What is event sourcing and how does it work?

What is event sourcing and how does it work?

Event sourcing is a software architecture pattern where state changes are stored as a sequence of events. Instead of storing just the current state, you store all the events that lead to that state.

Can you give me an example of how event sourcing is used in applications?

Sure! In a banking application, instead of just storing the current balance, you would store every transaction as an event, like 'Deposit $100' or 'Withdraw $50'. This way, you can reconstruct the balance at any point in time.

What are the benefits of using event sourcing?

Some benefits include better audit trails, the ability to reconstruct past states, and improved scalability. It also allows for easier integration with other systems.

Are there any downsides to event sourcing?

Yes, it can introduce complexity in managing event schemas and may require more storage. Additionally, querying the current state can be less straightforward.