/*
* 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.server.webapp;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.FilterChain;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
import com.caucho.server.http.CauchoRequestWrapper;
/**
* Represents the next filter in a filter chain. The final filter will
* be the servlet itself.
*/
public class DispatchFilterChain implements FilterChain {
private static final Logger log
= Logger.getLogger(DispatchFilterChain.class.getName());
// Next filter chain
private FilterChain _next;
// app
private WebApp _webApp;
// class loader
private ClassLoader _classLoader;
private ServletRequestListener []_requestListeners;
/**
* Creates a new FilterChainFilter.
*
* @param next the next filterChain
* @param webApp the webApp
*/
public DispatchFilterChain(FilterChain next,
WebApp webApp)
{
_next = next;
_webApp = webApp;
if (webApp != null) {
_classLoader = webApp.getClassLoader();
_requestListeners = webApp.getRequestListeners();
} else {
// server/1d01
_classLoader = Thread.currentThread().getContextClassLoader();
_requestListeners = new ServletRequestListener[0];
}
}
/**
* 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
{
Thread thread = Thread.currentThread();
ClassLoader oldLoader = thread.getContextClassLoader();
// server/10gf, server/10gv - listeners on web-app change
ServletContext webApp;
if (request instanceof CauchoRequestWrapper) {
CauchoRequestWrapper cReq = (CauchoRequestWrapper) request;
webApp = cReq.getRequest().getServletContext();
}
else
webApp = request.getServletContext();
try {
thread.setContextClassLoader(_classLoader);
if (webApp != _webApp) {
for (int i = 0; i < _requestListeners.length; i++) {
ServletRequestEvent event
= new ServletRequestEvent(_webApp, request);
_requestListeners[i].requestInitialized(event);
}
}
_next.doFilter(request, response);
} catch (FileNotFoundException e) {
// server/106c
/*
log.log(Level.FINER, e.toString(), e);
HttpServletResponse res = (HttpServletResponse) response;
res.sendError(404);
*/
throw e;
} finally {
if (webApp != _webApp) {
for (int i = _requestListeners.length - 1; i >= 0; i--) {
ServletRequestEvent event
= new ServletRequestEvent(_webApp, request);
_requestListeners[i].requestDestroyed(event);
}
}
thread.setContextClassLoader(oldLoader);
}
}
@Override
public String toString()
{
return getClass().getSimpleName() + "[" + _next + "]";
}
}