Event Sourcing and CQRS Modeling in Context Mapper

Event sourcing and Command Query Responsibility Segregation (CQRS) are two different approaches, but they work together very well. Both concepts deal with application state. Event sourcing captures all changes to the state as a sequence of (or stream) of events so that state changes can be communicated flexibly without tightly coupling sender and receiver of the change message. This is one reason why this concept is interesting for microservice architectures. CQRS separates query processing from the create, update, delete business logic so that different Non-Functional Requirements (NFRs), for instance regarding performance, for read and write access can be satisfied in different ways. In complex domains, this is often desired.