/**

 * 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.cxf.transport.servlet;

import java.io.IOException;

import java.io.InputStream;

import java.lang.reflect.Method;

import java.util.Collection;

import java.util.Enumeration;

import javax.servlet.ServletConfig;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import org.apache.cxf.Bus;

import org.apache.cxf.BusFactory;

import org.apache.cxf.common.util.ReflectionUtil;

import org.apache.cxf.helpers.CastUtils;

import org.springframework.context.ApplicationContext;

import org.springframework.context.ApplicationListener;

import org.springframework.context.event.ContextRefreshedEvent;

import org.springframework.context.support.AbstractApplicationContext;

import org.springframework.core.io.Resource;

import org.springframework.web.context.support.WebApplicationContextUtils;

import org.springframework.web.context.support.XmlWebApplicationContext;

public class CXFServlet extends CXFNonSpringServlet

    implements ApplicationListener<ContextRefreshedEvent> {

    private static final long serialVersionUID = -5922443981969455305L;

    private boolean busCreated;

    private XmlWebApplicationContext createdContext; 

    public CXFServlet() {

    }

    @Override

    protected void loadBus(ServletConfig sc) {

        ApplicationContext wac = WebApplicationContextUtils.

            getWebApplicationContext(sc.getServletContext());

        if (wac instanceof AbstractApplicationContext) {

            addListener((AbstractApplicationContext)wac);

        }

        String configLocation = sc.getInitParameter("config-location");

        if (configLocation == null) {

            try {

                InputStream is = sc.getServletContext().getResourceAsStream("/WEB-INF/cxf-servlet.xml");

                if (is != null && is.available() > ) {

                    is.close();

                    configLocation = "/WEB-INF/cxf-servlet.xml";

                }

            } catch (Exception ex) {

                //ignore

            }

        }

        if (configLocation != null) {

            wac = createSpringContext(wac, sc.getServletContext(), configLocation);

        }

        if (wac != null) {

            setBus((Bus)wac.getBean("cxf", Bus.class));

        } else {

            busCreated = true;

            setBus(BusFactory.newInstance().createBus());

        }

    }

    protected void addListener(AbstractApplicationContext wac) {

        try {

            //spring 2 vs spring 3 return type is different

            Method m = wac.getClass().getMethod("getApplicationListeners");

            Collection<Object> c = CastUtils.cast((Collection<?>)ReflectionUtil

                                                      .setAccessible(m).invoke(wac));

            c.add(this);

        } catch (Throwable t) {

            //ignore.

        }

    }

    /**

     * Try to create a spring application context from the config location.

     * Will first try to resolve the location using the servlet context.

     * If that does not work then the location is given as is to spring

     *

     * @param ctx

     * @param sc

     * @param configLocation

     * @return

     */

    private ApplicationContext createSpringContext(ApplicationContext ctx,

                                                   final ServletContext sc,

                                                   String location) {

        XmlWebApplicationContext ctx2 = new XmlWebApplicationContext();

        createdContext = ctx2;

        ctx2.setServletConfig(new ServletConfig() {

            public String getServletName() {

                return "CXF";

            }

            public ServletContext getServletContext() {

                return sc;

            }

            public String getInitParameter(String name) {

                return sc.getInitParameter(name);

            }

            public Enumeration<String> getInitParameterNames() {

                return sc.getInitParameterNames();

            }

        });

        Resource r = ctx2.getResource(location);

        try {

            InputStream in = r.getInputStream();

            in.close();

        } catch (IOException e) {

            //ignore

            r = ctx2.getResource("classpath:" + location);

            try {

                r.getInputStream().close();

            } catch (IOException e2) {

                //ignore

                r = null;

            }

        }

        try {

            if (r != null) {

                location = r.getURL().toExternalForm();

            }

        } catch (IOException e) {

            //ignore

        }

        if (ctx != null) {

            ctx2.setParent(ctx);

            String names[] = ctx.getBeanNamesForType(Bus.class);

            if (names == null || names.length == ) {

                ctx2.setConfigLocations(new String[] {"classpath:/META-INF/cxf/cxf.xml",

                                                      location});

            } else {

                ctx2.setConfigLocations(new String[] {location});

            }

        } else {

            ctx2.setConfigLocations(new String[] {"classpath:/META-INF/cxf/cxf.xml",

                                                  location});

            createdContext = ctx2;

        }

        ctx2.refresh();

        return ctx2;

    }

    public void destroyBus() {

        if (busCreated) {

            //if we created the Bus, we need to destroy it.  Otherwise, spring will handleit.

            getBus().shutdown(true);

            setBus(null);

        }

        if (createdContext != null) {

            createdContext.close();

        }

    }

    public void onApplicationEvent(ContextRefreshedEvent event) {

        destroy();

        setBus(null);

        try {

            init(getServletConfig());

        } catch (ServletException e) {

            throw new RuntimeException("Unable to reinitialize the CXFServlet", e);

        }

    }

}

 <context-param>

  <param-name>contextConfigLocation</param-name>

  <param-value>classpath*:conf/cxf-servlet.xml</param-value>

  </context-param>

 <listener>

  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

  </listener>