jakarta.persistence.PessimisticLockScope Maven / Gradle / Ivy
/*
* Copyright (c) 2008, 2023 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Linda DeMichiel - 2.1
// Linda DeMichiel - 2.0
package jakarta.persistence;
/**
*
* Defines the values of the {@code jakarta.persistence.lock.scope}
* property for pessimistic locking. This property may be passed as an
* argument to the methods of the {@link EntityManager}, {@link Query},
* and {@link TypedQuery} interfaces that allow lock modes to be specified
* or used with the {@link NamedQuery} annotation.
*
* @since 2.0
*/
public enum PessimisticLockScope implements FindOption, RefreshOption, LockOption {
/**
* This value defines the default behavior for pessimistic locking.
*
* The persistence provider must lock the database row(s) that
* correspond to the non-collection-valued persistent state of
* that instance. If a joined inheritance strategy is used, or if
* the entity is otherwise mapped to a secondary table, this
* entails locking the row(s) for the entity instance in the
* additional table(s). Entity relationships for which the locked
* entity contains the foreign key will also be locked, but not
* the state of the referenced entities (unless those entities are
* explicitly locked). Element collections and relationships for
* which the entity does not contain the foreign key (such as
* relationships that are mapped to join tables or unidirectional
* one-to-many relationships for which the target entity contains
* the foreign key) will not be locked by default.
*/
NORMAL,
/**
* In addition to the locking behavior specified for {@link #NORMAL},
* element collections and relationships owned by the entity that
* are contained in join tables are locked if the property
* {@code jakarta.persistence.lock.scope} is specified with a value
* of {@code PessimisticLockScope#EXTENDED}. The state of entities
* referenced by such relationships is not locked (unless those
* entities are explicitly locked). Locking such a relationship or
* element collection generally locks only the rows in the join table
* or collection table for that relationship or collection. This means
* that phantoms are possible.
*/
EXTENDED
}