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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate;
import jakarta.persistence.EntityGraph;
import org.hibernate.graph.GraphSemantic;
/**
* A command-oriented API often used for performing bulk operations against
* the database. A stateless session has no persistence context, and always
* works directly with detached entity instances. When a method of this
* interface is called, any necessary interaction with the database happens
* immediately and synchronously.
*
* Viewed in opposition to {@link Session}, the {@code StatelessSession} is
* a whole competing programming model, one preferred by some developers
* for its simplicity and somewhat lower level of abstraction. But the two
* kinds of session are not enemies, and may comfortably coexist in a single
* program.
*
* A stateless session comes some with designed-in limitations:
*
* - it does not have a first-level cache,
*
- nor interact with any second-level cache,
*
- nor does it implement transactional write-behind or automatic dirty
* checking, and
*
- nor do operations cascade to associated instances.
*
*
* Furthermore:
*
* - collections are completely ignored by a stateless session, and
*
- operations performed via a stateless session bypass Hibernate's event
* model, lifecycle callbacks, and interceptors.
*
*
* Stateless sessions are vulnerable to data aliasing effects, due to the
* lack of a first-level cache.
*
* On the other hand, for certain kinds of transactions, a stateless session
* may perform slightly faster than a stateful session.
*
* @author Gavin King
*/
public interface StatelessSession extends SharedSessionContract {
/**
* Close the stateless session and release the JDBC connection.
*/
void close();
/**
* Insert a row.
*
* @param entity a new transient instance
*
* @return The identifier of the inserted entity
*/
Object insert(Object entity);
/**
* Insert a row.
*
* @param entityName The entityName for the entity to be inserted
* @param entity a new transient instance
*
* @return the identifier of the instance
*/
Object insert(String entityName, Object entity);
/**
* Update a row.
*
* @param entity a detached entity instance
*/
void update(Object entity);
/**
* Update a row.
*
* @param entityName The entityName for the entity to be updated
* @param entity a detached entity instance
*/
void update(String entityName, Object entity);
/**
* Delete a row.
*
* @param entity a detached entity instance
*/
void delete(Object entity);
/**
* Delete a row.
*
* @param entityName The entityName for the entity to be deleted
* @param entity a detached entity instance
*/
void delete(String entityName, Object entity);
/**
* Use a SQL {@code merge into} statement to perform an upsert.
*
* @param entity a detached entity instance
* @throws TransientObjectException is the entity is transient
*
* @since 6.3
*/
@Incubating
void upsert(Object entity);
/**
* Use a SQL {@code merge into} statement to perform an upsert.
*
* @param entityName The entityName for the entity to be merged
* @param entity a detached entity instance
* @throws TransientObjectException is the entity is transient
*
* @since 6.3
*/
@Incubating
void upsert(String entityName, Object entity);
/**
* Retrieve a row.
*
* @param entityName The name of the entity to retrieve
* @param id The id of the entity to retrieve
*
* @return a detached entity instance
*/
Object get(String entityName, Object id);
/**
* Retrieve a row.
*
* @param entityClass The class of the entity to retrieve
* @param id The id of the entity to retrieve
*
* @return a detached entity instance
*/
T get(Class entityClass, Object id);
/**
* Retrieve a row, obtaining the specified lock mode.
*
* @param entityName The name of the entity to retrieve
* @param id The id of the entity to retrieve
* @param lockMode The lock mode to apply to the entity
*
* @return a detached entity instance
*/
Object get(String entityName, Object id, LockMode lockMode);
/**
* Retrieve a row, obtaining the specified lock mode.
*
* @param entityClass The class of the entity to retrieve
* @param id The id of the entity to retrieve
* @param lockMode The lock mode to apply to the entity
*
* @return a detached entity instance
*/
T get(Class entityClass, Object id, LockMode lockMode);
/**
* Retrieve a row, fetching associations specified by the
* given {@link EntityGraph}.
*
* @param graph The {@link EntityGraph}
* @param graphSemantic a {@link GraphSemantic} specifying
* how the graph should be interpreted
* @param id The id of the entity to retrieve
*
* @return a detached entity instance
*
* @since 6.3
*/
T get(EntityGraph graph, GraphSemantic graphSemantic, Object id);
/**
* Retrieve a row, fetching associations specified by the
* given {@link EntityGraph}, and obtaining the specified
* lock mode.
*
* @param graph The {@link EntityGraph}
* @param graphSemantic a {@link GraphSemantic} specifying
* how the graph should be interpreted
* @param id The id of the entity to retrieve
* @param lockMode The lock mode to apply to the entity
*
* @return a detached entity instance
*
* @since 6.3
*/
T get(EntityGraph graph, GraphSemantic graphSemantic, Object id, LockMode lockMode);
/**
* Refresh the entity instance state from the database.
*
* @param entity The entity to be refreshed.
*/
void refresh(Object entity);
/**
* Refresh the entity instance state from the database.
*
* @param entityName The entityName for the entity to be refreshed.
* @param entity The entity to be refreshed.
*/
void refresh(String entityName, Object entity);
/**
* Refresh the entity instance state from the database.
*
* @param entity The entity to be refreshed.
* @param lockMode The LockMode to be applied.
*/
void refresh(Object entity, LockMode lockMode);
/**
* Refresh the entity instance state from the database.
*
* @param entityName The entityName for the entity to be refreshed.
* @param entity The entity to be refreshed.
* @param lockMode The LockMode to be applied.
*/
void refresh(String entityName, Object entity, LockMode lockMode);
/**
* Fetch an association that's configured for lazy loading.
*
* Warning: this operation in a stateless session is quite sensitive
* to data aliasing effects and should be used with great care.
*
* @param association a lazy-loaded association
*
* @see org.hibernate.Hibernate#initialize(Object)
*
* @since 6.0
*/
void fetch(Object association);
}