AttributesThreadLocalTargetSourceCreator


1   /*
2    * Copyright 2002-2005 the original author or authors.
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  
17  package org.springframework.aop.framework.autoproxy.metadata;
18  
19  import java.util.Collection  ;
20  
21  import org.springframework.aop.framework.autoproxy.target.AbstractBeanFactoryBasedTargetSourceCreator;
22  import org.springframework.aop.target.AbstractBeanFactoryBasedTargetSource;
23  import org.springframework.aop.target.ThreadLocalTargetSource;
24  import org.springframework.metadata.Attributes;
25  
26  /**
27   * PrototypeTargetSourceCreator driven by metadata. Creates a ThreadLocalTargetSource
28   * only if there's a ThreadLocalAttribute associated with the class.
29   *
30   * @author Rod Johnson
31   * @see org.springframework.aop.target.ThreadLocalTargetSource
32   */
33  public class AttributesThreadLocalTargetSourceCreator extends AbstractBeanFactoryBasedTargetSourceCreator {
34  
35      /**
36       * Underlying Attributes implementation that we're using.
37       */
38      private Attributes attributes;
39  
40      /**
41       * Create a new AttributesThreadLocalTargetSourceCreator.
42       * @see #setAttributes
43       */
44      public AttributesThreadLocalTargetSourceCreator() {
45      }
46  
47      /**
48       * Create a new AttributesThreadLocalTargetSourceCreator.
49       * @param attributes the Attributes implementation to use
50       */
51      public AttributesThreadLocalTargetSourceCreator(Attributes attributes) {
52          if (attributes == null) {
53              throw new IllegalArgumentException  ("Attributes is required");
54          }
55          this.attributes = attributes;
56      }
57  
58      /**
59       * Set the Attributes implementation to use.
60       */
61      public void setAttributes(Attributes attributes) {
62          this.attributes = attributes;
63      }
64  
65      public void afterPropertiesSet() {
66          if (this.attributes == null) {
67              throw new IllegalArgumentException  ("'attributes' is required");
68          }
69      }
70  
71      protected AbstractBeanFactoryBasedTargetSource createBeanFactoryBasedTargetSource(
72              Class   beanClass, String   beanName) {
73  
74          // See if there's a pooling attribute.
75          Collection   atts = this.attributes.getAttributes(beanClass, ThreadLocalAttribute.class);
76          if (atts.isEmpty()) {
77              // No pooling attribute: don't create a custom TargetSource.
78              return null;
79          }
80          else {
81              return new ThreadLocalTargetSource();
82          }
83      }
84  
85  }
86
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