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org.perfectjpattern.jee.business.servicelocator.TestServiceLocator.testServiceLocator
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org.perfectjpattern.jee.integration.dao.jpa.TestExample.testJpaCmpGenericDao
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1 | //---------------------------------------------------------------------- | |
2 | // | |
3 | // PerfectJPattern: "Design patterns are good but components are better!" | |
4 | // ServiceLocator.java Copyright (c) 2009 Giovanni Azua Garcia | |
5 | // bravegag@hotmail.com | |
6 | // | |
7 | // This program is free software; you can redistribute it and/or | |
8 | // modify it under the terms of the GNU General Public License | |
9 | // as published by the Free Software Foundation; either version 3 | |
10 | // of the License, or (at your option) any later version. | |
11 | // | |
12 | // This program is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | // | |
17 | // You should have received a copy of the GNU General Public License | |
18 | // along with this program; if not, see <http://www.gnu.org/licenses/>. | |
19 | // | |
20 | //---------------------------------------------------------------------- | |
21 | package org.perfectjpattern.jee.business.servicelocator; | |
22 | ||
23 | import java.util.*; | |
24 | ||
25 | import javax.naming.*; | |
26 | ||
27 | import org.perfectjpattern.core.api.creational.singleton.*; | |
28 | import org.perfectjpattern.jee.api.business.servicelocator.*; | |
29 | ||
30 | /** | |
31 | * Generic componentized implementation of {@link IServiceLocator}. Provides | |
32 | * concrete {@link IServiceLocator} implementations with reusable JNDI service | |
33 | * lookup and Services caching. | |
34 | * <br/><br/> | |
35 | * Note that all initial properties are loaded from the <code>jndi.properties | |
36 | * </code> file | |
37 | * | |
38 | * @author <a href="mailto:bravegag@hotmail.com">Giovanni Azua</a> | |
39 | * @version $Revision: 1.0 $Date: Feb 7, 2009 2:35:20 PM $ | |
40 | */ | |
41 | public final | |
42 | class ServiceLocator | |
43 | implements IServiceLocator, ISingleton | |
44 | { | |
45 | //------------------------------------------------------------------------ | |
46 | // public | |
47 | //------------------------------------------------------------------------ | |
48 | /** | |
49 | * Returns Singleton instance of {@link IServiceLocator} | |
50 | * | |
51 | * @return Singleton instance of {@link IServiceLocator} | |
52 | */ | |
53 | 2 |
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54 | getInstance() | |
55 | { | |
56 | 2 | return INSTANCE; |
57 | } | |
58 | ||
59 | //------------------------------------------------------------------------ | |
60 | /** | |
61 | * {@inheritDoc} | |
62 | */ | |
63 | 5 |
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64 | public <S> S | |
65 | locate(String aName) | |
66 | throws IllegalArgumentException | |
67 | { | |
68 | 5 | S myService = null; |
69 | ||
70 | 5 | if (theServiceCache.containsKey(aName)) |
71 | { | |
72 | 1 | myService = (S) theServiceCache.get(aName); |
73 | } | |
74 | else | |
75 | { | |
76 | 4 | try |
77 | { | |
78 | 4 | myService = (S) theContext.lookup(aName); |
79 | ||
80 | assert myService != null : "'myService' must not be null"; | |
81 | ||
82 | // save in cache | |
83 | 3 | theServiceCache.put(aName, myService); |
84 | } | |
85 | catch (NamingException anException) | |
86 | { | |
87 | // propagate the exception | |
88 | throw new ServiceLocatorException(anException); | |
89 | } | |
90 | } | |
91 | ||
92 | 4 | return myService; |
93 | } | |
94 | ||
95 | //------------------------------------------------------------------------ | |
96 | /** | |
97 | * {@inheritDoc} | |
98 | */ | |
99 | 2 |
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100 | shutdown() | |
101 | throws ServiceLocatorException | |
102 | { | |
103 | 2 | try |
104 | { | |
105 | 2 | theContext.close(); |
106 | } | |
107 | catch (NamingException anException) | |
108 | { | |
109 | // propagate the exception | |
110 | throw new ServiceLocatorException(anException); | |
111 | } | |
112 | } | |
113 | ||
114 | //------------------------------------------------------------------------ | |
115 | // private | |
116 | //------------------------------------------------------------------------ | |
117 | 2 |
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118 | ServiceLocator() | |
119 | { | |
120 | 2 | try |
121 | { | |
122 | 2 | theContext = new InitialContext(); |
123 | } | |
124 | catch (NamingException anException) | |
125 | { | |
126 | // propagate the exception | |
127 | throw new ServiceLocatorException(anException); | |
128 | } | |
129 | } | |
130 | ||
131 | //------------------------------------------------------------------------ | |
132 | // members | |
133 | //------------------------------------------------------------------------ | |
134 | private static final IServiceLocator INSTANCE = new ServiceLocator(); | |
135 | private final Context theContext; | |
136 | private final Map<String, Object> theServiceCache = | |
137 | new HashMap<String, Object>(); | |
138 | } |
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