/*
 * 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 <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.dialect.lock;

import java.io.Serializable;

import org.hibernate.HibernateException;
import org.hibernate.LockMode;
import org.hibernate.OptimisticLockException;
import org.hibernate.action.internal.EntityVerifyVersionProcess;
import org.hibernate.engine.spi.EntityEntry;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.event.spi.EventSource;
import org.hibernate.persister.entity.Lockable;

An optimistic locking strategy that verifies that the version hasn't changed (prior to transaction commit).

This strategy is valid for LockMode.OPTIMISTIC
Author:Scott Marlow
Since:3.5
/** * An optimistic locking strategy that verifies that the version hasn't changed (prior to transaction commit). * <p/> * This strategy is valid for LockMode.OPTIMISTIC * * @author Scott Marlow * @since 3.5 */
@SuppressWarnings("deprecation") public class OptimisticLockingStrategy implements LockingStrategy { private final Lockable lockable; private final LockMode lockMode;
Construct locking strategy.
Params:
  • lockable – The metadata for the entity to be locked.
  • lockMode – Indicates the type of lock to be acquired.
/** * Construct locking strategy. * * @param lockable The metadata for the entity to be locked. * @param lockMode Indicates the type of lock to be acquired. */
public OptimisticLockingStrategy(Lockable lockable, LockMode lockMode) { this.lockable = lockable; this.lockMode = lockMode; if ( lockMode.lessThan( LockMode.OPTIMISTIC ) ) { throw new HibernateException( "[" + lockMode + "] not valid for [" + lockable.getEntityName() + "]" ); } } @Override public void lock(Serializable id, Object version, Object object, int timeout, SharedSessionContractImplementor session) { if ( !lockable.isVersioned() ) { throw new OptimisticLockException( object, "[" + lockMode + "] not supported for non-versioned entities [" + lockable.getEntityName() + "]" ); } final EntityEntry entry = session.getPersistenceContext().getEntry( object ); // Register the EntityVerifyVersionProcess action to run just prior to transaction commit. ( (EventSource) session ).getActionQueue().registerProcess( new EntityVerifyVersionProcess( object, entry ) ); } protected LockMode getLockMode() { return lockMode; } }