cloud.piranha.extension.eclipselink.TxEntityManagerHolder Maven / Gradle / Ivy
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package cloud.piranha.extension.eclipselink;
import java.io.Serializable;
import java.util.function.Supplier;
import jakarta.persistence.EntityManager;
import jakarta.transaction.TransactionScoped;
/**
* Bean to store the entity manager during a transaction.
*
*
* This should always hold the transactional entity manager, as the
* non-transactional one should be hold in a request scoped bean.
*
* @author Arjan Tijms
*
*/
@TransactionScoped
public class TxEntityManagerHolder implements Serializable {
private static final long serialVersionUID = 1L;
/**
* The entity manager that we store for the duration of a transaction
*/
private EntityManager entityManager;
/**
* Gets the entity manager or computes and stores it if not yet available.
*
* @param entityManagerSupplier the supplier to get the entity manager from
* @return the new or previously stored entity manager
*/
public EntityManager computeIfAbsent(Supplier entityManagerSupplier) {
if (entityManager == null) {
entityManager = entityManagerSupplier.get();
}
return entityManager;
}
}