BeanDefinitionProtocol


1   /*
2    * All content copyright (c) 2003-2006 Terracotta, Inc., except as may otherwise be noted in a separate copyright notice.  All rights reserved.
3    */
4   package com.tcspring;
5   
6   import org.springframework.beans.factory.config.BeanDefinitionHolder;
7   import org.springframework.beans.factory.support.AbstractBeanDefinition;
8   import org.springframework.beans.factory.support.BeanDefinitionReader;
9   import org.springframework.beans.factory.support.DefaultListableBeanFactory;
10  import org.springframework.core.io.ClassPathResource;
11  import org.springframework.core.io.FileSystemResource;
12  import org.springframework.core.io.Resource;
13  import org.springframework.util.ClassUtils;
14  import org.springframework.web.context.support.ServletContextResource;
15  
16  import com.tc.aspectwerkz.joinpoint.StaticJoinPoint;
17  import com.tc.aspectwerkz.reflect.impl.asm.AsmClassInfo;
18  
19  import java.util.HashMap  ;
20  import java.util.Iterator  ;
21  import java.util.Map  ;
22  
23  /**
24   * Advice for collecting bean metadata.
25   * 
26   * @see com.tc.object.config.SpringAspectModule#buildDefinitionForBeanDefinitionProtocol()
27   * 
28   * @author Eugene Kuleshov
29   */
30  public class BeanDefinitionProtocol {
31  
32    private final Map   beanMap = new HashMap  ();
33    private final Map   classes = new HashMap  ();
34  
35    
36    /**
37     * Invoked after loadBeanDefinitions method in BeanDefinitionReader. Adds resource location to the DistributableBeanFactory mixin.
38     * 
39     * @see org.springframework.beans.factory.support.BeanDefinitionReader#loadBeanDefinitions(org.springframework.core.io.Resource)
40     */
41    public void captureIdentity(StaticJoinPoint jp, Resource resource, BeanDefinitionReader reader) throws Throwable   {
42      Object   beanFactory = reader.getBeanFactory();
43      if (beanFactory instanceof DistributableBeanFactory) {
44        String   location;
45        if (resource instanceof ClassPathResource) {
46          location = ((ClassPathResource) resource).getPath();
47        } else if (resource instanceof FileSystemResource) {
48          location = ((FileSystemResource) resource).getPath();
49        } else if (resource instanceof ServletContextResource) {
50          location = ((ServletContextResource) resource).getPath();
51        } else {
52          location = resource.getDescription();
53        }
54  
55        DistributableBeanFactory distributableBeanFactory = (DistributableBeanFactory) beanFactory;
56        distributableBeanFactory.addLocation(location);
57      }
58    }
59    
60    
61    /**
62     * Collects the different spring bean configuration files.
63     * <tt>
64     * Advices: Around(
65     *        execution(* org.springframework.context.support.AbstractRefreshableApplicationContext+.loadBeanDefinitions(..)) 
66     *        AND args(beanFactory))
67     * </tt>
68     */
69    public Object   collectDefinitions(StaticJoinPoint jp, DefaultListableBeanFactory beanFactory) throws Throwable   {
70      try {
71        return jp.proceed();
72      } finally {
73        
74        if (beanFactory instanceof DistributableBeanFactory) {
75          ((DistributableBeanFactory) beanFactory).registerBeanDefinitions(beanMap);
76        }
77  
78        for (Iterator   it = beanMap.entrySet().iterator(); it.hasNext();) {
79          Map.Entry   entry = (Map.Entry  ) it.next();
80          AbstractBeanDefinition definition = (AbstractBeanDefinition) entry.getValue();
81  
82          String   beanClassName = definition.getBeanClassName();
83          if (beanClassName == null) continue;
84          
85          ClassLoader   loader = (ClassLoader  ) classes.get(beanClassName);
86          if(loader==null) continue;
87          
88          try {
89            Class   c = ClassUtils.forName(beanClassName, loader);
90            definition.setBeanClass(c);
91          } catch (Exception   e) {
92            // ignore
93          }
94        }      
95      }
96    }
97  
98    /**
99     * Since Spring 2.0m5 ClassUtils.forName() is not called when bean definitions are created 
100    * 
101    * @see org.springframework.beans.factory.support.BeanDefinitionReaderUtils#createBeanDefinition()
102    */
103   public Object   disableClassForName(String   className, ClassLoader   loader) throws Exception   {
104     try {
105       AsmClassInfo.getClassInfo(className, loader);
106       // TODO this can be potential class loader clash
107       classes.put(className, loader);
108     } catch (Exception   e) {
109       throw new ClassNotFoundException  (className);
110     }    
111     return null;
112   }
113 
114   /**
115    * Called after constructor initialization on <code>BeanDefinitionHolder</code> class
116    * 
117    * @see org.springframework.beans.factory.config.BeanDefinitionHolder
118    */
119   public void saveBeanDefinition(StaticJoinPoint jp, BeanDefinitionHolder holder) {
120     beanMap.put(holder.getBeanName(), holder.getBeanDefinition());
121   }  
122 }
123 
124
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