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/*
* 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();
}
});
}
}
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