package org.apache.archiva.webdav.util;
   /*
    * 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.
   */
  
  import org.apache.archiva.indexer.merger.IndexMerger;
  import org.apache.archiva.indexer.merger.TemporaryGroupIndex;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.web.context.WebApplicationContext;
  import org.springframework.web.context.support.WebApplicationContextUtils;
  
  import javax.servlet.http.HttpSessionEvent;
  import javax.servlet.http.HttpSessionListener;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * this http session listener will delete repository group index requested by a user
   * at this end of the http session
   *
   * @author Olivier Lamy
   * @since 1.4-M2
   */
  public class TemporaryGroupIndexSessionCleaner
      implements HttpSessionListener
  {
  
      private Logger log = LoggerFactory.getLogger( getClass() );
  
      private IndexMerger indexMerger;
  
      public static final String TEMPORARY_INDEX_SESSION_KEY = TemporaryGroupIndexSessionCleaner.class.getName();
  
      public void sessionCreated( HttpSessionEvent httpSessionEvent )
      {
          // ensure the map is here to avoid NPE
          if ( httpSessionEvent.getSession().getAttribute( TEMPORARY_INDEX_SESSION_KEY ) == null )
          {
              httpSessionEvent.getSession().setAttribute( TEMPORARY_INDEX_SESSION_KEY,
                                                          new HashMap<String, TemporaryGroupIndex>() );
          }
  
          if ( indexMerger == null )
          {
              WebApplicationContext webApplicationContext = WebApplicationContextUtils.getRequiredWebApplicationContext(
                  httpSessionEvent.getSession().getServletContext() );
              indexMerger = webApplicationContext.getBean( IndexMerger.class );
          }
      }
  
      public void sessionDestroyed( HttpSessionEvent httpSessionEvent )
      {
          Map<String, TemporaryGroupIndex> tempFilesPerKey =
              (Map<String, TemporaryGroupIndex>) httpSessionEvent.getSession().getAttribute(
                  TEMPORARY_INDEX_SESSION_KEY );
  
          for ( TemporaryGroupIndex temporaryGroupIndex : tempFilesPerKey.values() )
          {
              log.info( "cleanup temporaryGroupIndex {} directory {}", temporaryGroupIndex.getIndexId(),
                        temporaryGroupIndex.getDirectory().getAbsolutePath() );
              getIndexMerger( httpSessionEvent ).cleanTemporaryGroupIndex( temporaryGroupIndex );
          }
      }
  
      private IndexMerger getIndexMerger( HttpSessionEvent httpSessionEvent )
      {
          if ( indexMerger == null )
          {
              WebApplicationContext webApplicationContext = WebApplicationContextUtils.getRequiredWebApplicationContext(
                  httpSessionEvent.getSession().getServletContext() );
              indexMerger = webApplicationContext.getBean( IndexMerger.class );
          }
          return indexMerger;
      }
  }