componentclose.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 73 行

/*
 * Copyright (c) 1998-2008 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.webbeans.component;

import java.lang.ref.*;

import com.caucho.config.*;
import com.caucho.loader.*;

/**
 * Waits for the close event and calls a destroy() method.
 */
public class ComponentClose implements ClassLoaderListener {
  private final WeakReference<Object> _ref;
  private final ComponentImpl _comp;

  public ComponentClose(Object value, ComponentImpl comp)
  {
    _comp = comp;
    _ref = new WeakReference<Object>(value);
  }

  /**
   * Handles the case where a class loader is activated.
   */
  public void classLoaderInit(DynamicClassLoader loader)
  {
  }
  
  /**
   * Handles the case where a class loader is dropped.
   */
  public void classLoaderDestroy(DynamicClassLoader loader)
  {
    Object obj = _ref.get();

    if (obj != null)
      _comp.destroy(obj, new ConfigContext());
  }

  public String toString()
  {
    return getClass().getSimpleName() + "[" + _comp + "]";
  }
}