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    1   /*
    2    * $Id: PlexusLifecycleListener.java 471756 2006-11-06 15:01:43Z husted $
    3    *
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "License"); you may not use this file except in compliance
    10   * with the License.  You may obtain a copy of the License at
    11   *
    12   *  http://www.apache.org/licenses/LICENSE-2.0
    13   *
    14   * Unless required by applicable law or agreed to in writing,
    15   * software distributed under the License is distributed on an
    16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    17   * KIND, either express or implied.  See the License for the
    18   * specific language governing permissions and limitations
    19   * under the License.
    20   */
    21  package org.apache.struts2.plexus;
    22
    23  import java.util.Collections;
    24
    25  import javax.servlet.ServletContext;
    26  import javax.servlet.ServletContextEvent;
    27  import javax.servlet.ServletContextListener;
    28  import javax.servlet.http.HttpSession;
    29  import javax.servlet.http.HttpSessionEvent;
    30  import javax.servlet.http.HttpSessionListener;
    31
    32  import org.apache.commons.logging.Log;
    33  import org.apache.commons.logging.LogFactory;
    34  import org.codehaus.plexus.DefaultPlexusContainer;
    35  import org.codehaus.plexus.PlexusContainer;
    36
    37  /***
    38   * Manages the Plexus lifecycle for the servlet and session contexts
    39   */
    40  public class PlexusLifecycleListener implements ServletContextListener, HttpSessionListener {
    41      private static final Log log = LogFactory.getLog(PlexusObjectFactory.class);
    42
    43      private static boolean loaded = false;
    44      public static final String KEY = "struts.plexus.container";
    45
    46      /***
    47       * @return Returns if the container is loaded.
    48       */
    49      public static boolean isLoaded() {
    50          return loaded;
    51      }
    52
    53      /* (non-Javadoc)
    54       * @see javax.servlet.ServletContextListener#contextInitialized(javax.servlet.ServletContextEvent)
    55       */
    56      public void contextInitialized(ServletContextEvent servletContextEvent) {
    57          loaded = true;
    58
    59          try {
    60              PlexusContainer pc = new DefaultPlexusContainer();
    61              PlexusUtils.configure(pc, "plexus-application.xml");
    62              ServletContext ctx = servletContextEvent.getServletContext();
    63              ctx.setAttribute(KEY, pc);
    64
    65              pc.initialize();
    66              pc.start();
    67          } catch (Exception e) {
    68              log.error("Error initializing plexus container (scope: application)", e);
    69          }
    70      }
    71
    72      /* (non-Javadoc)
    73       * @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
    74       */
    75      public void contextDestroyed(ServletContextEvent servletContextEvent) {
    76          try {
    77              ServletContext ctx = servletContextEvent.getServletContext();
    78              PlexusContainer pc = (PlexusContainer) ctx.getAttribute(KEY);
    79              pc.dispose();
    80          } catch (Exception e) {
    81              log.error("Error disposing plexus container (scope: application)", e);
    82          }
    83      }
    84
    85      /* (non-Javadoc)
    86       * @see javax.servlet.http.HttpSessionListener#sessionCreated(javax.servlet.http.HttpSessionEvent)
    87       */
    88      public void sessionCreated(HttpSessionEvent httpSessionEvent) {
    89          try {
    90              HttpSession session = httpSessionEvent.getSession();
    91              ServletContext ctx = session.getServletContext();
    92              PlexusContainer parent = (PlexusContainer) ctx.getAttribute(KEY);
    93              PlexusContainer child = parent.createChildContainer("session", Collections.EMPTY_LIST, Collections.EMPTY_MAP);
    94              session.setAttribute(KEY, child);
    95              PlexusUtils.configure(child, "plexus-session.xml");
    96              child.initialize();
    97              child.start();
    98          } catch (Exception e) {
    99              log.error("Error initializing plexus container (scope: session)", e);
    100         }
    101     }
    102
    103     /* (non-Javadoc)
    104      * @see javax.servlet.http.HttpSessionListener#sessionDestroyed(javax.servlet.http.HttpSessionEvent)
    105      */
    106     public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
    107         try {
    108             HttpSession session = httpSessionEvent.getSession();
    109             PlexusContainer child = (PlexusContainer) session.getAttribute(KEY);
    110             child.dispose();
    111         } catch (Exception e) {
    112             log.error("Error initializing plexus container (scope: session)", e);
    113         }
    114     }
    115 }