EventSourcingArchitektur

EventSourcingA is a software architectural pattern where all changes to application state are stored as a sequence of immutable events. Instead of updating a database directly with the new state, the application records that an event has occurred. This event log becomes the single source of truth for the application's state. To reconstruct the current state, the application replays all the events from the beginning up to the current point in time.

This approach offers several advantages. Firstly, it provides a complete audit trail of all changes, making it easier to understand how the application's state evolved. This can be invaluable for debugging, auditing, and compliance. Secondly, event sourcing allows for temporal queries, meaning you can reconstruct the state of the application at any point in the past. This is useful for historical analysis or understanding past user behavior.

Furthermore, event sourcing facilitates easier integration with other systems. Events can be published and consumed by other services, enabling a more event-driven architecture. It also simplifies complex business logic by allowing developers to focus on modeling discrete events rather than state transitions.

However, event sourcing also introduces complexities. Replaying a large number of events to reconstruct state can be performance-intensive, often requiring optimization techniques like snapshots. Managing the event log and ensuring its integrity are also critical considerations. Developers need to carefully design event schemas and handle potential versioning issues as the application evolves.