| /* |
| * Derby - Class org.apache.derbyTesting.junit.ClassLoaderTestSetup |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, |
| * either express or implied. See the License for the specific |
| * language governing permissions and limitations under the License. |
| */ |
| |
| package org.apache.derbyTesting.junit; |
| |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import junit.framework.Test; |
| |
| /** |
| * A decorator that changes the context class loader for the current |
| * configuration and resets it afterwards. |
| */ |
| public class ClassLoaderTestSetup extends BaseJDBCTestSetup { |
| |
| private ClassLoader oldLoader; |
| |
| /** |
| * Create a decorator that makes {@code test} run with non-default |
| * class loader. It also shuts down the engine so Derby classes will |
| * be loaded with the new class loader. |
| * |
| * @param test the test to decorate |
| */ |
| public ClassLoaderTestSetup(Test test) { |
| super(test); |
| } |
| |
| private static ClassLoader makeClassLoader() { |
| PrivilegedAction<ClassLoader> pa = () -> new URLClassLoader(new URL[0]); |
| return AccessController.doPrivileged(pa); |
| } |
| |
| @Override |
| protected void setUp() throws Exception { |
| super.setUp(); |
| TestConfiguration.getCurrent().shutdownEngine(); |
| oldLoader = getThreadLoader(); |
| setThreadLoader(makeClassLoader()); |
| } |
| |
| @Override |
| protected void tearDown() throws Exception { |
| setThreadLoader(oldLoader); |
| super.tearDown(); |
| } |
| |
| /** |
| * Force this thread to use a specific class loader. |
| * @param which class loader to set |
| * |
| * @throws SecurityException |
| * if the current thread cannot set the context ClassLoader |
| */ |
| public static void setThreadLoader(final ClassLoader which) { |
| AccessController.doPrivileged(new PrivilegedAction<Void>() { |
| @Override |
| public Void run() { |
| java.lang.Thread.currentThread().setContextClassLoader(which); |
| return null; |
| } |
| }); |
| } |
| |
| /** |
| * <p> |
| * Retrieve the class loader currently being used by this thread. |
| * </p> |
| * @return the current context class loader |
| */ |
| public static ClassLoader getThreadLoader() { |
| return AccessController.doPrivileged( |
| new PrivilegedAction<ClassLoader>() { |
| public ClassLoader run() { |
| return Thread.currentThread().getContextClassLoader(); |
| } |
| }); |
| } |
| |
| } |