Richer Data History with Event Sourcing
Recorded at SpringOne2GX 2015 Presenter: Steve Pember Groovy Ecosystem Track A common pattern in application development is to build systems where the data is directly linked to the current state of the application; one row in the database equates to one entity’s current state. Only ever knowing the current state of the data is adequate for many systems, but imagine the possibilities if one had access to the state of the data at any point in time. Enter Event Sourcing: instead of persisting the current state of our Domain Objects or Entities, we record historical events about our data. This pattern changes how we persist and process our data, but is surprisingly lightweight. In this talk I will present the basic concepts of Event Sourcing and the positive effects it can have on analytics and performance. We’ll discuss how storing historical events provides extremely powerful views into our data at any point in time. We’ll see how naturally it couples with the Event-oriented world of modern Reactive systems, and how easily it can be implemented in Groovy. We’ll examine some practical use cases and example implementations in Spring Boot. Event Sourcing will change how you think about your data.