/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: AStarRegionNodeObjectPool.java
* Written by: Christian Harnisch, Ingo Besenfelder, Michael Neumann (Team 3)
*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
*
* Electric(tm) is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Electric(tm) 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Electric(tm); see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, Mass 02111-1307, USA.
*/
package com.sun.electric.tool.routing.experimentalAStar3.memorymanager;
import com.sun.electric.tool.routing.experimentalAStar3.algorithm.AStarRegionNode;
/**
* Optimized memory pool for AStarNode objects, without the need of an extrusive
* list.
*
* We are using the AStarNode's origin pointer for chaining all unused nodes.
*
* @author Michael Neumann
*
*/
public class AStarRegionNodeObjectPool implements ObjectPool<AStarRegionNode>
{
private AStarRegionNode free_list;
public AStarRegionNodeObjectPool()
{
free_list = null;
}
public AStarRegionNode acquire()
{
AStarRegionNode object;
if (free_list == null)
{
object = new AStarRegionNode();
}
else
{
object = free_list;
free_list = object.origin; // the next free object
}
return object;
}
public void release(AStarRegionNode object)
{
object.origin = free_list;
free_list = object;
}
}