/*
* 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.dispatch;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.ref.SoftReference;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.FilterChain;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.SingleThreadModel;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.caucho.jsp.Page;
import com.caucho.jsp.QServlet;
import com.caucho.server.http.AbstractHttpRequest;
/**
* Represents the final servlet in a filter chain.
*/
public class PageFilterChain implements FilterChain
{
private static final Logger log
= Logger.getLogger(PageFilterChain.class.getName());
private ServletContext _application;
private QServlet _servlet;
private String _jspFile;
private ServletConfigImpl _config;
private ServletContext _servletContext;
private SoftReference<Page> _pageRef;
private boolean _isSingleThread;
/**
* Create the filter chain servlet.
*
* @param servlet the JSP servlet
*/
PageFilterChain(ServletContext application, QServlet servlet)
{
_application = application;
_servlet = servlet;
}
/**
* Create the filter chain servlet.
*
* @param servlet the JSP servlet
*/
PageFilterChain(ServletContext application, QServlet servlet,
String jspFile, ServletConfigImpl config)
{
_application = application;
_servlet = servlet;
_jspFile = jspFile;
_config = config;
}
/**
* Sets the servlet context.
*/
public void setServletContext(ServletContext servletContext)
{
_servletContext = servletContext;
}
/**
* Gets the servlet context.
*/
public ServletContext getServletContext()
{
return _servletContext;
}
/**
* Returns the servlet.
*/
public QServlet getServlet()
{
return _servlet;
}
/**
* Invokes the final servlet at the end of the chain.
*
* @param request the servlet request
* @param response the servlet response
*/
@Override
public void doFilter(ServletRequest request, ServletResponse response)
throws ServletException, IOException
{
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;
FileNotFoundException notFound = null;
SoftReference<Page> pageRef = _pageRef;
Page page;
if (pageRef != null)
page = pageRef.get();
else
page = null;
if (page == null || page._caucho_isModified()) {
try {
_pageRef = null;
page = compilePage(page, req, res);
if (page != null) {
_pageRef = new SoftReference<Page>(page);
_isSingleThread = page instanceof SingleThreadModel;
}
} catch (FileNotFoundException e) {
page = null;
notFound = e;
}
}
if (page == null) {
// jsp/01cg
if (notFound == null)
return;
String errorUri = (String) req.getAttribute(RequestDispatcher.ERROR_REQUEST_URI);
String uri = (String) req.getAttribute(RequestDispatcher.INCLUDE_REQUEST_URI);
String forward = (String) req.getAttribute(RequestDispatcher.FORWARD_REQUEST_URI);
// jsp/01ch
if (uri != null) {
//throw new FileNotFoundException(uri);
throw notFound;
}
else if (forward != null) {
//throw new FileNotFoundException(req.getRequestURI());
throw notFound;
}
else if (errorUri != null) {
//throw new FileNotFoundException(errorUri);
throw notFound;
}
else {
log.log(Level.FINER, notFound.toString(), notFound);
}
((HttpServletResponse) res).sendError(HttpServletResponse.SC_NOT_FOUND);
}
else if (req instanceof HttpServletRequest) {
try {
if (_isSingleThread) {
synchronized (page) {
page.pageservice(req, res);
}
}
else
page.pageservice(req, res);
} catch (ServletException e) {
request.setAttribute(RequestDispatcher.ERROR_EXCEPTION, e);
if (_config != null)
request.setAttribute(RequestDispatcher.ERROR_SERVLET_NAME,
_config.getServletName());
throw e;
} catch (IOException e) {
request.setAttribute(RequestDispatcher.ERROR_EXCEPTION, e);
if (_config != null)
request.setAttribute(RequestDispatcher.ERROR_SERVLET_NAME,
_config.getServletName());
throw e;
} catch (RuntimeException e) {
request.setAttribute(RequestDispatcher.ERROR_EXCEPTION, e);
if (_config != null)
request.setAttribute(RequestDispatcher.ERROR_SERVLET_NAME,
_config.getServletName());
throw e;
}
}
}
/**
* Compiles the page, returning the new page.
*/
private Page compilePage(Page oldPage,
HttpServletRequest req,
HttpServletResponse res)
throws ServletException, FileNotFoundException
{
Page newPage = null;
if (oldPage != null && ! oldPage.startRecompiling()) {
return oldPage;
}
try {
if (_jspFile != null) {
req.setAttribute("caucho.jsp.jsp-file", _jspFile);
req.setAttribute("caucho.jsp.servlet-config", _config);
}
if (_config != null)
newPage = (Page) _config.createServlet(false);
else {
newPage = _servlet.getPage(req, res);
if (newPage != null && ! newPage.isInit()) {
ServletConfigImpl config = new ServletConfigImpl();
config.setServletContext(_application);
config.setServletName(req.getServletPath());
newPage.caucho_init(config);
}
}
// XXX: In theory, should let the requests drain. In practice,
// the JSP destroy() method doesn't do anything.
if (oldPage != null && ! oldPage.isDead())
oldPage.destroy();
if (newPage != null)
newPage._caucho_use();
return newPage;
} catch (ServletException e) {
throw e;
} catch (RuntimeException e) {
throw e;
} catch (FileNotFoundException e) {
throw e;
} catch (Exception e) {
throw new ServletException(e);
} finally {
if (_jspFile != null) {
req.removeAttribute("caucho.jsp.jsp-file");
req.removeAttribute("caucho.jsp.servlet-config");
}
}
}
public String toString()
{
if (_config != null)
return getClass().getSimpleName() + "[" + _config + "]";
else
return getClass().getSimpleName() + "[" + _servlet + "]";
}
}