Chris Richardson, Functional Domain Models with Event Sourcing, SF Scala @Sungevity 201502

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Event sourcing persists each entity as a sequence of state changing event. An entity’s current state is derived by replaying the events. Event sourcing is a great way to implement event-driven micro services. When one service updates an entity, the new events are consumed by other services, which then update their own state.

In this talk we describe how to implement business logic using event sourcing. You will learn how to write functional, immutable domain models in Scala. We will compare and contrast a hybrid OO/FP design with a purely functional approach.