| /** |
| * 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.yarn.util; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Splitter; |
| |
| import java.io.File; |
| import java.io.FilenameFilter; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience.Public; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| |
| /** |
| * A {@link URLClassLoader} for YARN application isolation. Classes from |
| * the application JARs are loaded in preference to the parent loader. |
| */ |
| @Public |
| @Unstable |
| public class ApplicationClassLoader extends URLClassLoader { |
| |
| private static final Log LOG = |
| LogFactory.getLog(ApplicationClassLoader.class.getName()); |
| |
| private static final FilenameFilter JAR_FILENAME_FILTER = |
| new FilenameFilter() { |
| @Override |
| public boolean accept(File dir, String name) { |
| return name.endsWith(".jar") || name.endsWith(".JAR"); |
| } |
| }; |
| |
| private ClassLoader parent; |
| private List<String> systemClasses; |
| |
| public ApplicationClassLoader(URL[] urls, ClassLoader parent, |
| List<String> systemClasses) { |
| super(urls, parent); |
| this.parent = parent; |
| if (parent == null) { |
| throw new IllegalArgumentException("No parent classloader!"); |
| } |
| this.systemClasses = systemClasses; |
| } |
| |
| public ApplicationClassLoader(String classpath, ClassLoader parent, |
| List<String> systemClasses) throws MalformedURLException { |
| this(constructUrlsFromClasspath(classpath), parent, systemClasses); |
| } |
| |
| @VisibleForTesting |
| static URL[] constructUrlsFromClasspath(String classpath) |
| throws MalformedURLException { |
| List<URL> urls = new ArrayList<URL>(); |
| for (String element : Splitter.on(File.pathSeparator).split(classpath)) { |
| if (element.endsWith("/*")) { |
| String dir = element.substring(0, element.length() - 1); |
| File[] files = new File(dir).listFiles(JAR_FILENAME_FILTER); |
| if (files != null) { |
| for (File file : files) { |
| urls.add(file.toURI().toURL()); |
| } |
| } |
| } else { |
| File file = new File(element); |
| if (file.exists()) { |
| urls.add(new File(element).toURI().toURL()); |
| } |
| } |
| } |
| return urls.toArray(new URL[urls.size()]); |
| } |
| |
| @Override |
| public URL getResource(String name) { |
| URL url = null; |
| |
| if (!isSystemClass(name, systemClasses)) { |
| url= findResource(name); |
| if (url == null && name.startsWith("/")) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Remove leading / off " + name); |
| } |
| url= findResource(name.substring(1)); |
| } |
| } |
| |
| if (url == null) { |
| url= parent.getResource(name); |
| } |
| |
| if (url != null) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("getResource("+name+")=" + url); |
| } |
| } |
| |
| return url; |
| } |
| |
| @Override |
| public Class<?> loadClass(String name) throws ClassNotFoundException { |
| return this.loadClass(name, false); |
| } |
| |
| @Override |
| protected synchronized Class<?> loadClass(String name, boolean resolve) |
| throws ClassNotFoundException { |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Loading class: " + name); |
| } |
| |
| Class<?> c = findLoadedClass(name); |
| ClassNotFoundException ex = null; |
| |
| if (c == null && !isSystemClass(name, systemClasses)) { |
| // Try to load class from this classloader's URLs. Note that this is like |
| // the servlet spec, not the usual Java 2 behaviour where we ask the |
| // parent to attempt to load first. |
| try { |
| c = findClass(name); |
| if (LOG.isDebugEnabled() && c != null) { |
| LOG.debug("Loaded class: " + name + " "); |
| } |
| } catch (ClassNotFoundException e) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug(e); |
| } |
| ex = e; |
| } |
| } |
| |
| if (c == null) { // try parent |
| c = parent.loadClass(name); |
| if (LOG.isDebugEnabled() && c != null) { |
| LOG.debug("Loaded class from parent: " + name + " "); |
| } |
| } |
| |
| if (c == null) { |
| throw ex != null ? ex : new ClassNotFoundException(name); |
| } |
| |
| if (resolve) { |
| resolveClass(c); |
| } |
| |
| return c; |
| } |
| |
| @VisibleForTesting |
| static boolean isSystemClass(String name, List<String> systemClasses) { |
| if (systemClasses != null) { |
| String canonicalName = name.replace('/', '.'); |
| while (canonicalName.startsWith(".")) { |
| canonicalName=canonicalName.substring(1); |
| } |
| for (String c : systemClasses) { |
| boolean result = true; |
| if (c.startsWith("-")) { |
| c = c.substring(1); |
| result = false; |
| } |
| if (c.endsWith(".") && canonicalName.startsWith(c)) { |
| return result; |
| } else if (canonicalName.equals(c)) { |
| return result; |
| } |
| } |
| } |
| return false; |
| } |
| } |