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From Domain-Driven Design (DDD).
A service often needs to publish events when it updates its data. These events might be needed, for example, to update a CQRS view. Alternatively, the service might participate in an choreography-based saga, which uses events for coordination.
How does a service publish an event when it updates its data?
Organize the business logic of a service as a collection of DDD aggregates that emit domain events when they created or updated. The service publishes these domain events so that they can be consumed by other services.
Application architecture patterns
Cross cutting concerns