Persistence isolation

[froque]

Persistence isolation

Prototype of the needed changes to isolate Persistence specific entities from the business logic.

Proposed structure

billy
└──billy-core
│    Address
│    AddressEntity
└──billy-core-jpa
│    module to be deleted
│      * This removes duplication but the need to have a "duplicate" for each country creates a false sensation that the base can be used by it self
│      * Other reasons...
│    JPAAddressEntity
└──billy-portugal
│    PTAddress
│    PTAddressEntity
│    PTAddressBuilder
│    PTAddressDAO
└──billy-portugal-jpa
│    JPAPTAddressEntity
│    JPAPTAddressDAOImpl
└──(billy-portugal-ebean)
       * To be added in the future if needed
     EBPTAddressEntity
     EBPTAddressDAOImpl

History

Billy uses JPA API, but relies heavily on Hibernate and was never tested with any other JPA implementation. There was an effort to also use Ebean (#22), but failed and was removed (#226).