/*
* $Id$
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.struts2.plexus;
import java.io.IOException;
import java.util.Collections;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.codehaus.plexus.PlexusContainer;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;
/**
* Creates a plexus container for the application, session, and request
*/
public class PlexusFilter implements Filter {
private static final Logger LOG = LogManager.getLogger(PlexusObjectFactory.class);
private static final String CHILD_CONTAINER_NAME = "request";
private static boolean loaded = false;
private ServletContext ctx;
/**
* @return Returns if the container is loaded.
*/
public static boolean isLoaded() {
return loaded;
}
/* (non-Javadoc)
* @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
*/
public void init(FilterConfig filterConfig) throws ServletException {
ctx = filterConfig.getServletContext();
loaded = true;
}
/* (non-Javadoc)
* @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
*/
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
PlexusContainer child = null;
try {
try {
HttpServletRequest request = (HttpServletRequest) req;
HttpSession session = request.getSession(false);
PlexusContainer parent;
if (session != null) {
parent = (PlexusContainer) session.getAttribute(PlexusLifecycleListener.KEY);
} else {
parent = (PlexusContainer) ctx.getAttribute(PlexusLifecycleListener.KEY);
}
if (parent.hasChildContainer(CHILD_CONTAINER_NAME)) {
if (LOG.isWarnEnabled()) {
LOG.warn("Plexus container (scope: request) alredy exist.");
}
child = parent.getChildContainer(CHILD_CONTAINER_NAME);
} else {
child = parent.createChildContainer(CHILD_CONTAINER_NAME, Collections.EMPTY_LIST, Collections.EMPTY_MAP);
PlexusUtils.configure(child, "plexus-request.xml");
child.initialize();
child.start();
}
PlexusThreadLocal.setPlexusContainer(child);
} catch (Exception e) {
LOG.error("Error initializing plexus container (scope: request)", e);
}
chain.doFilter(req, res);
}
finally {
try {
if (child != null) {
child.dispose();
}
PlexusThreadLocal.setPlexusContainer(null);
} catch (Exception e) {
LOG.error("Error disposing plexus container (scope: request)", e);
}
}
}
/* (non-Javadoc)
* @see javax.servlet.Filter#destroy()
*/
public void destroy() {
}
}