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Java > Open Source Codes > com > google > inject > example > ClientServiceWithFactories


1 /**
2  * Copyright (C) 2006 Google Inc.
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 com.google.inject.example;
18
19 import static junit.framework.Assert.assertTrue;
20
21 /**
22  * @author crazybob@google.com (Bob Lee)
23  */

24 public class ClientServiceWithFactories {
25
26 // 58 lines
27

28 public interface Service {
29   void go();
30 }
31
32 public static class ServiceImpl implements Service {
33   public void go() {
34     // ...
35
}
36 }
37
38 public static class ServiceFactory {
39
40   private ServiceFactory() {}
41
42   private static Service instance = new ServiceImpl();
43
44   public static Service getInstance() {
45     return instance;
46   }
47
48   public static void setInstance(Service service) {
49     instance = service;
50   }
51 }
52
53 public static class Client {
54
55   public void go() {
56     Service service = ServiceFactory.getInstance();
57     service.go();
58   }
59 }
60
61 public void testClient() {
62   Service previous = ServiceFactory.getInstance();
63   try {
64     final MockService mock = new MockService();
65     ServiceFactory.setInstance(mock);
66     Client client = new Client();
67     client.go();
68     assertTrue(mock.isGone());
69   }
70   finally {
71     ServiceFactory.setInstance(previous);
72   }
73 }
74
75 public static class MockService implements Service {
76
77   private boolean gone = false;
78
79   public void go() {
80     gone = true;
81   }
82
83   public boolean isGone() {
84     return gone;
85   }
86 }
87
88   public static void main(String JavaDoc[] args) {
89     new ClientServiceWithFactories().testClient();
90   }
91 }
92
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