EfficientShutdownServletContextAttributeListener


1   /*
2    * Copyright 2005 Joe Walker
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.directwebremoting.servlet;
17  
18  import java.util.List  ;
19  
20  import javax.servlet.ServletContextAttributeEvent  ;
21  import javax.servlet.ServletContextAttributeListener  ;
22  
23  import org.directwebremoting.extend.ServerLoadMonitor;
24  import org.directwebremoting.impl.ContainerUtil;
25  
26  /**
27   * A {@link ServletContextAttributeListener} that can be used to call
28   * {@link ServerLoadMonitor#shutdown()} when the servlet container is stopped
29   * @author Joe Walker [joe at getahead dot ltd dot uk]
30   */
31  public class EfficientShutdownServletContextAttributeListener implements ServletContextAttributeListener  
32  {
33      /* (non-Javadoc)
34       * @see javax.servlet.ServletContextAttributeListener#attributeAdded(javax.servlet.ServletContextAttributeEvent)
35       */
36      public void attributeAdded(ServletContextAttributeEvent   ev)
37      {
38      }
39  
40      /* (non-Javadoc)
41       * @see javax.servlet.ServletContextAttributeListener#attributeRemoved(javax.servlet.ServletContextAttributeEvent)
42       */
43      public void attributeRemoved(ServletContextAttributeEvent   ev)
44      {
45          if (ev.getName().equals(ContainerUtil.ATTRIBUTE_CONTAINER_LIST))
46          {
47              List   containers = (List  ) ev.getValue();
48              ContainerUtil.shutdownServerLoadMonitorsInContainerList(containers, "EfficientShutdownServletContextAttributeListener");
49          }
50      }
51  
52      /* (non-Javadoc)
53       * @see javax.servlet.ServletContextAttributeListener#attributeReplaced(javax.servlet.ServletContextAttributeEvent)
54       */
55      public void attributeReplaced(ServletContextAttributeEvent   ev)
56      {
57      }
58  }
59  
60
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