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Java > Open Source Codes > org > springframework > context > access > ContextBeanFactoryReference


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.context.access;
18
19 import org.springframework.beans.factory.BeanFactory;
20 import org.springframework.beans.factory.access.BeanFactoryReference;
21 import org.springframework.context.ApplicationContext;
22 import org.springframework.context.ConfigurableApplicationContext;
23
24 /**
25  * ApplicationContext-specific implementation of BeanFactoryReference,
26  * wrapping a newly created ApplicationContext, closing it on release.
27  *
28  * <p>As per BeanFactoryReference contract, <code>release</code> may be called
29  * more than once, with subsequent calls not doing anything. However, calling
30  * <code>getFactory</code> after a <code>release</code> call will cause an exception.
31  *
32  * @author Juergen Hoeller
33  * @author Colin Sampaleanu
34  * @since 13.02.2004
35  * @see org.springframework.context.ConfigurableApplicationContext#close
36  */
37 public class ContextBeanFactoryReference implements BeanFactoryReference {
38
39     private ApplicationContext applicationContext;
40
41
42     /**
43      * Create a new ContextBeanFactoryReference for the given context.
44      * @param applicationContext the ApplicationContext to wrap
45      */
46     public ContextBeanFactoryReference(ApplicationContext applicationContext) {
47         this.applicationContext = applicationContext;
48     }
49
50
51     public BeanFactory getFactory() {
52         if (this.applicationContext == null) {
53             throw new IllegalStateException JavaDoc(
54                     "ApplicationContext owned by this BeanFactoryReference has been released");
55         }
56         return this.applicationContext;
57     }
58
59     public void release() {
60         if (this.applicationContext != null) {
61             ApplicationContext savedCtx;
62             
63             // We don't actually guarantee thread-safety, but it's not a lot of extra work.
64 synchronized (this) {
65                 savedCtx = this.applicationContext;
66                 this.applicationContext = null;
67             }
68
69             if (savedCtx != null && savedCtx instanceof ConfigurableApplicationContext) {
70                 ((ConfigurableApplicationContext) savedCtx).close();
71             }
72         }
73     }
74
75 }
76
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