/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, Lotus
* Development Corporation., http://www.lotus.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.xalan.lib.sql;
/**
* <P>
* Provides a mechinism where a shared collection of connection
* pools can exist. Connection Pools are referenced by name.
* <P><HR>
*
* Title: PoolManager<p>
* @author John Gentilin
* @version 1.0
*
*/
import java.util.Hashtable;
import java.lang.IllegalArgumentException;
public class XConnectionPoolManager
{
static Hashtable m_poolTable = null;
static boolean m_isInit = false;
public XConnectionPoolManager()
{
init();
}
/**
* Initialize the internal structures of the Pool Manager
*
*/
public synchronized void init()
{
// Only do this process once
if (m_isInit == true) return;
//
// Initialize the pool table
//
m_poolTable = new Hashtable();
m_isInit = true;
}
/**
* Register a nuew connection pool to the global pool table.
* If a pool by that name currently exists, then throw an
* IllegalArgumentException stating that the pool already
* exist.
*
* @param <code>String name</code>, the name of the pool to
* add to the list.
*
* @param <code>ConnectionPool</code> the Connection Pool to
* be added, this pool must already be set up to accept connections.
* see {@link org.apache.xalan.lib.sql.ConnectionPool}
*
* @throws <code>IllegalArgumentException</code>, throw this exception
* if a pool with the same name currently exists.
*
*/
public synchronized void registerPool(String name, ConnectionPool pool)
{
if ( m_poolTable.containsKey(name) )
{
throw new IllegalArgumentException("Pool already exists");
}
m_poolTable.put(name, pool);
}
/**
* Remove a pool from the global table. If the pool still has
* active connections, then only mark this pool as inactive and
* leave it around until all the existing connections are closed.
*
* @param <code>String name</code> name of the pool to remove.
*
*/
public synchronized void removePool(String name)
{
ConnectionPool pool = getPool(name);
if (null != pool)
{
//
// Disable future use of this pool under the Xalan
// extension only. This flag should only exist in the
// wrapper and not in the actual pool implementation.
pool.disablePool();
//
// Remove the pool from the Hashtable if we don'd have
// any active connections.
//
if ( ! pool.hasActiveConnections() ) m_poolTable.remove(name);
}
}
/**
* Return the connection pool referenced by the name
*
* @param <code>String name</code>, name of the pool to be returned.
*
* @returns <code>ConnectionPool</code> a reference to the ConnectionPool
* object stored in the Pool Table. If the named pool does not exist, return
* null
*
*/
public synchronized ConnectionPool getPool(String name)
{
return (ConnectionPool) m_poolTable.get(name);
}
}