What is the difference between event bus and pub-sub pattern?

What is the difference between event bus and pub-sub pattern?

The event bus is a communication mechanism that allows different components to communicate with each other, while the pub-sub pattern is a messaging pattern where publishers send messages without knowing who will receive them, and subscribers receive messages without knowing who sent them.

Can you give me an example of each?

Sure! In an event bus, a user action like clicking a button can trigger an event that other components listen to. In pub-sub, a weather service can publish updates about weather changes, and any interested subscribers, like a mobile app, can receive those updates.

Which one is better for scalability?

The pub-sub pattern is generally better for scalability because it decouples the sender and receiver, allowing for more flexible and scalable architectures.

Are there any downsides to using pub-sub?

Yes, some downsides include increased complexity in managing subscriptions and potential message delivery issues if not handled properly.