/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: ObjectPool.java
* Written by: Christian Julg, Jonas Thedering (Team 1)
*
* 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.experimentalAStar1;
/**
* Implements object pooling by collecting unneeded objects and
* handing them out later
*
* @author Jonas Thedering
* @author Christian Jülg
*/
public class ObjectPool<T extends Poolable<T>> {
private Class<T> instanceCreator;
private T listHead = null;
/** @param instanceCreator The class object for class T */
public ObjectPool(Class<T> instanceCreator) {
this.instanceCreator = instanceCreator;
}
public T alloc() {
if(listHead == null)
try {
//Can't use "new T()", because generics don't allow it
return instanceCreator.newInstance();
}
catch(InstantiationException e) {
return null;
}
catch(IllegalAccessException e) {
return null;
}
else {
T temp = listHead;
listHead = listHead.getTail();
return temp;
}
}
public void free(T object) {
object.setTail(listHead);
listHead = object;
}
// Assumes that setTail was used to make a list of poolables from head to last
public void freeAllLinked(T head, T last) {
last.setTail(listHead);
listHead = head;
}
}