What is event sourcing architecture?

Event sourcing is a powerful architectural pattern that records all changes made to an application’s state, in the sequence in which the changes were originally applied.

What is event sourcing CQRS?

Event sourcing is an approach to data storing where instead of just the final result of data transformation, the whole chain of transformations is stored. CQRS stands for Command Query Responsibility Segregation. It is a concept that can be tightly related to event sourcing.

What is Event Sourcing useful for?

Event Sourcing ensures that all changes to application state are stored as a sequence of events. Not just can we query these events, we can also use the event log to reconstruct past states, and as a foundation to automatically adjust the state to cope with retroactive changes.

Should you use Event Sourcing?

Why Use Event Sourcing And you probably won’t describe the exact state of the world at time X. Similarly, a domain expert will probably talk about a series of events when describing a process. When you use event sourcing, it becomes easier to model this in your system.

Is Event Sourcing Event-Driven?

Event Sourcing is Event-driven Architecture taken all the way to the storage level. Event-driven Architecture can be implemented without doing Event Sourcing, but a system using Event Sourcing would by definition exemplify a form of Event-driven Architecture.

What happens to history when Event Sourcing is used?

Unless there’s an additional auditing mechanism that records the details of each operation in a separate log, history is lost. The Event Sourcing pattern defines an approach to handling operations on data that’s driven by a sequence of events, each of which is recorded in an append-only store.

What is event sourcing-based business logic?

Event sourcing-based business logic consists of loosely coupled business entities that exchange events. This makes it a lot easier to migrate from a monolithic application to a microservice architecture. It is a different and unfamiliar style of programming and so there is a learning curve.

What is Event Sourcing in Salesforce?

Event Sourcing ensures that all changes to application state are stored as a sequence of events. Not just can we query these events, we can also use the event log to reconstruct past states, and as a foundation to automatically adjust the state to cope with retroactive changes.

How to implement Event Sourcing with CQRS?

Event sourcing is commonly combined with the CQRS pattern by performing the data management tasks in response to the events, and by materializing views from the stored events. Consider the following points when deciding how to implement this pattern: