com.mchange.v1.db.sql.WeakHashPSManager Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.9
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* 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.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v1.db.sql;
import java.sql.*;
import java.util.*;
/*
* I think this class is insufficient, because the
* values may be strongly referenced by the map, and
* PreparedStatements may contain a backreference to
* their connections.
*/
public class WeakHashPSManager implements PSManager
{
WeakHashMap wmap = new WeakHashMap();
public PreparedStatement getPS(Connection con, String stmt_name)
{
Map nameMap = (Map) wmap.get(con);
return (nameMap == null ? null : (PreparedStatement) nameMap.get(stmt_name));
}
public void putPS(Connection con, String name, PreparedStatement stmt)
{
Map nameMap = (Map) wmap.get(con);
if (nameMap == null)
{
nameMap = new HashMap();
wmap.put(con, nameMap);
}
nameMap.put(name, stmt);
}
}