/*
* 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.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Properties;
import org.hibernate.HibernateException;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.LockMode;
import org.hibernate.MappingException;
import org.hibernate.cfg.ObjectNameNormalizer;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.engine.jdbc.internal.FormatStyle;
import org.hibernate.engine.jdbc.spi.JdbcServices;
import org.hibernate.engine.jdbc.spi.SqlStatementLogger;
import org.hibernate.id.enhanced.AccessCallback;
import org.hibernate.id.enhanced.OptimizerFactory;
import org.hibernate.internal.util.config.ConfigurationHelper;
import org.hibernate.jdbc.AbstractReturningWork;
import org.hibernate.jdbc.WorkExecutorVisitable;
import org.hibernate.mapping.Table;
import org.hibernate.type.Type;
import org.jboss.logging.Logger;
/**
*
* A hilo <tt>IdentifierGenerator</tt> that returns a <tt>Long</tt>, constructed using
* a hi/lo algorithm. The hi value MUST be fetched in a seperate transaction
* to the <tt>Session</tt> transaction so the generator must be able to obtain
* a new connection and commit it. Hence this implementation may not
* be used when the user is supplying connections. In this
* case a <tt>SequenceHiLoGenerator</tt> would be a better choice (where
* supported).<br>
* <br>
*
* A hilo <tt>IdentifierGenerator</tt> that uses a database
* table to store the last generated values. A table can contains
* several hi values. They are distinct from each other through a key
* <p/>
* <p>This implementation is not compliant with a user connection</p>
* <p/>
*
* <p>Allowed parameters (all of them are optional):</p>
* <ul>
* <li>table: table name (default <tt>hibernate_sequences</tt>)</li>
* <li>primary_key_column: key column name (default <tt>sequence_name</tt>)</li>
* <li>value_column: hi value column name(default <tt>sequence_next_hi_value</tt>)</li>
* <li>primary_key_value: key value for the current entity (default to the entity's primary table name)</li>
* <li>primary_key_length: length of the key column in DB represented as a varchar (default to 255)</li>
* <li>max_lo: max low value before increasing hi (default to Short.MAX_VALUE)</li>
* </ul>
*
* @author Emmanuel Bernard
* @author <a href="mailto:kr@hbt.de">Klaus Richarz</a>.
*/
public class MultipleHiLoPerTableGenerator implements PersistentIdentifierGenerator, Configurable {
private static final CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.class,
MultipleHiLoPerTableGenerator.class.getName());
public static final String ID_TABLE = "table";
public static final String PK_COLUMN_NAME = "primary_key_column";
public static final String PK_VALUE_NAME = "primary_key_value";
public static final String VALUE_COLUMN_NAME = "value_column";
public static final String PK_LENGTH_NAME = "primary_key_length";
private static final int DEFAULT_PK_LENGTH = 255;
public static final String DEFAULT_TABLE = "hibernate_sequences";
private static final String DEFAULT_PK_COLUMN = "sequence_name";
private static final String DEFAULT_VALUE_COLUMN = "sequence_next_hi_value";
private String tableName;
private String pkColumnName;
private String valueColumnName;
private String query;
private String insert;
private String update;
//hilo params
public static final String MAX_LO = "max_lo";
private int maxLo;
private OptimizerFactory.LegacyHiLoAlgorithmOptimizer hiloOptimizer;
private Class returnClass;
private int keySize;
public String[] sqlCreateStrings(Dialect dialect) throws HibernateException {
return new String[] {
new StringBuilder( dialect.getCreateTableString() )
.append( ' ' )
.append( tableName )
.append( " ( " )
.append( pkColumnName )
.append( ' ' )
.append( dialect.getTypeName( Types.VARCHAR, keySize, 0, 0 ) )
.append( ", " )
.append( valueColumnName )
.append( ' ' )
.append( dialect.getTypeName( Types.INTEGER ) )
.append( " ) " )
.toString()
};
}
public String[] sqlDropStrings(Dialect dialect) throws HibernateException {
StringBuffer sqlDropString = new StringBuffer( "drop table " );
if ( dialect.supportsIfExistsBeforeTableName() ) {
sqlDropString.append( "if exists " );
}
sqlDropString.append( tableName ).append( dialect.getCascadeConstraintsString() );
if ( dialect.supportsIfExistsAfterTableName() ) {
sqlDropString.append( " if exists" );
}
return new String[] { sqlDropString.toString() };
}
public Object generatorKey() {
return tableName;
}
public synchronized Serializable generate(final SessionImplementor session, Object obj) {
final WorkExecutorVisitable<IntegralDataTypeHolder> work = new AbstractReturningWork<IntegralDataTypeHolder>() {
@Override
public IntegralDataTypeHolder execute(Connection connection) throws SQLException {
IntegralDataTypeHolder value = IdentifierGeneratorHelper.getIntegralDataTypeHolder( returnClass );
SqlStatementLogger statementLogger = session
.getFactory()
.getServiceRegistry()
.getService( JdbcServices.class )
.getSqlStatementLogger();
int rows;
do {
statementLogger.logStatement( query, FormatStyle.BASIC.getFormatter() );
PreparedStatement qps = connection.prepareStatement( query );
PreparedStatement ips = null;
try {
ResultSet rs = qps.executeQuery();
boolean isInitialized = rs.next();
if ( !isInitialized ) {
value.initialize( 0 );
statementLogger.logStatement( insert, FormatStyle.BASIC.getFormatter() );
ips = connection.prepareStatement( insert );
value.bind( ips, 1 );
ips.execute();
}
else {
value.initialize( rs, 0 );
}
rs.close();
}
catch (SQLException sqle) {
LOG.unableToReadOrInitHiValue(sqle);
throw sqle;
}
finally {
if (ips != null) {
ips.close();
}
qps.close();
}
statementLogger.logStatement( update, FormatStyle.BASIC.getFormatter() );
PreparedStatement ups = connection.prepareStatement( update );
try {
value.copy().increment().bind( ups, 1 );
value.bind( ups, 2 );
rows = ups.executeUpdate();
}
catch (SQLException sqle) {
LOG.error(LOG.unableToUpdateHiValue(tableName), sqle);
throw sqle;
}
finally {
ups.close();
}
} while ( rows==0 );
return value;
}
};
// 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( 1 ) ) {
value = session.getTransactionCoordinator().getTransaction().createIsolationDelegate().delegateWork( work, true );
}
return value.makeValue();
}
return hiloOptimizer.generate(
new AccessCallback() {
public IntegralDataTypeHolder getNextValue() {
return session.getTransactionCoordinator().getTransaction().createIsolationDelegate().delegateWork( work, true );
}
}
);
}
public void configure(Type type, Properties params, Dialect dialect) throws MappingException {
ObjectNameNormalizer normalizer = ( ObjectNameNormalizer ) params.get( IDENTIFIER_NORMALIZER );
tableName = normalizer.normalizeIdentifierQuoting( ConfigurationHelper.getString( ID_TABLE, params, DEFAULT_TABLE ) );
if ( tableName.indexOf( '.' ) < 0 ) {
tableName = dialect.quote( tableName );
final String schemaName = dialect.quote(
normalizer.normalizeIdentifierQuoting( params.getProperty( SCHEMA ) )
);
final String catalogName = dialect.quote(
normalizer.normalizeIdentifierQuoting( params.getProperty( CATALOG ) )
);
tableName = Table.qualify( catalogName, schemaName, tableName );
}
else {
// if already qualified there is not much we can do in a portable manner so we pass it
// through and assume the user has set up the name correctly.
}
pkColumnName = dialect.quote(
normalizer.normalizeIdentifierQuoting(
ConfigurationHelper.getString( PK_COLUMN_NAME, params, DEFAULT_PK_COLUMN )
)
);
valueColumnName = dialect.quote(
normalizer.normalizeIdentifierQuoting(
ConfigurationHelper.getString( VALUE_COLUMN_NAME, params, DEFAULT_VALUE_COLUMN )
)
);
keySize = ConfigurationHelper.getInt(PK_LENGTH_NAME, params, DEFAULT_PK_LENGTH);
String keyValue = ConfigurationHelper.getString(PK_VALUE_NAME, params, params.getProperty(TABLE) );
query = "select " +
valueColumnName +
" from " +
dialect.appendLockHint( LockMode.PESSIMISTIC_WRITE, tableName ) +
" where " + pkColumnName + " = '" + keyValue + "'" +
dialect.getForUpdateString();
update = "update " +
tableName +
" set " +
valueColumnName +
" = ? where " +
valueColumnName +
" = ? and " +
pkColumnName +
" = '" +
keyValue
+ "'";
insert = "insert into " + tableName +
"(" + pkColumnName + ", " + valueColumnName + ") " +
"values('"+ keyValue +"', ?)";
//hilo config
maxLo = ConfigurationHelper.getInt(MAX_LO, params, Short.MAX_VALUE);
returnClass = type.getReturnedClass();
if ( maxLo >= 1 ) {
hiloOptimizer = new OptimizerFactory.LegacyHiLoAlgorithmOptimizer( returnClass, maxLo );
}
}
}