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JavaEE 1.6 API for Resin Java Application Server

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/*
 * Copyright (c) 1998-2018 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 javax.servlet;

import java.util.EventListener;

/**
 * Interface for a listener receiving events when any of the ServletRequest
 * attributes change.
 *
 * @since Servlet 2.4
 */
public interface ServletRequestAttributeListener extends EventListener {
  /**
   * Callback when a ServletRequest attribute is added.
   *
   * @param event the event for the added attribute event.
   */
  public void attributeAdded(ServletRequestAttributeEvent event);
  /**
   * Callback when a ServletRequest attribute is removed.
   *
   * @param event the event for the removed attribute event.
   */
  public void attributeRemoved(ServletRequestAttributeEvent event);
  /**
   * Callback when a ServletRequest attribute is replaced.
   *
   * @param event the event for the replaced attribute event.
   */
  public void attributeReplaced(ServletRequestAttributeEvent event);
}