/* * Distributed as part of c3p0 v.0.9.1-pre6 * * Copyright (C) 2005 Machinery For Change, Inc. * * Author: Steve Waldman <swaldman@mchange.com> * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License version 2.1, as  * published by the Free Software Foundation. * * 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; see the file LICENSE.  If not, write to the * Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. */package com.mchange.v2.c3p0;import java.sql.Connection;import java.sql.SQLException;import java.lang.reflect.Method;import java.lang.reflect.InvocationTargetException;/** *  <p><b>Most clients need never use or know about this interface -- c3p0-provided Connections *  can be treated like any other Connection.</b></p> * *  <p>An interface implemented by proxy Connections returned *  by c3p0 PooledDataSources. It provides protected access to the underlying *  dbms-vendor specific Connection, which may be useful if you want to *  access non-standard API offered by your jdbc driver. */public interface C3P0ProxyConnection extends Connection{    /**     *  A token representing an unwrapped, unproxied jdbc Connection     *  for use in {@link #rawConnectionOperation}     */    public final static Object RAW_CONNECTION = new Object();        /**     *  <p>Allows one to work with the unproxied, raw Connection. Some      *  database companies never got over the "common interfaces mean     *  no more vendor lock-in!" thing, and offer non-standard API     *  on their Connections. This method permits you to "pierce" the     *  connection-pooling layer to call non-standard methods on the     *  original Connection, or to pass the original Connections to      *  functions that are not implementation neutral.</p>     *     *  <p>To use this functionality, you'll need to cast a Connection     *  retrieved from a c3p0 PooledDataSource to a      *  C3P0ProxyConnection.</p>     *     *  <p>This method works by making a reflective call of method <tt>m</tt> on     *  Object <tt>target</tt> (which may be null for static methods), passing     *  and argument list <tt>args</tt>. For the method target, or for any argument,     *  you may substitute the special token <tt>C3P0ProxyConnection.RAW_CONNECTION</tt></p>     *     *  <p>Any Statements or ResultSets returned by the operation will be proxied     *  and c3p0-managed, meaning that these resources will be automatically closed      *  if the user does not close them first when this Connection is checked back     *  into the pool. <b>Any other resources returned by the operation are the user's     *  responsibility to clean up!</b></p>     *     *  <p>Incautious use of this method can corrupt the Connection pool, by breaking the invariant     *  that all checked-in Connections should be equivalent. If your vendor supplies API     *  that allows you to modify the state or configuration of a Connection in some nonstandard way,     *  you might use this method to do so, and then check the Connection back into the pool.     *  When you fetch another Connection from the PooledDataSource, it will be undefined     *  whether the Connection returned will have your altered configuration, or the default     *  configuration of a "fresh" Connection. Thus, it is inadvisable to use this method to call     *  nonstandard mutators.      */    public Object rawConnectionOperation(Method m, Object target, Object[] args)	throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, SQLException;}