1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.logging;
19
20 import junit.framework.*;
21
22 /**
23 * Test the ability to force the LogFactory class to use some
24 * arbitrary Hashtable implementation to store its mapping from
25 * context-classloader -> LogFactory object.
26 * <p>
27 * This is done by
28 */
29 public class AltHashtableTestCase extends TestCase {
30
31 public static Test suite() throws Exception {
32 Class thisClass = AltHashtableTestCase.class;
33 ClassLoader thisClassLoader = thisClass.getClassLoader();
34
35 PathableClassLoader loader = new PathableClassLoader(null);
36 loader.useExplicitLoader("junit.", thisClassLoader);
37 loader.addLogicalLib("testclasses");
38 loader.addLogicalLib("commons-logging");
39
40 Class testClass = loader.loadClass(thisClass.getName());
41 return new PathableTestSuite(testClass, loader);
42 }
43
44 /**
45 * Set up before each test.
46 * <p>
47 * This method ensures that the appropriate system property is defined
48 * to force the LogFactory class to use the AltHashtable class as its
49 * Hashtable implementation for storing factories in.
50 * <p>
51 * This does make the assumption that whatever JVM we are running in
52 * doesn't initialise classes until they are actually referenced (ie the
53 * LogFactory class hasn't been initialised before this method is called).
54 * This is true of all JVMs I know of; and if it isn't then this test will
55 * fail and someone will tell us.
56 */
57 public void setUp() {
58 System.setProperty(
59 "org.apache.commons.logging.LogFactory.HashtableImpl",
60 AltHashtable.class.getName());
61 }
62
63 /**
64 * Verify that initialising the LogFactory class will cause it
65 * to instantiate an object of type specified in system property
66 * "org.apache.commons.logging.LogFactory.HashtableImpl".
67 */
68 public void testType() {
69 // Here, the reference to the LogFactory class should cause the
70 // class to be loaded and initialised. It will see the property
71 // set and use the AltHashtable class. If other tests in this
72 // class have already been run within the same classloader then
73 // LogFactory will already have been initialised, but that
74 // doesn't change the effectiveness of this test.
75 assertTrue(LogFactory.factories instanceof AltHashtable);
76 }
77
78 /**
79 * Verify that when LogFactory sees a context-classloader for the
80 * first time that it creates a new entry in the LogFactory.factories
81 * hashmap. In particular, this checks that this process works ok when
82 * a system property has been used to specify an alternative Hashtable
83 * implementation for LogFactory to use.
84 */
85 public void testPutCalled() throws Exception {
86 AltHashtable.lastKey = null;
87 AltHashtable.lastValue = null;
88
89 LogFactory.getLog(AltHashtableTestCase.class);
90 ClassLoader contextLoader = Thread.currentThread().getContextClassLoader();
91 assertEquals(contextLoader, AltHashtable.lastKey);
92 assertNotNull(AltHashtable.lastValue);
93 }
94 }