Java tutorial
package org.apache.torque.dsfactory; /* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ import javax.sql.ConnectionPoolDataSource; import javax.sql.DataSource; import org.apache.commons.configuration.Configuration; import org.apache.commons.dbcp.datasources.PerUserPoolDataSource; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.torque.Torque; import org.apache.torque.TorqueException; /** * A factory that looks up the DataSource using the JDBC2 pool methods. * * @author <a href="mailto:jmcnally@apache.org">John McNally</a> * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> * @version $Id: PerUserPoolDataSourceFactory.java 1336091 2012-05-09 11:09:40Z tfischer $ */ public class PerUserPoolDataSourceFactory extends AbstractDataSourceFactory { /** The log. */ private static Log log = LogFactory.getLog(PerUserPoolDataSourceFactory.class); /** The wrapped <code>DataSource</code>. */ private PerUserPoolDataSource ds = null; /** * @see org.apache.torque.dsfactory.DataSourceFactory#getDataSource */ public DataSource getDataSource() { return ds; } /** * @see org.apache.torque.dsfactory.DataSourceFactory#initialize */ public void initialize(Configuration configuration) throws TorqueException { ConnectionPoolDataSource cpds = initCPDS(configuration); PerUserPoolDataSource dataSource = initJdbc2Pool(configuration); dataSource.setConnectionPoolDataSource(cpds); this.ds = dataSource; } /** * Initializes the Jdbc2PoolDataSource. * * @param configuration where to read the settings from * @throws TorqueException if a property set fails * @return a configured <code>Jdbc2PoolDataSource</code> */ private PerUserPoolDataSource initJdbc2Pool(Configuration configuration) throws TorqueException { log.debug("Starting initJdbc2Pool"); PerUserPoolDataSource dataSource = new PerUserPoolDataSource(); Configuration c = Torque.getConfiguration(); if (c == null || c.isEmpty()) { log.warn("Global Configuration not set," + " no Default pool data source configured!"); } else { Configuration conf = c.subset(DEFAULT_POOL_KEY); applyConfiguration(conf, dataSource); } Configuration conf = configuration.subset(POOL_KEY); applyConfiguration(conf, dataSource); return dataSource; } /** * Closes the pool associated with this factory and releases it. * @throws TorqueException if the pool cannot be closed properly */ public void close() throws TorqueException { try { ds.close(); } catch (Exception e) { log.error("Exception caught during close()", e); throw new TorqueException(e); } ds = null; } }