/*
* 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 SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.loader;
import com.caucho.util.L10N;
import java.lang.ref.WeakReference;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Waits for the stop event and calls a @PreDestroy
*/
public class WeakDestroyListener implements EnvironmentListener {
private static final L10N L = new L10N(WeakDestroyListener.class);
private static final Logger log
= Logger.getLogger(WeakDestroyListener.class.getName());
private Method _preDestroy;
private WeakReference<Object> _objRef;
/**
* Creates the new stop listener.
*
* @param resource the resource which needs closing
*/
public WeakDestroyListener(Method preDestroy, Object obj)
{
_preDestroy = preDestroy;
_objRef = new WeakReference<Object>(obj);
}
/**
* Handles the case where a class loader is configured.
*/
public void environmentConfigure(EnvironmentClassLoader loader)
{
}
/**
* Handles the case where a class loader is bind.
*/
public void environmentBind(EnvironmentClassLoader loader)
{
}
/**
* Handles the case where a class loader is activated.
*/
public void environmentStart(EnvironmentClassLoader loader)
{
}
/**
* Handles the case where a class loader is dropped.
*/
public void environmentStop(EnvironmentClassLoader loader)
{
Object obj = _objRef.get();
if (obj == null)
return;
try {
_preDestroy.invoke(obj, (Object []) null);
} catch (Throwable e) {
log.log(Level.WARNING, e.toString(), e);
}
}
}