Spring Data Jpa是否支持存储库继承以及如何做？

Question

I have a simple entity inheritance tree composed of the following:

abstract class Item (id, ...)
class Chart extends Item (...)
class Table extends Item (...)

Each class has its own repository: ItemRepository , ChartRepository and TableRepository . All three repositories are exposed .

Because of domain rules, I need to implement custom logic on delete, as explained here: http://docs.spring.io/spring-data/jpa/docs/1.10.3.RELEASE/reference/html/#repositories.custom-implementations

This custom delete logic concerns all entities in the inheritance tree (the abstract one and the two concretes).

Is there a way to implement custom logic on the ItemRepository and make the repositories of the children entities extend ItemRepository ?

This would avoid duplicate of the same logic for each entity of the inheritance tree. Without that this makes a lot of boilerplate classes :

EntityRepository + EntityRepositoryCustom + EntityRepositoryImpl x 3 entities = 9 classes just to implement 1 ligne of code to be executed on delete...

EDIT

The answer of user user7398104 got me on the way to implement things as explained here and there , but theses resources do not explain how to implement a custom repository on the @NoRepositoryBean base repository. I tried the following without luck:

@NoRepositoryBean
public interface ItemBaseRepository<T extends Item> extends 
    CrudRepository<T, Integer>,
    ItemBaseRepositoryCustom<T>

@RepositoryRestResource
public interface ItemRepository extends ItemBaseRepository<Item> {}

@RepositoryRestResource
public interface ChartRepository extends ItemBaseRepository<Item> {}

@RepositoryRestResource
public interface TableRepository extends ItemBaseRepository<Item> {}

public interface ItemBaseRepositoryCustom<T extends Item> {
    public void delete (T i);
}

public class ItemBaseRepositoryImpl<T extends Item>
    implements ItemBaseRepositoryCustom<T> {

    public void delete (T i) {
        // Custom logic
    }

}

EDIT EDIT

I tried to set @NoRepositoryBean to ItemBaseRepositoryCustom as suggested on comments but it doesnt work either.

Answer 1

You can create ItemRepositoryCustom interface extending the ItemRepository interface, with each chart and table repos extending the ItemRepositoryCustom repo. For this interface you can have a custom implmentation for the delete operation.

EDIT : I just realised that this would not work.

But the following approach would work.

interface CustomItemRepository<T extends Item> extends CrudRepository<T, Long>{ }

interface ChartRepository extends CustomItemRepository<Chart>{ }

interface TableRepository extends CustomItemRepository<Table>{ }

Then you can create a class for delete logic for CustomItemRepository.