CQRS by Example

CQRS and Event Sourcing

As we’ve seen throughout this book, CQRS is a powerful architectural pattern that enables decoupling of the Read and Write Models, in turn maximizing its overall performance — including some benefits such as increased testability, scalability, flexibility, and business-solution orientation. Although we’ve seen how to overcome many caveats, there are some tough challenges left to be resolved optimally. Event Sourcing — or ES — is the next architectural pattern that can help in our journey toward the most scalable solution.

In this chapter, we’ll provide you with a brief introduction to Event Sourcing and discuss how to evolve the concepts we’ve already seen to fit into it. Although Event Sourcing is out of the scope of ...