org.apache.xbean.classloader.NonLockingJarFileClassLoader Maven / Gradle / Ivy

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/**
 * 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.xbean.classloader;

import java.io.File;
import java.io.IOException;
import java.lang.ref.SoftReference;
import java.net.URL;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.jar.JarFile;

import org.apache.xbean.classloader.UrlResourceFinder.JarFileFactory;

/**
 * A variation of {@link JarFileClassLoader} that never locks underlying JAR files, allowing JARs to be deleted even if
 * the ClassLoader is open.
 *
 * @author Phillip Webb
 */
public class NonLockingJarFileClassLoader extends JarFileClassLoader {

	private static final JarFileFactory JAR_FILE_FACTORY = new JarFileFactory() {

		private Map> jarFileCache = new HashMap>();

		public JarFile newJarFile(File file) throws IOException {
			SoftReference cached = jarFileCache.get(file);
			NonLockingJarFile rtn = (cached == null ? null : cached.get());
			if (rtn == null) {
				rtn = new NonLockingJarFile(file);
				jarFileCache.put(file, new SoftReference(rtn));
			}
			return rtn;
		}
	};

	public NonLockingJarFileClassLoader(String name, URL[] urls, ClassLoader parent, boolean inverseClassLoading,
			String[] hiddenClasses, String[] nonOverridableClasses) {
		super(name, urls, parent, inverseClassLoading, hiddenClasses, nonOverridableClasses);
	}

	public NonLockingJarFileClassLoader(String name, URL[] urls, ClassLoader parent) {
		super(name, urls, parent);
	}

	public NonLockingJarFileClassLoader(String name, URL[] urls, ClassLoader[] parents, boolean inverseClassLoading,
			Collection hiddenClasses, Collection nonOverridableClasses) {
		super(name, urls, parents, inverseClassLoading, hiddenClasses, nonOverridableClasses);
	}

	public NonLockingJarFileClassLoader(String name, URL[] urls, ClassLoader[] parents, boolean inverseClassLoading,
			String[] hiddenClasses, String[] nonOverridableClasses) {
		super(name, urls, parents, inverseClassLoading, hiddenClasses, nonOverridableClasses);
	}

	public NonLockingJarFileClassLoader(String name, URL[] urls, ClassLoader[] parents) {
		super(name, urls, parents);
	}

	public NonLockingJarFileClassLoader(String name, URL[] urls) {
		super(name, urls);
	}

	protected UrlResourceFinder newResourceFinder() {
		return new UrlResourceFinder(JAR_FILE_FACTORY);
	}
}