling systems.

• It implements the publisher-subscriber pattern.
• Publishers send events without knowing who will receive them.
• Subscribers (called handlers) register to receive specific events.
• This promotes loose coupling and makes systems more flexible.