Package org.flasby.transactions

Interface EntityManagerStore

All Known Implementing Classes:

EntityManagerStoreImpl

public interface EntityManagerStore

Author:

Sebastian Hennebrueder

Method Summary

Modifier and Type	Method	Description
jakarta.persistence.EntityManager	createAndRegister()	Creates an entity manager and stores it in a stack.
jakarta.persistence.EntityManager	get()	Looks for the current entity manager and returns it.
void	unregister(jakarta.persistence.EntityManager entityManager)	Removes an entity manager from the thread local stack.

Method Details

get

jakarta.persistence.EntityManager get()

Looks for the current entity manager and returns it. If no entity manager was found, this method logs a warn message and returns null. This will cause a NullPointerException in most cases and will cause a stack trace starting from your service method.

Returns:

the currently used entity manager or null if none was found

createAndRegister

jakarta.persistence.EntityManager createAndRegister()

Creates an entity manager and stores it in a stack. The use of a stack allows to implement transaction with a 'requires new' behaviour.

Returns:

the created entity manager

unregister

void unregister(jakarta.persistence.EntityManager entityManager)

Removes an entity manager from the thread local stack. It needs to be created using the createAndRegister() method.

Parameters:

entityManager - - the entity manager to remove

Throws:

IllegalStateException - in case the entity manager was not found on the stack