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.Test;
21 import junit.framework.TestCase;
22
23 /**
24 * Test the ability to force the LogFactory class to use some
25 * arbitrary Hashtable implementation to store its mapping from
26 * context class loader -> LogFactory object.
27 */
28 public class AltHashtableTestCase extends TestCase {
29
30 public static Test suite() throws Exception {
31 final Class thisClass = AltHashtableTestCase.class;
32 final ClassLoader thisClassLoader = thisClass.getClassLoader();
33
34 final PathableClassLoader loader = new PathableClassLoader(null);
35 loader.useExplicitLoader("junit.", thisClassLoader);
36 loader.addLogicalLib("testclasses");
37 loader.addLogicalLib("commons-logging");
38
39 final Class testClass = loader.loadClass(thisClass.getName());
40 return new PathableTestSuite(testClass, loader);
41 }
42
43 /**
44 * Sets 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 initialize classes until they are actually referenced (ie the
52 * LogFactory class hasn't been initialized 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 @Override
57 public void setUp() {
58 System.setProperty(
59 "org.apache.commons.logging.LogFactory.HashtableImpl",
60 AltHashtable.class.getName());
61 }
62
63 /**
64 * Verify that when LogFactory sees a context class loader for the
65 * first time that it creates a new entry in the LogFactory.factories
66 * hashmap. In particular, this checks that this process works ok when
67 * a system property has been used to specify an alternative Hashtable
68 * implementation for LogFactory to use.
69 */
70 public void testPutCalled() throws Exception {
71 AltHashtable.lastKey = null;
72 AltHashtable.lastValue = null;
73
74 LogFactory.getLog(AltHashtableTestCase.class);
75 final ClassLoader contextLoader = Thread.currentThread().getContextClassLoader();
76 assertEquals(contextLoader, AltHashtable.lastKey);
77 assertNotNull(AltHashtable.lastValue);
78 }
79
80 /**
81 * Verify that initialising the LogFactory class will cause it
82 * to instantiate an object of type specified in system property
83 * "org.apache.commons.logging.LogFactory.HashtableImpl".
84 */
85 public void testType() {
86 // Here, the reference to the LogFactory class should cause the
87 // class to be loaded and initialized. It will see the property
88 // set and use the AltHashtable class. If other tests in this
89 // class have already been run within the same class loader then
90 // LogFactory will already have been initialized, but that
91 // doesn't change the effectiveness of this test.
92 assertTrue(LogFactory.factories instanceof AltHashtable);
93 }
94 }