/*
 * 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.engine.spi.EntityEntry;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.persister.entity.Lockable;

A pessimistic locking strategy that increments the version immediately (obtaining an exclusive write lock).

This strategy is valid for LockMode.PESSIMISTIC_FORCE_INCREMENT
Author:Scott Marlow
Since:3.5
/** * A pessimistic locking strategy that increments the version immediately (obtaining an exclusive write lock). * <p/> * This strategy is valid for LockMode.PESSIMISTIC_FORCE_INCREMENT * * @author Scott Marlow * @since 3.5 */
public class PessimisticForceIncrementLockingStrategy 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 PessimisticForceIncrementLockingStrategy(Lockable lockable, LockMode lockMode) { this.lockable = lockable; this.lockMode = lockMode; // ForceIncrement can be used for PESSIMISTIC_READ, PESSIMISTIC_WRITE or PESSIMISTIC_FORCE_INCREMENT if ( lockMode.lessThan( LockMode.PESSIMISTIC_READ ) ) { 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 HibernateException( "[" + lockMode + "] not supported for non-versioned entities [" + lockable.getEntityName() + "]" ); } final EntityEntry entry = session.getPersistenceContext().getEntry( object ); final EntityPersister persister = entry.getPersister(); final Object nextVersion = persister.forceVersionIncrement( entry.getId(), entry.getVersion(), session ); entry.forceLocked( object, nextVersion ); }
Retrieve the specific lock mode defined.
Returns:The specific lock mode.
/** * Retrieve the specific lock mode defined. * * @return The specific lock mode. */
protected LockMode getLockMode() { return lockMode; } }