/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source 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 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.quercus.env;
import java.lang.ref.*;
import com.caucho.util.*;
/**
* Cache entry root
*/
public class UnserializeCacheEntry
{
private FreeList<SoftReference<CopyRoot>> _freeList;
private SoftReference<Value> _valueRef;
public UnserializeCacheEntry(Value value)
{
_valueRef = new SoftReference<Value>(value);
}
public UnserializeCacheEntry(Env env, Value value)
{
CopyRoot root = new CopyRoot(this);
value = value.copyTree(env, root);
_valueRef = new SoftReference<Value>(value);
}
public Value getValue(Env env)
{
SoftReference<CopyRoot> copyRef = null;
if (_freeList != null)
copyRef = _freeList.allocate();
if (copyRef != null) {
CopyRoot copy = copyRef.get();
if (copy != null) {
copy.allocate(env);
return copy.getRoot();
}
}
Value value = null;
if (_valueRef != null)
value = _valueRef.get();
if (value != null) {
CopyRoot root = new CopyRoot(this);
root.allocate(env);
Value copy = value.copyTree(env, root);
root.setRoot(copy);
return copy;
}
else
return null;
}
public void clear()
{
_valueRef = null;
_freeList = null;
}
void free(CopyRoot root)
{
if (_freeList == null)
_freeList = new FreeList<SoftReference<CopyRoot>>(2);
_freeList.free(new SoftReference<CopyRoot>(root));
}
}