Appendix A: Aggregates and Event Sourcing: A+ES
Event Sourcing is an important technical approach to persisting Aggregates that also provides the basis for developing an Event-Driven Architecture. Event Sourcing can be used to represent the entire state of an Aggregate as a sequence of Events that have occurred since it was created. The Events are used to rebuild the state of the Aggregate by replaying them in the same order in which they occurred. The premise is that this approach simplifies persistence and allows capturing concepts with complex behavioral properties, besides the far-reaching influence the Events themselves can have on your own and external systems.
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