mirror of
https://github.com/honeymoose/OpenSearch.git
synced 2025-03-26 01:48:45 +00:00
a19b77484e
Each plugin is now loaded in its own classloader to prevent class conflicts when loading different versions of the same library. It is enabled by default and is configurable through `plugins.isolation` settings .Additionally, each plugin can change its own isolation through the `isolation` property in `es-plugin.properties`- if not specified, the global setting in ES applies. Closes #5261
110 lines
3.4 KiB
Java
110 lines
3.4 KiB
Java
/*
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* Licensed to Elasticsearch under one or more contributor
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* license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright
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* ownership. Elasticsearch licenses this file to you under
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* the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package org.elasticsearch.plugins;
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import com.google.common.collect.Lists;
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import java.io.IOException;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.util.*;
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public class PluginClassLoader extends URLClassLoader {
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private final ClassLoader system;
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private final URL url;
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PluginClassLoader(URL[] urls, ClassLoader parent) throws IOException {
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super(urls, parent);
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url = (urls != null && urls.length > 0 ? urls[0] : null);
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ClassLoader sys = getSystemClassLoader();
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while (sys.getParent() != null) {
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sys = sys.getParent();
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}
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system = sys;
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}
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// load first from system class loader then fall back to this one
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@Override
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protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
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Class<?> c = findLoadedClass(name);
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if (c == null) {
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// check system class loader (jvm & bootclasspath)
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if (system != null) {
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try {
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c = system.loadClass(name);
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} catch (ClassNotFoundException ignored) {
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}
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}
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if (c == null) {
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try {
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// check plugin classloader
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c = findClass(name);
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} catch (ClassNotFoundException e) {
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// fall back to parent
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c = super.loadClass(name, resolve);
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}
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}
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}
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if (resolve) {
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resolveClass(c);
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}
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return c;
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}
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@Override
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public URL getResource(String name) {
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// apply same rules frmo loadClass
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URL url = null;
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if (system != null) {
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url = system.getResource(name);
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}
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if (url == null) {
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url = findResource(name);
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if (url == null) {
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url = super.getResource(name);
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}
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}
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return url;
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}
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@Override
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public Enumeration<URL> getResources(String name) throws IOException {
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List<URL> urls = Lists.newArrayList();
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if (system != null) {
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urls.addAll(Collections.list(system.getResources(name)));
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}
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urls.addAll(Collections.list(findResources(name)));
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ClassLoader parent = getParent();
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if (parent != null) {
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urls.addAll(Collections.list(parent.getResources(name)));
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}
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return Collections.enumeration(urls);
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}
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@Override
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public String toString() {
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return String.format(Locale.US, "PluginClassLoader for url [%s], classpath [%s], systemCL [%s]", url, Arrays.toString(getURLs()), system);
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}
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} |