001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018 package org.apache.commons.logging; 019 020 import junit.framework.*; 021 022 /** 023 * Test the ability to force the LogFactory class to use some 024 * arbitrary Hashtable implementation to store its mapping from 025 * context-classloader -> LogFactory object. 026 * <p> 027 * This is done by 028 */ 029 public class AltHashtableTestCase extends TestCase { 030 031 public static Test suite() throws Exception { 032 Class thisClass = AltHashtableTestCase.class; 033 ClassLoader thisClassLoader = thisClass.getClassLoader(); 034 035 PathableClassLoader loader = new PathableClassLoader(null); 036 loader.useExplicitLoader("junit.", thisClassLoader); 037 loader.addLogicalLib("testclasses"); 038 loader.addLogicalLib("commons-logging"); 039 040 Class testClass = loader.loadClass(thisClass.getName()); 041 return new PathableTestSuite(testClass, loader); 042 } 043 044 /** 045 * Set up before each test. 046 * <p> 047 * This method ensures that the appropriate system property is defined 048 * to force the LogFactory class to use the AltHashtable class as its 049 * Hashtable implementation for storing factories in. 050 * <p> 051 * This does make the assumption that whatever JVM we are running in 052 * doesn't initialise classes until they are actually referenced (ie the 053 * LogFactory class hasn't been initialised before this method is called). 054 * This is true of all JVMs I know of; and if it isn't then this test will 055 * fail and someone will tell us. 056 */ 057 public void setUp() { 058 System.setProperty( 059 "org.apache.commons.logging.LogFactory.HashtableImpl", 060 AltHashtable.class.getName()); 061 } 062 063 /** 064 * Verify that initialising the LogFactory class will cause it 065 * to instantiate an object of type specified in system property 066 * "org.apache.commons.logging.LogFactory.HashtableImpl". 067 */ 068 public void testType() { 069 // Here, the reference to the LogFactory class should cause the 070 // class to be loaded and initialised. It will see the property 071 // set and use the AltHashtable class. If other tests in this 072 // class have already been run within the same classloader then 073 // LogFactory will already have been initialised, but that 074 // doesn't change the effectiveness of this test. 075 assertTrue(LogFactory.factories instanceof AltHashtable); 076 } 077 078 /** 079 * Verify that when LogFactory sees a context-classloader for the 080 * first time that it creates a new entry in the LogFactory.factories 081 * hashmap. In particular, this checks that this process works ok when 082 * a system property has been used to specify an alternative Hashtable 083 * implementation for LogFactory to use. 084 */ 085 public void testPutCalled() throws Exception { 086 AltHashtable.lastKey = null; 087 AltHashtable.lastValue = null; 088 089 LogFactory.getLog(AltHashtableTestCase.class); 090 ClassLoader contextLoader = Thread.currentThread().getContextClassLoader(); 091 assertEquals(contextLoader, AltHashtable.lastKey); 092 assertNotNull(AltHashtable.lastValue); 093 } 094 }