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• PessimisticLockScope.java

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/*
 * Copyright (c) 2008, 2009, 2011 Oracle, Inc. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.  The Eclipse Public License is available
 * at http://www.eclipse.org/legal/epl-v10.html and the Eclipse Distribution License
 * is available at http://www.eclipse.org/org/documents/edl-v10.php.
 */
package javax.persistence;

/**
 * Defines the values of the javax.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 Java Persistence 2.0
 */
public enum PessimisticLockScope {
	/**
	 * 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 behavior for
	 * PessimisticLockScope.NORMAL, element collections
	 * and relationships owned by the entity that are contained in
	 * join tables will be locked if the
	 * javax.persistence.lock.scope property is specified
	 * with a value of PessimisticLockScope.EXTENDED.
	 * The state of entities referenced by such relationships will not
	 * be 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 will be
	 * possible.
	 */
	EXTENDED
}