| /* |
| * 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.ignite.spi.deployment.uri; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.util.Arrays; |
| import org.apache.ignite.internal.util.typedef.internal.S; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * Loads classes and resources from "unpacked" deployment archives. |
| * <p> |
| * Class loader scans package directory first and then if |
| * class/resource was not found scans all JAR files. |
| */ |
| class GridUriDeploymentClassLoader extends URLClassLoader { |
| /** |
| * Creates new instance of class loader. |
| * |
| * @param urls The URLs from which to load classes and resources. |
| * @param parent The parent class loader for delegation. |
| */ |
| GridUriDeploymentClassLoader(URL[] urls, ClassLoader parent) { |
| super(urls, parent); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { |
| // First, check if the class has already been loaded. |
| Class cls = findLoadedClass(name); |
| |
| if (cls == null) { |
| try { |
| try { |
| // Search classes in a deployment unit. |
| // NOTE: findClass(String) is not overridden since it is always called after |
| // findLoadedClass(String) in exclusive synchronization block. |
| cls = findClass(name); |
| } |
| catch (ClassNotFoundException ignored) { |
| // If still not found, then invoke parent class loader in order |
| // to find the class. |
| cls = super.loadClass(name, resolve); |
| } |
| } |
| catch (ClassNotFoundException e) { |
| throw e; |
| } |
| // Catch Throwable to secure against any errors resulted from |
| // corrupted class definitions or other user errors. |
| catch (Exception e) { |
| throw new ClassNotFoundException("Failed to load class due to unexpected error: " + name, e); |
| } |
| } |
| |
| return cls; |
| } |
| |
| /** |
| * Load class from a deployment unit. |
| * |
| * @param name Class name. |
| * @return Loaded class. |
| * @throws ClassNotFoundException If no class found. |
| */ |
| public synchronized Class<?> loadClassIsolated(String name) throws ClassNotFoundException { |
| // First, check if the class has already been loaded. |
| Class<?> cls = findLoadedClass(name); |
| |
| if (cls == null) { |
| try { |
| // Search classes in deployment unit. |
| // NOTE: findClass(String) is not overridden since it is always called after |
| // findLoadedClass(String) in exclusive synchronization block. |
| cls = findClass(name); |
| } |
| catch (ClassNotFoundException e) { |
| throw e; |
| } |
| // Catch Throwable to secure against any errors resulted from |
| // corrupted class definitions or other user errors. |
| catch (Exception e) { |
| throw new ClassNotFoundException("Failed to load class due to unexpected error: " + name, e); |
| } |
| } |
| |
| return cls; |
| } |
| |
| /** |
| * Load class from GAR file. |
| * |
| * @param name Class name. |
| * @return Loaded class. |
| * @throws ClassNotFoundException If no class found. |
| * @deprecated Use {@link GridUriDeploymentClassLoader#loadClassIsolated(String)} instead. |
| */ |
| @Deprecated |
| public synchronized Class<?> loadClassGarOnly(String name) throws ClassNotFoundException { |
| return loadClassIsolated(name); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public URL getResource(String name) { |
| URL url = findResource(name); |
| |
| if (url == null) |
| url = ClassLoader.getSystemResource(name); |
| |
| if (url == null) |
| url = super.getResource(name); |
| |
| return url; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public InputStream getResourceAsStream(String name) { |
| // Find resource in a deployment unit first. |
| InputStream in = getResourceAsStreamIsolated(name); |
| |
| // Find resource in parent class loader. |
| if (in == null) |
| in = ClassLoader.getSystemResourceAsStream(name); |
| |
| if (in == null) |
| in = super.getResourceAsStream(name); |
| |
| return in; |
| } |
| |
| /** |
| * Returns an input stream for reading the specified resource from a deployment unit only. |
| * |
| * @param name Resource name. |
| * @return An input stream for reading the resource, or {@code null} |
| * if the resource could not be found. |
| */ |
| @Nullable public InputStream getResourceAsStreamIsolated(String name) { |
| URL url = findResource(name); |
| |
| try { |
| return url != null ? url.openStream() : null; |
| } |
| catch (IOException ignored) { |
| return null; |
| } |
| } |
| |
| /** |
| * Returns an input stream for reading the specified resource from GAR file only. |
| * |
| * @param name Resource name. |
| * @return An input stream for reading the resource, or {@code null} |
| * if the resource could not be found. |
| * |
| * @deprecated Use {@link GridUriDeploymentClassLoader#getResourceAsStreamIsolated(String)} instead. |
| */ |
| @Deprecated |
| @Nullable public InputStream getResourceAsStreamGarOnly(String name) { |
| return getResourceAsStreamIsolated(name); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public String toString() { |
| return S.toString(GridUriDeploymentClassLoader.class, this, "urls", Arrays.toString(getURLs())); |
| } |
| } |