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Building Applications with Spring 5 and Vue.js 2
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UserService
that RegistrationApiController
depends on is very thin because its responsibility only includes the following:
Most importantly, its responsibility should not involve any business logic. Business logic should only live in the domain models. Figure 9.11 shows the relationship between UserService
and its dependencies:
Figure 9.11: UserService class diagram
As you can see, the implementation of UserService
, which is UserServiceImpl
, relies on RegistrationService
, which is a Domain Service to handle the actual registration. It also relies on MailManager
to send email and DomainEventPublisher
to publish the UserRegisteredEvent
domain event.
As mentioned, Application Services should be kept thin. They can hold references to their dependencies, such as Repositories, Domain Services, and Infrastructure...