Java tutorial
/******************************************************************************* * Copyright 2011, 2012 CNES - CENTRE NATIONAL d'ETUDES SPATIALES * * This file is part of SITools2. * * SITools2 is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * SITools2 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with SITools2. If not, see <http://www.gnu.org/licenses/>. ******************************************************************************/ package fr.cnes.sitools.datasource.jdbc.business; import java.util.ArrayList; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; import javax.naming.InitialContext; import javax.naming.NamingException; import javax.sql.DataSource; import org.apache.commons.dbcp.BasicDataSource; import fr.cnes.sitools.datasource.jdbc.model.JDBCDataSource; /** * DataSources configuration / lookup via JNDI * * Use of connection pools ApacheDbcp * * @see http://commons.apache.org/dbcp/guide/jndi-howto.html * * TODO rendre plus parametrable pour que les DataSources puissent tre prcisment crs au demarrage du serveur * Restlet partir de la lecture du fichier de configuration * * @author jp.boignard (AKKA Technologies) * */ public final class SitoolsDataSourceFactory { /** Singleton instance */ private static SitoolsDataSourceFactory instance = null; /** * DataSources list */ private static Map<String, SitoolsDataSource> dataSources = new ConcurrentHashMap<String, SitoolsDataSource>(); /** * Private constructor for utility class */ private SitoolsDataSourceFactory() { super(); } /** * Get an instance of SitoolsDatasource * @return an instance of SitoolsDatasource */ public static synchronized SitoolsDataSourceFactory getInstance() { if (instance == null) { instance = new SitoolsDataSourceFactory(); } return instance; } /** * Local creation of a DataSource * * @param driver * the database driver * @param connectURI * the URI to connect * @param userName * the database user name * @param password * the password * @param schemaOnConnection * the schema on connection * @return SitoolsDataSource a standard data source for SITools */ public SitoolsDataSource setupDataSource(String driver, String connectURI, String userName, String password, String schemaOnConnection) { String key = connectURI + "@" + userName; SitoolsDataSource foundDatasource = dataSources.get(key); if (foundDatasource == null) { BasicDataSource ds = new BasicDataSource(); // OSGi ds.setDriverClassLoader(getClass().getClassLoader()); ds.setDriverClassName(driver); ds.setUsername(userName); ds.setPassword(password); ds.setUrl(connectURI); ds.setMaxActive(10); ds.setInitialSize(1); // ds.setDefaultReadOnly(false); // ds.setDefaultAutoCommit(true); JDBCDataSource jdbcDS = new JDBCDataSource(); jdbcDS.setName(key); jdbcDS.setDriverClass(driver); foundDatasource = new SitoolsDataSource(jdbcDS, ds, schemaOnConnection); dataSources.put(key, foundDatasource); } return foundDatasource; } /** * Setup a dataSource for "users". Usage is for all users for consultation functions. * * @param dataSource * the DataSource to update * @return SitoolsDataSource the new DataSource */ public SitoolsDataSource setupDataSourceForUsers(JDBCDataSource dataSource) { String key = dataSource.getId(); SitoolsDataSource foundDatasource = dataSources.get(key); if (foundDatasource == null) { BasicDataSource ds = new BasicDataSource(); // OSGi ds.setDriverClassLoader(getClass().getClassLoader()); ds.setDriverClassName(dataSource.getDriverClass()); ds.setUsername(dataSource.getUserLogin()); ds.setPassword(dataSource.getUserPassword()); ds.setUrl(dataSource.getUrl()); ds.setMaxActive(dataSource.getMaxActive()); ds.setInitialSize(dataSource.getInitialSize()); ds.setDefaultReadOnly(true); if ((dataSource.getSchemaOnConnection() != null) && !dataSource.getSchemaOnConnection().equals("")) { ds.setDefaultCatalog(dataSource.getSchemaOnConnection()); } foundDatasource = new SitoolsDataSource(dataSource, ds, dataSource.getSchemaOnConnection()); dataSources.put(key, foundDatasource); } return foundDatasource; } /** * removeDataSource * * @param dsName * the name of the DataSource to remove */ public static void removeDataSource(String dsName) { SitoolsDataSource foundDatasource = dataSources.get(dsName); if (foundDatasource != null) { foundDatasource.close(); dataSources.remove(dsName); } } /** * Get the DataSource by name * * @param dsName * the identifier of the DataSource * @return SitoolsDataSource */ public static SitoolsDataSource getDataSource(String dsName) { return dataSources.get(dsName); } /** * Retrieval of a DataSource as a JNDI resource * * Lookup the DataSource, which will be backed by a pool that the application server provides. DataSource instances * are also a good candidate for caching as an instance variable, as JNDI lookups can be expensive as well. * * @param dsName * JNDI resource name * @return DataSource */ public static DataSource getJNDIDataSource(String dsName) { SitoolsDataSource foundDataSource = dataSources.get(dsName); if (foundDataSource != null) { return foundDataSource; } DataSource ds = null; try { InitialContext ctx = new InitialContext(); ds = (DataSource) ctx.lookup(dsName); JDBCDataSource jdbcDS = new JDBCDataSource(); jdbcDS.setName(dsName); dataSources.put(dsName, new SitoolsDataSource(jdbcDS, ds, null)); } catch (NamingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return ds; } /** * Get an array of all DataSources * * @return an Array of DataSource */ public static ArrayList<SitoolsDataSource> getAll() { ArrayList<SitoolsDataSource> result = new ArrayList<SitoolsDataSource>(); for (SitoolsDataSource ds : dataSources.values()) { result.add(ds); } return result; } }