001/*
002 * HA-JDBC: High-Availability JDBC
003 * Copyright (C) 2012  Paul Ferraro
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Lesser General Public License as published by
007 * the Free Software Foundation, either version 3 of the License, or
008 * (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Lesser General Public License for more details.
014 *
015 * You should have received a copy of the GNU Lesser General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018package net.sf.hajdbc.cache.simple;
019
020import java.sql.Connection;
021import java.sql.DatabaseMetaData;
022import java.sql.SQLException;
023
024import net.sf.hajdbc.Database;
025import net.sf.hajdbc.DatabaseCluster;
026import net.sf.hajdbc.DatabaseProperties;
027import net.sf.hajdbc.cache.DatabaseMetaDataCache;
028import net.sf.hajdbc.cache.lazy.LazyDatabaseProperties;
029import net.sf.hajdbc.dialect.Dialect;
030
031/**
032 * DatabaseMetaDataCache implementation that does not cache data.
033 * To be used when memory usage is more of a concern than performance.
034 * 
035 * @author Paul Ferraro
036 * @since 2.0
037 */
038public class SimpleDatabaseMetaDataCache<Z, D extends Database<Z>> implements DatabaseMetaDataCache<Z, D>
039{
040        private final DatabaseCluster<Z, D> cluster;
041
042        public SimpleDatabaseMetaDataCache(DatabaseCluster<Z, D> cluster)
043        {
044                this.cluster = cluster;
045        }
046        
047        /**
048         * @see net.sf.hajdbc.cache.DatabaseMetaDataCache#flush()
049         */
050        @Override
051        public void flush()
052        {
053                // Nothing to flush
054        }
055
056        /**
057         * {@inheritDoc}
058         * @see net.sf.hajdbc.cache.DatabaseMetaDataCache#getDatabaseProperties(net.sf.hajdbc.Database, java.sql.Connection)
059         */
060        @Override
061        public DatabaseProperties getDatabaseProperties(D database, Connection connection) throws SQLException
062        {
063                DatabaseMetaData metaData = connection.getMetaData();
064                Dialect dialect = this.cluster.getDialect();
065                return new LazyDatabaseProperties(new SimpleDatabaseMetaDataProvider(metaData), dialect);
066        }
067}