001    /**
002     * Copyright 2005-2011 The Kuali Foundation
003     *
004     * Licensed under the Educational Community License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.opensource.org/licenses/ecl2.php
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.kuali.rice.kew.plugin;
017    
018    import org.junit.Test;
019    import org.kuali.rice.core.api.util.ContextClassLoaderBinder;
020    
021    import java.net.URL;
022    import java.net.URLClassLoader;
023    
024    import static org.junit.Assert.assertEquals;
025    import static org.junit.Assert.fail;
026    
027    /**
028     * Tests the ContextClassLoaderBinder
029     * @author Kuali Rice Team (rice.collab@kuali.org)
030     */
031    public class ContextClassLoaderBinderTest {
032        
033            @Test public void testBinding() {
034            try {
035                ContextClassLoaderBinder.unbind();
036                fail("unbind succeeded without any prior bind");
037            } catch (IllegalStateException ise) {
038                // expect illegal state
039            }
040    
041            ClassLoader cl0 = new URLClassLoader(new URL[] {});
042            ClassLoader cl1 = new URLClassLoader(new URL[] {});
043            ClassLoader cl2 = new URLClassLoader(new URL[] {});
044    
045            ClassLoader original = Thread.currentThread().getContextClassLoader();
046            ContextClassLoaderBinder.bind(cl0);
047            assertEquals(cl0, Thread.currentThread().getContextClassLoader());
048            ContextClassLoaderBinder.unbind();
049            assertEquals(original, Thread.currentThread().getContextClassLoader());
050    
051            ContextClassLoaderBinder.bind(cl0);
052            assertEquals(cl0, Thread.currentThread().getContextClassLoader());
053            ContextClassLoaderBinder.bind(cl1);
054            assertEquals(cl1, Thread.currentThread().getContextClassLoader());
055            ContextClassLoaderBinder.unbind();
056            assertEquals(cl0, Thread.currentThread().getContextClassLoader());
057            ContextClassLoaderBinder.unbind();
058            assertEquals(original, Thread.currentThread().getContextClassLoader());
059    
060            ContextClassLoaderBinder.bind(cl0);
061            assertEquals(cl0, Thread.currentThread().getContextClassLoader());
062            ContextClassLoaderBinder.bind(cl1);
063            assertEquals(cl1, Thread.currentThread().getContextClassLoader());
064            ContextClassLoaderBinder.bind(cl2);
065            assertEquals(cl2, Thread.currentThread().getContextClassLoader());
066            ContextClassLoaderBinder.unbind();
067            assertEquals(cl1, Thread.currentThread().getContextClassLoader());
068            ContextClassLoaderBinder.unbind();
069            assertEquals(cl0, Thread.currentThread().getContextClassLoader());
070            ContextClassLoaderBinder.unbind();
071            assertEquals(original, Thread.currentThread().getContextClassLoader());
072        }
073    }