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The application is written in Java, and uses Spring Boot. ExampleĬustomers and Orders is an example of an application that is built using Event Sourcing and CQRS. To reconstruct the current state, the application finds the most recent snapshot and the events that have occurred since that snapshot.Īs a result, there are fewer events to replay. In order to optimize loading, an application can periodically save a snapshot of an entity’s current state. Some entities, such as a Customer, can have a large number of events. When a service saves an event in the event store, it is delivered to all interested subscribers. It provides an API that enables services to subscribe to events. The event store also behaves like a message broker. The store has an API for adding and retrieving an entity’s events. The application reconstructs an entity’s current state by replaying the events.Īpplications persist events in an event store, which is a database of events. Since saving an event is a single operation, it is inherently atomic. ![]() ![]() Whenever the state of a business entity changes, a new event is appended to the list of events. #AFTER HELP INCIDENT GITHUB DMCA PROCESS UPDATE#This ordering must be preserved across multiple service instances that update the same aggregate.Ī good solution to this problem is to use event sourcing.Įvent sourcing persists the state of a business entity such an Order or a Customer as a sequence of state-changing events.
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