Java tutorial
package persistence.utils; /* * Copyright 2004 The Apache Software Foundation. * * Licensed 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 org.apache.commons.dbcp.BasicDataSource; import org.apache.commons.dbcp.BasicDataSourceFactory; import org.apache.log4j.Logger; import org.hibernate.HibernateException; import org.hibernate.cfg.Environment; import org.hibernate.connection.ConnectionProvider; import org.hibernate.connection.ConnectionProviderFactory; import java.io.PrintWriter; import java.io.StringWriter; import java.sql.Connection; import java.sql.SQLException; import java.util.Iterator; import java.util.Properties; /** * <p>A connection provider that uses an Apache commons DBCP connection pool.</p> * * <p>To use this connection provider set:<br> * <code>hibernate.connection.provider_class org.hibernate.connection.DBCPConnectionProvider</code></p> * * <pre>Supported Hibernate properties: * hibernate.connection.driver_class * hibernate.connection.url * hibernate.connection.username * hibernate.connection.password * hibernate.connection.isolation * hibernate.connection.autocommit * hibernate.connection.pool_size * hibernate.connection (JDBC driver properties)</pre> * <br> * All DBCP properties are also supported by using the hibernate.dbcp prefix. * A complete list can be found on the DBCP configuration page: * <a href="http://jakarta.apache.org/commons/dbcp/configuration.html">http://jakarta.apache.org/commons/dbcp/configuration.html</a>. * <br> * <pre>Example: * hibernate.connection.provider_class org.hibernate.connection.DBCPConnectionProvider * hibernate.connection.driver_class org.hsqldb.jdbcDriver * hibernate.connection.username sa * hibernate.connection.password * hibernate.connection.url jdbc:hsqldb:test * hibernate.connection.pool_size 20 * hibernate.dbcp.initialSize 10 * hibernate.dbcp.maxWait 3000 * hibernate.dbcp.validationQuery select 1 from dual</pre> * * <p>More information about configuring/using DBCP can be found on the * <a href="http://jakarta.apache.org/commons/dbcp/">DBCP website</a>. * There you will also find the DBCP wiki, mailing lists, issue tracking * and other support facilities</p> * * @see org.hibernate.connection.ConnectionProvider * @author Dirk Verbeeck */ /** * CustomDBCPConnectionProvider, para poder utilizar DBCP con Hibernate. * @author mgoldsman */ public class CustomDBCPConnectionProvider implements ConnectionProvider { //~ Static fields/initializers ----------------------------------------------------------------- /** * Logger for this class */ private static final Logger logger = Logger.getLogger(CustomDBCPConnectionProvider.class); private static final String PREFIX = "hibernate.dbcp."; // Old Environment property for backward-compatibility (property removed in Hibernate3) private static final String DBCP_PS_MAXACTIVE = "hibernate.dbcp.ps.maxActive"; // Property doesn't exists in Hibernate2 private static final String AUTOCOMMIT = "hibernate.connection.autocommit"; //~ Instance fields ---------------------------------------------------------------------------- private BasicDataSource ds; //~ Methods ------------------------------------------------------------------------------------ /** * Cerrar el provider * @throws HibernateException */ public void close() throws HibernateException { if (logger.isDebugEnabled()) { logger.debug("Close CustomDBCPConnectionProvider"); } logStatistics(); try { if (getDs() != null) { getDs().close(); setDs(null); } else { logger.warn("Cannot close DBCP pool (not initialized)"); } } catch (Exception e) { throw new HibernateException("Could not close DBCP pool", e); } if (logger.isDebugEnabled()) { logger.debug("Close CustomDBCPConnectionProvider complete"); } } /** * Cerrar una conection * @param conn * @throws SQLException */ public void closeConnection(Connection conn) throws SQLException { try { conn.close(); } finally { logStatistics(); } } /** * Configuracion de DBCP. * * @param props * @exception HibernateException */ @SuppressWarnings("unchecked") public void configure(Properties props) throws HibernateException { try { if (logger.isDebugEnabled()) { logger.debug("Configure CustomDBCPConnectionProvider"); } // DBCP properties used to create the BasicDataSource Properties dbcpProperties = new Properties(); // si estan seteadas estas propiedades cambio el Properties parametro // por el que me retorna el EncryptManager // TODO reveer // Username / password String username = props.getProperty(Environment.USER); String password = props.getProperty(Environment.PASS); dbcpProperties.put("username", username); dbcpProperties.put("password", password); // DriverClass & url String jdbcDriverClass = props.getProperty(Environment.DRIVER); String jdbcUrl = props.getProperty(Environment.URL); dbcpProperties.put("driverClassName", jdbcDriverClass); dbcpProperties.put("url", jdbcUrl); // Isolation level String isolationLevel = props.getProperty(Environment.ISOLATION); if ((isolationLevel != null) && (isolationLevel.trim().length() > 0)) { dbcpProperties.put("defaultTransactionIsolation", isolationLevel); } // Turn off autocommit (unless autocommit property is set) String autocommit = props.getProperty(AUTOCOMMIT); if ((autocommit != null) && (autocommit.trim().length() > 0)) { dbcpProperties.put("defaultAutoCommit", autocommit); } else { dbcpProperties.put("defaultAutoCommit", String.valueOf(Boolean.FALSE)); } // Pool size String poolSize = props.getProperty(Environment.POOL_SIZE); if ((poolSize != null) && (poolSize.trim().length() > 0) && (Integer.parseInt(poolSize) > 0)) { dbcpProperties.put("maxActive", poolSize); } // Copy all "driver" properties into "connectionProperties" Properties driverProps = ConnectionProviderFactory.getConnectionProperties(props); if (driverProps.size() > 0) { StringBuffer connectionProperties = new StringBuffer(); for (Iterator iter = driverProps.keySet().iterator(); iter.hasNext();) { String key = (String) iter.next(); String value = driverProps.getProperty(key); connectionProperties.append(key).append('=').append(value); if (iter.hasNext()) { connectionProperties.append(';'); } } dbcpProperties.put("connectionProperties", connectionProperties.toString()); } // Copy all DBCP properties removing the prefix for (Iterator iter = props.keySet().iterator(); iter.hasNext();) { String key = String.valueOf(iter.next()); if (key.startsWith(PREFIX)) { String property = key.substring(PREFIX.length()); String value = props.getProperty(key); dbcpProperties.put(property, value); } } // Backward-compatibility if (props.getProperty(DBCP_PS_MAXACTIVE) != null) { dbcpProperties.put("poolPreparedStatements", String.valueOf(Boolean.TRUE)); dbcpProperties.put("maxOpenPreparedStatements", props.getProperty(DBCP_PS_MAXACTIVE)); } // Some debug info if (logger.isDebugEnabled()) { logger.debug("Creating a DBCP BasicDataSource with the following DBCP factory properties:"); StringWriter sw = new StringWriter(); dbcpProperties.list(new PrintWriter(sw, true)); logger.debug(sw.toString()); } // Let the factory create the pool setDs((BasicDataSource) BasicDataSourceFactory.createDataSource(dbcpProperties)); // The BasicDataSource has lazy initialization // borrowing a connection will start the DataSource // and make sure it is configured correctly. Connection conn = getDs().getConnection(); conn.close(); // Log pool statistics before continuing. logStatistics(); } catch (Exception e) { String message = "Could not create a DBCP pool"; logger.fatal(message, e); if (getDs() != null) { try { getDs().close(); } catch (Exception e2) { if (logger.isDebugEnabled()) { logger.debug("Cannot close DBCP pool (not initialized)"); } } setDs(null); } throw new HibernateException(message, e); } if (logger.isDebugEnabled()) { logger.debug("Configure CustomDBCPConnectionProvider complete"); } } /** * Obtener una conection * @return connection * @throws SQLException */ public Connection getConnection() throws SQLException { Connection conn = null; try { conn = getDs().getConnection(); } finally { logStatistics(); } return conn; } /** * Documentacion pendiente. * * @return (documentacion pendiente). */ public boolean supportsAggressiveRelease() { //TODO Solo para cumplir con la interfaz org.hibernate.usertype.UserType return true; } /** * Loguea las estadisticas del pool */ protected void logStatistics() { if (logger.isDebugEnabled()) { logger.debug("active: " + getDs().getNumActive() + " (max: " + getDs().getMaxActive() + ") " + "idle: " + getDs().getNumIdle() + "(max: " + getDs().getMaxIdle() + ")"); } } /** * getDs * @return ds */ private BasicDataSource getDs() { return this.ds; } /** * setDs * @param ds */ private void setDs(BasicDataSource ds) { this.ds = ds; } }