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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
package org.hibernate.connection;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.hibernate.HibernateException;
import org.hibernate.cfg.Environment;
import org.hibernate.util.PropertiesHelper;
import org.hibernate.util.ReflectHelper;
/**
* A connection provider that uses java.sql.DriverManager. This provider
* also implements a very rudimentary connection pool.
* @see ConnectionProvider
* @author Gavin King
*/
public class DriverManagerConnectionProvider implements ConnectionProvider {
private String url;
private Properties connectionProps;
private Integer isolation;
private final ArrayList pool = new ArrayList();
private int poolSize;
private int checkedOut = 0;
private boolean autocommit;
private static final Logger log = LoggerFactory.getLogger(DriverManagerConnectionProvider.class);
public void configure(Properties props) throws HibernateException {
String driverClass = props.getProperty(Environment.DRIVER);
poolSize = PropertiesHelper.getInt(Environment.POOL_SIZE, props, 20); //default pool size 20
log.info("Using Hibernate built-in connection pool (not for production use!)");
log.info("Hibernate connection pool size: " + poolSize);
autocommit = PropertiesHelper.getBoolean(Environment.AUTOCOMMIT, props);
log.info("autocommit mode: " + autocommit);
isolation = PropertiesHelper.getInteger(Environment.ISOLATION, props);
if (isolation!=null)
log.info( "JDBC isolation level: " + Environment.isolationLevelToString( isolation.intValue() ) );
if (driverClass==null) {
log.warn("no JDBC Driver class was specified by property " + Environment.DRIVER);
}
else {
try {
// trying via forName() first to be as close to DriverManager's semantics
Class.forName(driverClass);
}
catch (ClassNotFoundException cnfe) {
try {
ReflectHelper.classForName(driverClass);
}
catch (ClassNotFoundException e) {
String msg = "JDBC Driver class not found: " + driverClass;
log.error( msg, e );
throw new HibernateException(msg, e);
}
}
}
url = props.getProperty( Environment.URL );
if ( url == null ) {
String msg = "JDBC URL was not specified by property " + Environment.URL;
log.error( msg );
throw new HibernateException( msg );
}
connectionProps = ConnectionProviderFactory.getConnectionProperties( props );
log.info( "using driver: " + driverClass + " at URL: " + url );
// if debug level is enabled, then log the password, otherwise mask it
if ( log.isDebugEnabled() ) {
log.info( "connection properties: " + connectionProps );
}
else if ( log.isInfoEnabled() ) {
log.info( "connection properties: " + PropertiesHelper.maskOut(connectionProps, "password") );
}
}
public Connection getConnection() throws SQLException {
if ( log.isTraceEnabled() ) log.trace( "total checked-out connections: " + checkedOut );
synchronized (pool) {
if ( !pool.isEmpty() ) {
int last = pool.size() - 1;
if ( log.isTraceEnabled() ) {
log.trace("using pooled JDBC connection, pool size: " + last);
checkedOut++;
}
Connection pooled = (Connection) pool.remove(last);
if (isolation!=null) pooled.setTransactionIsolation( isolation.intValue() );
if ( pooled.getAutoCommit()!=autocommit ) pooled.setAutoCommit(autocommit);
return pooled;
}
}
log.debug("opening new JDBC connection");
Connection conn = DriverManager.getConnection(url, connectionProps);
if (isolation!=null) conn.setTransactionIsolation( isolation.intValue() );
if ( conn.getAutoCommit()!=autocommit ) conn.setAutoCommit(autocommit);
if ( log.isDebugEnabled() ) {
log.debug( "created connection to: " + url + ", Isolation Level: " + conn.getTransactionIsolation() );
}
if ( log.isTraceEnabled() ) checkedOut++;
return conn;
}
public void closeConnection(Connection conn) throws SQLException {
if ( log.isDebugEnabled() ) checkedOut--;
synchronized (pool) {
int currentSize = pool.size();
if ( currentSize < poolSize ) {
if ( log.isTraceEnabled() ) log.trace("returning connection to pool, pool size: " + (currentSize + 1) );
pool.add(conn);
return;
}
}
log.debug("closing JDBC connection");
conn.close();
}
protected void finalize() {
close();
}
public void close() {
log.info("cleaning up connection pool: " + url);
Iterator iter = pool.iterator();
while ( iter.hasNext() ) {
try {
( (Connection) iter.next() ).close();
}
catch (SQLException sqle) {
log.warn("problem closing pooled connection", sqle);
}
}
pool.clear();
}
/**
* @see ConnectionProvider#supportsAggressiveRelease()
*/
public boolean supportsAggressiveRelease() {
return false;
}
}