Entity intercepting
EntityInterceptor
By default JpaRepository and BasicRepository (legacy) interfaces have their save and delete methods intercepted.
Any module can then provide an EntityInterceptor bean that executes code before or after the entity state is being updated.
Note that the EntityInterceptor listens to the repository calls and does not take into account when the actual session flushing happens (which might be at a later point in time).
All beans implementing EntityInterceptor will automatically be detected after their owning module has bootstrapped.
All regular Across bean ordering options apply to entity interceptors.
If you are interested in only implementing part of the EntityInterceptor interface you can use the EntityInterceptorAdapter.
public class MyInterceptor extends EntityInterceptorAdapter<MyEntity>
{
@Override
public boolean handles( Class<?> entityClass ) {
return MyEntity.class.equals( entityClass );
}
@Override
public void afterCreate( MyEntity entity ) {
System.out.println( "A new entity has just been created!" );
}
}
Entity intercepting of Spring data JPA Repositories is only activated if they were created using the custom EntityInterceptingJpaRepositoryFactoryBean.
If you did not activate JPA repositories using the specific @EnableAcrossJpaRepositories, you might have to specify the factory bean class manually.
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Known limitations
Persistable entities only
Currently JpaRepository methods are only intercepted if they manage a Persistable entity.
Reason for this is the use of the isNew method to determine a create or update event.
Entities extending SettableIdBasedEntity automatically implement the required interface.
Transactional behaviour
The EntityInterceptor calls happen in the same transaction as the repository method.
If no outer transaction is busy yet, a new one will be created that wraps calls like beforeCreate, afterCreate and the repository method.
The transaction manager used is the transaction manager declared in the @EnableAcrossJpaRepositories definition.
| When using multiple JPA modules with entity intercepting enabled, only a single transaction scope will kept. You should pay special attention to avoid transactional issues. |
Custom save/delete methods and recursive calls
The JpaRepositoryInterceptor implementation used intercepts only the known JpaRepository methods.
If for some reason you decide to create your own save or delete methods, these will not be intercepted.
Likewise calling any save or delete method from within the repository will not trigger them to be intercepted.
This is due to the standard proxy behaviour.