001 /*
002 * JBoss DNA (http://www.jboss.org/dna)
003 * See the COPYRIGHT.txt file distributed with this work for information
004 * regarding copyright ownership. Some portions may be licensed
005 * to Red Hat, Inc. under one or more contributor license agreements.
006 * See the AUTHORS.txt file in the distribution for a full listing of
007 * individual contributors.
008 *
009 * JBoss DNA is free software. Unless otherwise indicated, all code in JBoss DNA
010 * is licensed to you under the terms of the GNU Lesser General Public License as
011 * published by the Free Software Foundation; either version 2.1 of
012 * the License, or (at your option) any later version.
013 *
014 * JBoss DNA is distributed in the hope that it will be useful,
015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
017 * Lesser General Public License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this software; if not, write to the Free
021 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
022 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
023 */
024 package org.jboss.dna.common.jdbc.provider;
025
026 import java.sql.Connection;
027 import javax.naming.InitialContext;
028 import javax.sql.DataSource;
029
030 /**
031 * Default DataSource based DatabaseMetadataProvider
032 *
033 * @author <a href="mailto:litsenko_sergey@yahoo.com">Sergiy Litsenko</a>
034 */
035 public class DefaultDataSourceDatabaseMetadataProvider extends DefaultDatabaseMetadataProvider
036 implements DataSourceDatabaseMetadataProvider {
037 // ~ Instance fields ------------------------------------------------------------------
038
039 private static final long serialVersionUID = -405855619877872933L;
040 private String dataSourceName;
041 private DataSource dataSource;
042
043 // ~ Constructors ---------------------------------------------------------------------
044
045 /**
046 * Default Constructor
047 */
048 public DefaultDataSourceDatabaseMetadataProvider() {
049 }
050
051 /**
052 * Constructor
053 *
054 * @param name the DatabaseMetadataProvider logical name
055 */
056 public DefaultDataSourceDatabaseMetadataProvider( String name ) {
057 super(name);
058 }
059
060 // ~ Methods --------------------------------------------------------------------------
061
062 /**
063 * Opens new database connection based on suppied parameters
064 *
065 * @return new database connection based on suppied parameters
066 * @throws Exception
067 */
068 @Override
069 protected Connection openConnection() throws Exception {
070 // log debug info
071 if (log.isDebugEnabled()) {
072 log.debug("Opening database connection from data source " + getDataSourceName());
073 }
074
075 // loads connection from data source
076 return getDataSource().getConnection();
077 }
078
079 /**
080 * Returns DataSource
081 *
082 * @return DataSource
083 * @throws Exception
084 */
085 public DataSource getDataSource() throws Exception {
086 // lazy load data source
087 if (dataSource == null) {
088 // log debug info
089 if (log.isDebugEnabled()) {
090 log.debug("Creating JNDI initial context with following properties: " + getProperties());
091 }
092
093 // create initial context using properties if any
094 InitialContext initialContext = new InitialContext(getProperties());
095
096 try {
097 // log debug info
098 if (log.isDebugEnabled()) {
099 log.debug("Performing JNDI lookup for data source " + getDataSourceName());
100 }
101
102 // lookups datasource
103 dataSource = (DataSource)initialContext.lookup(getDataSourceName());
104 } finally {
105 // close context
106 initialContext.close();
107 }
108 }
109
110 // return
111 return dataSource;
112 }
113
114 /**
115 * Sets data source JNDI name
116 *
117 * @return data source JNDI name
118 */
119 public String getDataSourceName() {
120 // return
121 return dataSourceName;
122 }
123
124 /**
125 * Sets data source JNDI name
126 *
127 * @param dataSourceName the data source JNDI name
128 */
129 public void setDataSourceName( String dataSourceName ) {
130 this.dataSourceName = dataSourceName;
131 }
132 }