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Java > Open Source Codes > org > apache > commons > logging > tccl > log > TcclEnabledTestCase


1 /*
2  * Copyright 2006 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.tccl.log;
18
19
20 import java.net.URL JavaDoc;
21
22 import junit.framework.Test;
23 import junit.framework.TestCase;
24
25 import org.apache.commons.logging.Log;
26 import org.apache.commons.logging.LogFactory;
27 import org.apache.commons.logging.PathableClassLoader;
28 import org.apache.commons.logging.PathableTestSuite;
29
30
31 /**
32  * Verify that by default the standard LogFactoryImpl class loads a
33  * custom Log implementation via the TCCL.
34  */
35
36 public class TcclEnabledTestCase extends TestCase {
37
38     public static final String JavaDoc MY_LOG_PKG =
39         "org.apache.commons.logging.tccl.custom";
40
41     public static final String JavaDoc MY_LOG_IMPL =
42         MY_LOG_PKG + ".MyLog";
43
44     // ------------------------------------------- JUnit Infrastructure Methods
45
46     /**
47      * Return the tests included in this test suite.
48      */
49     public static Test suite() throws Exception JavaDoc {
50         Class JavaDoc thisClass = TcclEnabledTestCase.class;
51
52         // Determine the URL to this .class file, so that we can then
53 // append the priority dirs to it. For tidiness, load this
54 // class through a dummy loader though this is not absolutely
55 // necessary...
56 PathableClassLoader dummy = new PathableClassLoader(null);
57         dummy.useSystemLoader("junit.");
58         dummy.addLogicalLib("testclasses");
59         dummy.addLogicalLib("commons-logging");
60         
61         String JavaDoc thisClassPath = thisClass.getName().replace('.', '/') + ".class";
62         URL JavaDoc baseUrl = dummy.findResource(thisClassPath);
63
64         // Now set up the desired classloader hierarchy. Everything goes into
65 // the parent classpath, but we exclude the custom Log class.
66 //
67 // We then create a tccl classloader that can see the custom
68 // Log class. Therefore if that class can be found, then the
69 // TCCL must have been used to load it.
70 PathableClassLoader emptyLoader = new PathableClassLoader(null);
71         
72         PathableClassLoader parentLoader = new PathableClassLoader(null);
73         parentLoader.useSystemLoader("junit.");
74         parentLoader.addLogicalLib("commons-logging");
75         parentLoader.addLogicalLib("testclasses");
76         // hack to ensure that the testcase classloader can't see
77 // the custom MyLogFactoryImpl
78 parentLoader.useExplicitLoader(MY_LOG_PKG + ".", emptyLoader);
79         
80         URL JavaDoc propsEnableUrl = new URL JavaDoc(baseUrl, "props_enable_tccl/");
81         parentLoader.addURL(propsEnableUrl);
82
83         PathableClassLoader tcclLoader = new PathableClassLoader(parentLoader);
84         tcclLoader.addLogicalLib("testclasses");
85
86         Class JavaDoc testClass = parentLoader.loadClass(thisClass.getName());
87         return new PathableTestSuite(testClass, tcclLoader);
88     }
89
90     /**
91      * Set up instance variables required by this test case.
92      */
93     public void setUp() throws Exception JavaDoc {
94         LogFactory.releaseAll();
95     }
96
97     /**
98      * Tear down instance variables required by this test case.
99      */
100     public void tearDown() {
101         LogFactory.releaseAll();
102     }
103
104     // ----------------------------------------------------------- Test Methods
105
106     /**
107      * Verify that MyLogFactoryImpl is only loadable via the tccl.
108      */
109     public void testLoader() throws Exception JavaDoc {
110         
111         ClassLoader JavaDoc thisClassLoader = this.getClass().getClassLoader();
112         ClassLoader JavaDoc tcclLoader = Thread.currentThread().getContextClassLoader();
113         
114         // the tccl loader should NOT be the same as the loader that loaded this test class.
115 assertNotSame("tccl not same as test classloader", thisClassLoader, tcclLoader);
116
117         // MyLog should not be loadable via parent loader
118 try {
119             Class JavaDoc clazz = thisClassLoader.loadClass(MY_LOG_IMPL);
120             fail("Unexpectedly able to load MyLog via test class classloader");
121         } catch(ClassNotFoundException JavaDoc ex) {
122             // ok, expected
123 }
124         
125         // MyLog should be loadable via tccl loader
126 try {
127             Class JavaDoc clazz = tcclLoader.loadClass(MY_LOG_IMPL);
128         } catch(ClassNotFoundException JavaDoc ex) {
129             fail("Unexpectedly unable to load MyLog via tccl classloader");
130         }
131     }
132
133     /**
134      * Verify that the custom Log implementation which is only accessable
135      * via the TCCL has successfully been loaded as specified in the config file.
136      * This proves that the TCCL was used to load that class.
137      */
138     public void testTcclLoading() throws Exception JavaDoc {
139         LogFactory instance = LogFactory.getFactory();
140         
141         assertEquals(
142             "Correct LogFactory loaded",
143             "org.apache.commons.logging.impl.LogFactoryImpl",
144             instance.getClass().getName());
145
146         Log log = instance.getLog("test");
147         assertEquals(
148             "Correct Log loaded",
149             MY_LOG_IMPL,
150             log.getClass().getName());
151     }
152 }
153
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