/*
 * 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.id;

import java.io.Serializable;
import java.util.Properties;

import org.hibernate.MappingException;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.id.enhanced.AccessCallback;
import org.hibernate.id.enhanced.LegacyHiLoAlgorithmOptimizer;
import org.hibernate.internal.util.config.ConfigurationHelper;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.type.Type;

seqhilo

An IdentifierGenerator that combines a hi/lo algorithm with an underlying oracle-style sequence that generates hi values. The user may specify a maximum lo value to determine how often new hi values are fetched.

Mapping parameters supported: sequence, max_lo, parameters.
Author:Gavin King
Deprecated:See deprecation discussion on SequenceGenerator
/** * <b>seqhilo</b><br> * <br> * An <tt>IdentifierGenerator</tt> that combines a hi/lo algorithm with an underlying * oracle-style sequence that generates hi values. The user may specify a * maximum lo value to determine how often new hi values are fetched.<br> * <br> * Mapping parameters supported: sequence, max_lo, parameters. * * @author Gavin King * * @deprecated See deprecation discussion on {@link SequenceGenerator} */
@Deprecated public class SequenceHiLoGenerator extends SequenceGenerator { public static final String MAX_LO = "max_lo"; private int maxLo; private LegacyHiLoAlgorithmOptimizer hiloOptimizer; @Override public void configure(Type type, Properties params, ServiceRegistry serviceRegistry) throws MappingException { super.configure( type, params, serviceRegistry ); maxLo = ConfigurationHelper.getInt( MAX_LO, params, 9 ); if ( maxLo >= 1 ) { hiloOptimizer = new LegacyHiLoAlgorithmOptimizer( getIdentifierType().getReturnedClass(), maxLo ); } } @Override public synchronized Serializable generate(final SharedSessionContractImplementor session, Object obj) { // maxLo < 1 indicates a hilo generator with no hilo :? if ( maxLo < 1 ) { //keep the behavior consistent even for boundary usages IntegralDataTypeHolder value = null; while ( value == null || value.lt( 0 ) ) { value = super.generateHolder( session ); } return value.makeValue(); } return hiloOptimizer.generate( new AccessCallback() { @Override public IntegralDataTypeHolder getNextValue() { return generateHolder( session ); } @Override public String getTenantIdentifier() { return session.getTenantIdentifier(); } } ); }
For testing/assertion purposes
Returns:The optimizer
/** * For testing/assertion purposes * * @return The optimizer */
LegacyHiLoAlgorithmOptimizer getHiloOptimizer() { return hiloOptimizer; } }