alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Hibernate example source code file (SequenceHiLoGenerator.java)

This example Hibernate source code file (SequenceHiLoGenerator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

accesscallback, dialect, integraldatatypeholder, integraldatatypeholder, io, mappingexception, max_lo, max_lo, object, object, properties, sequencegenerator, serializable, serializable, sessionimplementor, util

The Hibernate SequenceHiLoGenerator.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.id;
import java.io.Serializable;
import java.util.Properties;
import org.hibernate.MappingException;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.id.enhanced.AccessCallback;
import org.hibernate.id.enhanced.OptimizerFactory;
import org.hibernate.internal.util.config.ConfigurationHelper;
import org.hibernate.type.Type;

/**
 * <b>seqhilo
* <br> * An <tt>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.<br> * <br> * If sequences are not available, <tt>TableHiLoGenerator might be an * alternative.<br> * <br> * Mapping parameters supported: sequence, max_lo, parameters. * * @see TableHiLoGenerator * @author Gavin King */ public class SequenceHiLoGenerator extends SequenceGenerator { public static final String MAX_LO = "max_lo"; private int maxLo; private OptimizerFactory.LegacyHiLoAlgorithmOptimizer hiloOptimizer; public void configure(Type type, Properties params, Dialect d) throws MappingException { super.configure(type, params, d); maxLo = ConfigurationHelper.getInt( MAX_LO, params, 9 ); if ( maxLo >= 1 ) { hiloOptimizer = new OptimizerFactory.LegacyHiLoAlgorithmOptimizer( getIdentifierType().getReturnedClass(), maxLo ); } } public synchronized Serializable generate(final SessionImplementor 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() { public IntegralDataTypeHolder getNextValue() { return generateHolder( session ); } } ); } /** * For testing/assertion purposes * * @return The optimizer */ OptimizerFactory.LegacyHiLoAlgorithmOptimizer getHiloOptimizer() { return hiloOptimizer; } }

Other Hibernate examples (source code examples)

Here is a short list of links related to this Hibernate SequenceHiLoGenerator.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.