1   /*
2    * Copyright 2004 The Apache Software Foundation.
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.apache.commons.configuration.reloading;
18  
19  import java.io.File;
20  import java.io.FileWriter;
21  import java.net.URL;
22  
23  import junit.framework.TestCase;
24  import org.apache.commons.configuration.PropertiesConfiguration;
25  import org.apache.commons.configuration.XMLConfiguration;
26  
27  /***
28   * Test case for the ReloadableConfiguration class.
29   *
30   * @author Emmanuel Bourg
31   * @version $Revision$, $Date: 2005-11-11 17:46:54 +0100 (Fri, 11 Nov 2005) $
32   */
33  public class TestFileChangedReloadingStrategy extends TestCase
34  {
35      public void testAutomaticReloading() throws Exception
36      {
37          // create a new configuration
38          File file = new File("target/testReload.properties");
39  
40          if (file.exists())
41          {
42              file.delete();
43          }
44  
45          // create the configuration file
46          FileWriter out = new FileWriter(file);
47          out.write("string=value1");
48          out.flush();
49          out.close();
50  
51          // load the configuration
52          PropertiesConfiguration config = new PropertiesConfiguration("target/testReload.properties");
53          FileChangedReloadingStrategy strategy = new FileChangedReloadingStrategy();
54          strategy.setRefreshDelay(500);
55          config.setReloadingStrategy(strategy);
56          assertEquals("Initial value", "value1", config.getString("string"));
57  
58          Thread.sleep(2000);
59  
60          // change the file
61          out = new FileWriter(file);
62          out.write("string=value2");
63          out.flush();
64          out.close();
65  
66          // test the automatic reloading
67          assertEquals("Modified value with enabled reloading", "value2", config.getString("string"));
68      }
69  
70      public void testNewFileReloading() throws Exception
71      {
72          // create a new configuration
73          File file = new File("target/testReload.properties");
74  
75          if (file.exists())
76          {
77              file.delete();
78          }
79  
80          PropertiesConfiguration config = new PropertiesConfiguration();
81          config.setFile(file);
82          FileChangedReloadingStrategy strategy = new FileChangedReloadingStrategy();
83          strategy.setRefreshDelay(500);
84          config.setReloadingStrategy(strategy);
85  
86          assertNull("Initial value", config.getString("string"));
87  
88          // change the file
89          FileWriter out = new FileWriter(file);
90          out.write("string=value1");
91          out.flush();
92          out.close();
93  
94          Thread.sleep(2000);
95  
96          // test the automatic reloading
97          assertEquals("Modified value with enabled reloading", "value1", config.getString("string"));
98      }
99  
100     public void testGetRefreshDelay()
101     {
102         FileChangedReloadingStrategy strategy = new FileChangedReloadingStrategy();
103         strategy.setRefreshDelay(500);
104         assertEquals("refresh delay", 500, strategy.getRefreshDelay());
105     }
106 
107     /***
108      * Tests if a file from the classpath can be monitored.
109      */
110     public void testFromClassPath() throws Exception
111     {
112         PropertiesConfiguration config = new PropertiesConfiguration();
113         config.setFileName("test.properties");
114         config.load();
115         assertTrue(config.getBoolean("configuration.loaded"));
116         FileChangedReloadingStrategy strategy = new FileChangedReloadingStrategy();
117         config.setReloadingStrategy(strategy);
118         assertEquals(config.getURL(), strategy.getFile().toURL());
119     }
120     
121     /***
122      * Tests to watch a configuration file in a jar. In this case the jar file
123      * itself should be monitored.
124      */
125     public void testFromJar() throws Exception
126     {
127         XMLConfiguration config = new XMLConfiguration();
128         // use some jar: URL
129         config.setURL(new URL("jar:" + new File("conf/resources.jar").getAbsoluteFile().toURL() + "!/test-jar.xml"));
130         FileChangedReloadingStrategy strategy = new FileChangedReloadingStrategy();
131         config.setReloadingStrategy(strategy);
132         File file = strategy.getFile();
133         assertNotNull("Strategy's file is null", file);
134         assertEquals("Strategy does not monitor the jar file", "resources.jar", file.getName());
135     }
136 }