org.ireland.jnetty.dispatch.filterchain.ServletRequestListenerFilterChain.java Source code

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Here is the source code for org.ireland.jnetty.dispatch.filterchain.ServletRequestListenerFilterChain.java

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/*
 * Copyright (c) 1998-2012 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 org.ireland.jnetty.dispatch.filterchain;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.ServletResponse;

import org.ireland.jnetty.webapp.WebApp;

import java.io.IOException;
import java.util.List;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.Log;

/**
 * 
 * ServletRequestListenerFilterChain 
 * 
 */
public class ServletRequestListenerFilterChain implements FilterChain {
    private static final Log log = LogFactory.getLog(ServletRequestListenerFilterChain.class.getName());

    // Next filter chain
    private FilterChain _next;

    // app
    private WebApp _webApp;

    private List<ServletRequestListener> _requestListeners;

    /**
     * Creates a new FilterChainFilter.
     * 
     * @param next
     *            the next filterChain
     * @param filter
     *            the user's filter
     */
    public ServletRequestListenerFilterChain(FilterChain next, WebApp webApp,
            List<ServletRequestListener> requestListeners) {
        _next = next;
        _webApp = webApp;
        _requestListeners = requestListeners;
    }

    /**
     * Returns true if cacheable.
     */
    public FilterChain getNext() {
        return _next;
    }

    /**
     * Invokes the next filter in the chain or the final servlet at the end of the chain.
     * 
     * @param request
     *            the servlet request
     * @param response
     *            the servlet response
     * @since Servlet 2.3
     */
    @Override
    public void doFilter(ServletRequest request, ServletResponse response) throws ServletException, IOException {
        try {
            //?ServletRequestListener#requestInitialized
            for (ServletRequestListener listener : _requestListeners) {
                ServletRequestEvent event = new ServletRequestEvent(_webApp, request);

                listener.requestInitialized(event);
            }

            _next.doFilter(request, response);
        } finally {
            //?ServletRequestListener#requestDestroyed
            for (int i = _requestListeners.size() - 1; i >= 0; i--) {
                try {
                    ServletRequestEvent event = new ServletRequestEvent(_webApp, request);

                    _requestListeners.get(i).requestDestroyed(event);
                } catch (Throwable e) {
                    log.warn(e.toString(), e);
                }
            }
        }
    }

    @Override
    public String toString() {
        return (getClass().getSimpleName() + "[" + _webApp.getURL() + ", next=" + _next + "]");
    }
}