Spring DI and AOP

PatientService, ConceptService, etc are interfaces. PatientServiceImpl, ConceptServiceImpl, etc are the current default implementations of those interfaces. Which implementation Context serves up is determined by Spring's dependency injection. Each *Impl contains a reference to its DAO (PatientDAO, ConceptDAO etc). The DAOs are also interfaces. The current default implementation of them are for Hibernate (HibernatePatientDAO, HibernateConceptDAO, etc). Which DAO implementation is used at runtime is also determined by Spring's DI.

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