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1   // ========================================================================
2   // Copyright (c) 2009 Mort Bay Consulting Pty. Ltd.
3   // ------------------------------------------------------------------------
4   // All rights reserved. This program and the accompanying materials
5   // are made available under the terms of the Eclipse Public License v1.0
6   // and Apache License v2.0 which accompanies this distribution.
7   // The Eclipse Public License is available at 
8   // http://www.eclipse.org/legal/epl-v10.html
9   // The Apache License v2.0 is available at
10  // http://www.opensource.org/licenses/apache2.0.php
11  // You may elect to redistribute this code under either of these licenses. 
12  // ========================================================================
13  
14  package org.eclipse.jetty.annotations;
15  
16  import java.lang.reflect.Method;
17  import java.lang.reflect.Modifier;
18  
19  import javax.annotation.PreDestroy;
20  
21  import org.eclipse.jetty.annotations.AnnotationIntrospector.AbstractIntrospectableAnnotationHandler;
22  import org.eclipse.jetty.plus.annotation.LifeCycleCallbackCollection;
23  import org.eclipse.jetty.plus.annotation.PreDestroyCallback;
24  import org.eclipse.jetty.webapp.MetaData;
25  import org.eclipse.jetty.webapp.WebAppContext;
26  
27  public class PreDestroyAnnotationHandler extends AbstractIntrospectableAnnotationHandler
28  {
29      WebAppContext _context;
30      LifeCycleCallbackCollection _callbacks;
31      
32      public PreDestroyAnnotationHandler (WebAppContext wac)
33      {
34          super(true);
35          _context = wac;
36          _callbacks = (LifeCycleCallbackCollection)_context.getAttribute(LifeCycleCallbackCollection.LIFECYCLE_CALLBACK_COLLECTION);
37      }
38  
39      public void doHandle(Class clazz)
40      { 
41          //Check that the PreDestroy is on a class that we're interested in
42          if (Util.isServletType(clazz))
43          {
44              Method[] methods = clazz.getDeclaredMethods();
45              for (int i=0; i<methods.length; i++)
46              {
47                  Method m = (Method)methods[i];
48                  if (m.isAnnotationPresent(PreDestroy.class))
49                  {
50                      if (m.getParameterTypes().length != 0)
51                          throw new IllegalStateException(m+" has parameters");
52                      if (m.getReturnType() != Void.TYPE)
53                          throw new IllegalStateException(m+" is not void");
54                      if (m.getExceptionTypes().length != 0)
55                          throw new IllegalStateException(m+" throws checked exceptions");
56                      if (Modifier.isStatic(m.getModifiers()))
57                          throw new IllegalStateException(m+" is static");
58                      
59                      //ServletSpec 3.0 p80 If web.xml declares even one predestroy then all predestroys
60                      //in fragments must be ignored. Otherwise, they are additive.                    
61                      MetaData metaData = ((MetaData)_context.getAttribute(MetaData.METADATA));
62                      MetaData.Origin origin = metaData.getOrigin("pre-destroy");
63                      if (origin != null && 
64                              (origin == MetaData.Origin.WebXml ||
65                               origin == MetaData.Origin.WebDefaults || 
66                               origin == MetaData.Origin.WebOverride))
67                              return;
68                      
69                      PreDestroyCallback callback = new PreDestroyCallback();
70                      callback.setTarget(clazz.getName(), m.getName());
71                      _callbacks.add(callback);
72                  }
73              }
74          }
75      }
76  }