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Java > Open Source Codes > org > apache > commons > logging > AltHashtableTestCase


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.logging;
18
19 import junit.framework.*;
20
21 /**
22  * Test the ability to force the LogFactory class to use some
23  * arbitrary Hashtable implementation to store its mapping from
24  * context-classloader -> LogFactory object.
25  * <p>
26  * This is done by
27  */
28 public class AltHashtableTestCase extends TestCase {
29
30     public static Test suite() throws Exception JavaDoc {
31         Class JavaDoc thisClass = AltHashtableTestCase.class;
32         ClassLoader JavaDoc thisClassLoader = thisClass.getClassLoader();
33
34         PathableClassLoader loader = new PathableClassLoader(null);
35         loader.useExplicitLoader("junit.", thisClassLoader);
36         loader.addLogicalLib("testclasses");
37         loader.addLogicalLib("commons-logging");
38
39         Class JavaDoc testClass = loader.loadClass(thisClass.getName());
40         return new PathableTestSuite(testClass, loader);
41     }
42
43     /**
44      * Set up before each test.
45      * <p>
46      * This method ensures that the appropriate system property is defined
47      * to force the LogFactory class to use the AltHashtable class as its
48      * Hashtable implementation for storing factories in.
49      * <p>
50      * This does make the assumption that whatever JVM we are running in
51      * doesn't initialise classes until they are actually referenced (ie the
52      * LogFactory class hasn't been initialised before this method is called).
53      * This is true of all JVMs I know of; and if it isn't then this test will
54      * fail and someone will tell us.
55      */
56     public void setUp() {
57         System.setProperty(
58                 "org.apache.commons.logging.LogFactory.HashtableImpl",
59                 AltHashtable.class.getName());
60     }
61     
62     /**
63      * Verify that initialising the LogFactory class will cause it
64      * to instantiate an object of type specified in system property
65      * "org.apache.commons.logging.LogFactory.HashtableImpl".
66      */
67     public void testType() {
68         // Here, the reference to the LogFactory class should cause the
69 // class to be loaded and initialised. It will see the property
70 // set and use the AltHashtable class. If other tests in this
71 // class have already been run within the same classloader then
72 // LogFactory will already have been initialised, but that
73 // doesn't change the effectiveness of this test.
74 assertTrue(LogFactory.factories instanceof AltHashtable);
75     }
76     
77     /**
78      * Verify that when LogFactory sees a context-classloader for the
79      * first time that it creates a new entry in the LogFactory.factories
80      * hashmap. In particular, this checks that this process works ok when
81      * a system property has been used to specify an alternative Hashtable
82      * implementation for LogFactory to use.
83      */
84     public void testPutCalled() throws Exception JavaDoc {
85         AltHashtable.lastKey = null;
86         AltHashtable.lastValue = null;
87         
88         LogFactory.getLog(AltHashtableTestCase.class);
89         ClassLoader JavaDoc contextLoader = Thread.currentThread().getContextClassLoader();
90         assertEquals(contextLoader, AltHashtable.lastKey);
91         assertNotNull(AltHashtable.lastValue);
92     }
93 }
94
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