/*
* Copyright (C) 2011 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.services.jdbc.impl;
import org.exoplatform.commons.utils.PrivilegedSystemHelper;
import org.exoplatform.commons.utils.PropertyManager;
import org.exoplatform.services.log.ExoLogger;
import org.exoplatform.services.log.Log;
import java.io.PrintWriter;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Logger;
import javax.sql.DataSource;
/**
* This class is used to wrap the original {@link DataSource}
* in order to be able to support close operation.
*
* @author <a href="abazko@exoplatform.com">Anatoliy Bazko</a>
* @version $Id$
*/
public class CloseableDataSource implements DataSource
{
/**
* The wrapped {@link DataSource}
*/
private DataSource ds;
/**
* Flag which is set to true if we closed DataSource.
*/
private final AtomicBoolean closed = new AtomicBoolean(false);
/**
* Exception instance for logging of call stack which called a closing of DataSource.
* Need for finding where exists usage of closed sessions.
*/
private Exception closedByCallStack;
private static final Log log = ExoLogger.getLogger("exo.kernel.component.common.CloseableDataSource");
/**
* Property value which responsible for allowing of closed DataSource usage.
*/
private static final boolean PROHIBIT_CLOSED_DATASOURCE_USAGE = Boolean.valueOf(PrivilegedSystemHelper.getProperty(
"exo.jcr.prohibit.closed.datasource.usage", "true"));
/**
* Constructor CloseableDataSource.
*/
public CloseableDataSource(DataSource ds)
{
this.ds = ds;
}
/**
* {@inheritDoc}
*/
public PrintWriter getLogWriter() throws SQLException
{
checkValid();
return ds.getLogWriter();
}
/**
* {@inheritDoc}
*/
public int getLoginTimeout() throws SQLException
{
checkValid();
return ds.getLoginTimeout();
}
/**
* {@inheritDoc}
*/
public void setLogWriter(PrintWriter out) throws SQLException
{
checkValid();
ds.setLogWriter(out);
}
/**
* {@inheritDoc}
*/
public void setLoginTimeout(int seconds) throws SQLException
{
checkValid();
ds.setLoginTimeout(seconds);
}
/**
* {@inheritDoc}
*/
public boolean isWrapperFor(Class<?> iface) throws SQLException
{
checkValid();
return ds.isWrapperFor(iface);
}
/**
* {@inheritDoc}
*/
public <T> T unwrap(Class<T> iface) throws SQLException
{
checkValid();
return ds.unwrap(iface);
}
/**
* {@inheritDoc}
*/
public Connection getConnection() throws SQLException
{
checkValid();
return ds.getConnection();
}
/**
* {@inheritDoc}
*/
public Connection getConnection(String username, String password) throws SQLException
{
checkValid();
return ds.getConnection(username, password);
}
/**
* Closes datasource to release all idle connections.
*/
public void close()
{
closed.set(true);
if (PROHIBIT_CLOSED_DATASOURCE_USAGE)
{
ds = null;
}
if (PROHIBIT_CLOSED_DATASOURCE_USAGE || PropertyManager.isDevelopping())
{
this.closedByCallStack = new Exception("The datasource has been closed by the following call stack");
}
}
/**
* Check if datasouce already closed.
*
* @throws SQLException
* if datasource is closed
*/
private void checkValid() throws SQLException
{
if (closed.get())
{
if (ds == null)
{
throw new SQLException("The datasource is closed", closedByCallStack);
}
else if (PropertyManager.isDevelopping())
{
log.warn("This kind of operation is forbidden after a DataSource closed, "
+ "please note that an exception will be raised in the next jcr version.", new Exception(
closedByCallStack));
}
}
}
/**
* @see javax.sql.CommonDataSource#getParentLogger()
*/
public Logger getParentLogger() throws SQLFeatureNotSupportedException
{
try
{
checkValid();
Method m = ds.getClass().getMethod("getParentLogger");
return (Logger)m.invoke(ds);
}
catch (Exception e)
{
throw new SQLFeatureNotSupportedException(e);
}
}
}