hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/ClassLoaderCheck.java

/**
 * 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.hadoop.util;

public class ClassLoaderCheck {
  /**
   * Verifies the class is loaded by the right classloader.
   */
  public static void checkClassLoader(Class cls,
      boolean shouldBeLoadedByAppClassLoader) {
    boolean loadedByAppClassLoader =
        cls.getClassLoader() instanceof ApplicationClassLoader;
    if ((shouldBeLoadedByAppClassLoader && !loadedByAppClassLoader) ||
        (!shouldBeLoadedByAppClassLoader && loadedByAppClassLoader)) {
      throw new RuntimeException("incorrect classloader used");
    }
  }
}