Microservices Patterns

Chapter 6. Developing business logic with event sourcing

This chapter covers:

• Using the Event sourcing pattern to develop business logic
• Implementing an event store
• Integrating sagas and event sourcing-based business logic
• Implementing saga orchestrators using event sourcing

Mary liked the idea, described in chapter 5, of structuring business logic as a collection of DDD aggregates that publish domain events. She could imagine the use of those events being extremely useful in a microservice architecture. Mary planned to use events to implement choreography-based sagas, which maintain data consistency across services and are described in chapter 4. She also expected to use CQRS views, replicas that support efficient querying that are described ...