mirror of https://github.com/apache/cassandra
108 lines
3.5 KiB
Java
108 lines
3.5 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.cassandra;
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import java.io.IOException;
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import java.net.URLClassLoader;
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import java.util.function.Predicate;
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import org.junit.runners.BlockJUnit4ClassRunner;
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import org.junit.runners.model.InitializationError;
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import org.apache.cassandra.distributed.impl.AbstractCluster;
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/**
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*
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* This class is usually used to test singletons. It ensure singletons can be unique in each test case.
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*
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*/
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public class CassandraIsolatedJunit4ClassRunner extends BlockJUnit4ClassRunner
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{
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private static final Predicate<String> isolatedPackage = name ->
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name.startsWith("org.apache.cassandra.") ||
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// YAML could not be shared because
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// org.apache.cassandra.config.Config is loaded by org.yaml.snakeyaml.YAML
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name.startsWith("org.yaml.snakeyaml.");
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/**
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* Creates a CassandraIsolatedJunit4ClassRunner to run {@code klass}
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*
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* @param clazz
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* @throws InitializationError if the test class is malformed.
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*/
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public CassandraIsolatedJunit4ClassRunner(Class<?> clazz) throws InitializationError
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{
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super(createClassLoader(clazz));
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}
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private static Class<?> createClassLoader(Class<?> clazz) throws InitializationError {
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try {
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ClassLoader testClassLoader = new CassandraIsolatedClassLoader();
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return Class.forName(clazz.getName(), true, testClassLoader);
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} catch (ClassNotFoundException e) {
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throw new InitializationError(e);
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}
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}
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public static class CassandraIsolatedClassLoader extends URLClassLoader
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{
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public CassandraIsolatedClassLoader()
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{
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super(AbstractCluster.CURRENT_VERSION.classpath);
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}
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@Override
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public Class<?> loadClass(String name) throws ClassNotFoundException
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{
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if (isolatedPackage.test(name))
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{
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synchronized (getClassLoadingLock(name))
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{
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// First, check if the class has already been loaded
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Class<?> c = findLoadedClass(name);
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if (c == null)
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c = findClass(name);
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return c;
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}
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}
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else
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{
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return super.loadClass(name);
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}
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}
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protected void finalize()
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{
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try
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{
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close();
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}
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catch (IOException e)
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{
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e.printStackTrace();
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}
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}
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}
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}
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