ClassLoaders.java

/**
 *  Copyright 2005-2016 Red Hat, Inc.
 *
 *  Red Hat 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 io.fabric8.utils;

import java.util.concurrent.Callable;

/**
 */
public class ClassLoaders {

    /**
     * Invokes the given {@link Callable} while the thread context class loader is set to the given class loader
     *
     * @return the result of the {@link java.util.concurrent.Callable#call()} method
     */
    public static <T> T withContextClassLoader(ClassLoader classLoader, Callable<T> callable) throws Exception {
        ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
        try {
            Thread.currentThread().setContextClassLoader(classLoader);
            return callable.call();
        } finally {
            Thread.currentThread().setContextClassLoader(oldClassLoader);
        }
    }
}