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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.plugins;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.lucene.codecs.Codec;
import org.apache.lucene.codecs.DocValuesFormat;
import org.apache.lucene.codecs.PostingsFormat;
import org.elasticsearch.Build;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.Version;
import org.elasticsearch.action.admin.cluster.node.info.PluginsAndModules;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.io.FileSystemUtils;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Setting.Property;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.core.Tuple;
import org.elasticsearch.index.IndexModule;
import org.elasticsearch.jdk.JarHell;
import org.elasticsearch.node.ReportingService;
import org.elasticsearch.plugins.spi.SPIClassIterator;
import org.elasticsearch.threadpool.ExecutorBuilder;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collectors;
import static org.elasticsearch.common.io.FileSystemUtils.isAccessibleDirectory;
public class PluginsService implements ReportingService {
private static final Logger logger = LogManager.getLogger(PluginsService.class);
private final Settings settings;
private final Path configPath;
/**
* We keep around a list of plugins and modules
*/
private final List> plugins;
private final PluginsAndModules info;
public static final Setting> MANDATORY_SETTING = Setting.listSetting(
"plugin.mandatory",
Collections.emptyList(),
Function.identity(),
Property.NodeScope
);
public List> getPluginSettings() {
return plugins.stream().flatMap(p -> p.v2().getSettings().stream()).collect(Collectors.toList());
}
public List getPluginSettingsFilter() {
return plugins.stream().flatMap(p -> p.v2().getSettingsFilter().stream()).collect(Collectors.toList());
}
/**
* Constructs a new PluginService
* @param settings The settings of the system
* @param modulesDirectory The directory modules exist in, or null if modules should not be loaded from the filesystem
* @param pluginsDirectory The directory plugins exist in, or null if plugins should not be loaded from the filesystem
* @param classpathPlugins Plugins that exist in the classpath which should be loaded
*/
public PluginsService(
Settings settings,
Path configPath,
Path modulesDirectory,
Path pluginsDirectory,
Collection> classpathPlugins
) {
this.settings = settings;
this.configPath = configPath;
List> pluginsLoaded = new ArrayList<>();
List pluginsList = new ArrayList<>();
// we need to build a List of plugins for checking mandatory plugins
final List pluginsNames = new ArrayList<>();
// first we load plugins that are on the classpath. this is for tests
for (Class pluginClass : classpathPlugins) {
Plugin plugin = loadPlugin(pluginClass, settings, configPath);
PluginInfo pluginInfo = new PluginInfo(
pluginClass.getName(),
"classpath plugin",
"NA",
Version.CURRENT,
"1.8",
pluginClass.getName(),
Collections.emptyList(),
false,
PluginType.ISOLATED,
"",
false
);
if (logger.isTraceEnabled()) {
logger.trace("plugin loaded from classpath [{}]", pluginInfo);
}
pluginsLoaded.add(new Tuple<>(pluginInfo, plugin));
pluginsList.add(pluginInfo);
pluginsNames.add(pluginInfo.getName());
}
Set seenBundles = new LinkedHashSet<>();
List modulesList = new ArrayList<>();
// load modules
if (modulesDirectory != null) {
try {
Set modules = getModuleBundles(modulesDirectory);
for (Bundle bundle : modules) {
modulesList.add(bundle.plugin);
}
seenBundles.addAll(modules);
} catch (IOException ex) {
throw new IllegalStateException("Unable to initialize modules", ex);
}
}
// now, find all the ones that are in plugins/
if (pluginsDirectory != null) {
try {
// TODO: remove this leniency, but tests bogusly rely on it
if (isAccessibleDirectory(pluginsDirectory, logger)) {
checkForFailedPluginRemovals(pluginsDirectory);
Set plugins = getPluginBundles(pluginsDirectory);
for (final Bundle bundle : plugins) {
pluginsList.add(bundle.plugin);
pluginsNames.add(bundle.plugin.getName());
}
seenBundles.addAll(plugins);
}
} catch (IOException ex) {
throw new IllegalStateException("Unable to initialize plugins", ex);
}
}
List> loaded = loadBundles(seenBundles);
pluginsLoaded.addAll(loaded);
this.info = new PluginsAndModules(pluginsList, modulesList);
this.plugins = Collections.unmodifiableList(pluginsLoaded);
// Checking expected plugins
List mandatoryPlugins = MANDATORY_SETTING.get(settings);
if (mandatoryPlugins.isEmpty() == false) {
Set missingPlugins = new HashSet<>();
for (String mandatoryPlugin : mandatoryPlugins) {
if (pluginsNames.contains(mandatoryPlugin) == false && missingPlugins.contains(mandatoryPlugin) == false) {
missingPlugins.add(mandatoryPlugin);
}
}
if (missingPlugins.isEmpty() == false) {
final String message = String.format(
Locale.ROOT,
"missing mandatory plugins [%s], found plugins [%s]",
Strings.collectionToDelimitedString(missingPlugins, ", "),
Strings.collectionToDelimitedString(pluginsNames, ", ")
);
throw new IllegalStateException(message);
}
}
// we don't log jars in lib/ we really shouldn't log modules,
// but for now: just be transparent so we can debug any potential issues
logPluginInfo(info.getModuleInfos(), "module", logger);
logPluginInfo(info.getPluginInfos(), "plugin", logger);
}
private static void logPluginInfo(final List pluginInfos, final String type, final Logger logger) {
assert pluginInfos != null;
if (pluginInfos.isEmpty()) {
logger.info("no " + type + "s loaded");
} else {
for (final String name : pluginInfos.stream().map(PluginInfo::getName).sorted().collect(Collectors.toList())) {
logger.info("loaded " + type + " [" + name + "]");
}
}
}
public Settings updatedSettings() {
Map foundSettings = new HashMap<>();
final Settings.Builder builder = Settings.builder();
for (Tuple plugin : plugins) {
Settings settings = plugin.v2().additionalSettings();
for (String setting : settings.keySet()) {
String oldPlugin = foundSettings.put(setting, plugin.v1().getName());
if (oldPlugin != null) {
throw new IllegalArgumentException(
"Cannot have additional setting ["
+ setting
+ "] "
+ "in plugin ["
+ plugin.v1().getName()
+ "], already added in plugin ["
+ oldPlugin
+ "]"
);
}
}
builder.put(settings);
}
return builder.put(this.settings).build();
}
public List> getExecutorBuilders(Settings settings) {
final ArrayList> builders = new ArrayList<>();
for (final Tuple plugin : plugins) {
builders.addAll(plugin.v2().getExecutorBuilders(settings));
}
return builders;
}
public void onIndexModule(IndexModule indexModule) {
for (Tuple plugin : plugins) {
plugin.v2().onIndexModule(indexModule);
}
}
/**
* Get information about plugins and modules
*/
@Override
public PluginsAndModules info() {
return info;
}
// a "bundle" is a group of jars in a single classloader
public static class Bundle {
public final PluginInfo plugin;
public final Set urls;
public final Set spiUrls;
public final Set allUrls;
public Bundle(PluginInfo plugin, Path dir) throws IOException {
this.plugin = Objects.requireNonNull(plugin);
Path spiDir = dir.resolve("spi");
// plugin has defined an explicit api for extension
this.spiUrls = Files.exists(spiDir) ? gatherUrls(spiDir) : null;
this.urls = gatherUrls(dir);
Set allUrls = new LinkedHashSet<>(urls);
if (spiUrls != null) {
allUrls.addAll(spiUrls);
}
this.allUrls = allUrls;
}
static Set gatherUrls(Path dir) throws IOException {
Set urls = new LinkedHashSet<>();
// gather urls for jar files
try (DirectoryStream jarStream = Files.newDirectoryStream(dir, "*.jar")) {
for (Path jar : jarStream) {
// normalize with toRealPath to get symlinks out of our hair
URL url = jar.toRealPath().toUri().toURL();
if (urls.add(url) == false) {
throw new IllegalStateException("duplicate codebase: " + url);
}
}
}
return urls;
}
Set getExtensionUrls() {
if (spiUrls != null) {
return spiUrls;
}
return urls;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Bundle bundle = (Bundle) o;
return Objects.equals(plugin, bundle.plugin);
}
@Override
public int hashCode() {
return Objects.hash(plugin);
}
}
/**
* Extracts all installed plugin directories from the provided {@code rootPath}.
*
* @param rootPath the path where the plugins are installed
* @return a list of all plugin paths installed in the {@code rootPath}
* @throws IOException if an I/O exception occurred reading the directories
*/
public static List findPluginDirs(final Path rootPath) throws IOException {
final List plugins = new ArrayList<>();
final Set seen = new HashSet<>();
if (Files.exists(rootPath)) {
try (DirectoryStream stream = Files.newDirectoryStream(rootPath)) {
for (Path plugin : stream) {
final String filename = plugin.getFileName().toString();
if (FileSystemUtils.isDesktopServicesStore(plugin)
|| filename.startsWith(".removing-")
|| filename.equals(".elasticsearch-plugins.yml.cache")) {
continue;
}
if (seen.add(filename) == false) {
throw new IllegalStateException("duplicate plugin: " + plugin);
}
plugins.add(plugin);
}
}
}
return plugins;
}
/**
* Verify the given plugin is compatible with the current Elasticsearch installation.
*/
public static void verifyCompatibility(PluginInfo info) {
if (info.getElasticsearchVersion().equals(Version.CURRENT) == false) {
throw new IllegalArgumentException(
"Plugin ["
+ info.getName()
+ "] was built for Elasticsearch version "
+ info.getElasticsearchVersion()
+ " but version "
+ Version.CURRENT
+ " is running"
);
}
JarHell.checkJavaVersion(info.getName(), info.getJavaVersion());
}
public static void checkForFailedPluginRemovals(final Path pluginsDirectory) throws IOException {
/*
* Check for the existence of a marker file that indicates any plugins are in a garbage state from a failed attempt to remove the
* plugin.
*/
try (DirectoryStream stream = Files.newDirectoryStream(pluginsDirectory, ".removing-*")) {
final Iterator iterator = stream.iterator();
if (iterator.hasNext()) {
final Path removing = iterator.next();
final String fileName = removing.getFileName().toString();
final String name = fileName.substring(1 + fileName.indexOf("-"));
final String message = String.format(
Locale.ROOT,
"found file [%s] from a failed attempt to remove the plugin [%s]; execute [elasticsearch-plugin remove %2$s]",
removing,
name
);
throw new IllegalStateException(message);
}
}
}
/** Get bundles for plugins installed in the given modules directory. */
public static Set getModuleBundles(Path modulesDirectory) throws IOException {
return findBundles(modulesDirectory, "module");
}
/** Get bundles for plugins installed in the given plugins directory. */
public static Set getPluginBundles(final Path pluginsDirectory) throws IOException {
return findBundles(pluginsDirectory, "plugin");
}
// searches subdirectories under the given directory for plugin directories
private static Set findBundles(final Path directory, String type) throws IOException {
final Set bundles = new HashSet<>();
for (final Path plugin : findPluginDirs(directory)) {
final Bundle bundle = readPluginBundle(plugin, type);
if (bundles.add(bundle) == false) {
throw new IllegalStateException("duplicate " + type + ": " + bundle.plugin);
}
if (type.equals("module") && bundle.plugin.getName().startsWith("test-") && Build.CURRENT.isSnapshot() == false) {
throw new IllegalStateException("external test module [" + plugin.getFileName() + "] found in non-snapshot build");
}
}
logger.trace(
() -> "findBundles("
+ type
+ ") returning: "
+ bundles.stream().map(b -> b.plugin.getName()).sorted().collect(Collectors.toList())
);
return bundles;
}
// get a bundle for a single plugin dir
private static Bundle readPluginBundle(final Path plugin, String type) throws IOException {
final PluginInfo info;
try {
info = PluginInfo.readFromProperties(plugin);
} catch (final IOException e) {
throw new IllegalStateException(
"Could not load plugin descriptor for " + type + " directory [" + plugin.getFileName() + "]",
e
);
}
return new Bundle(info, plugin);
}
/**
* Return the given bundles, sorted in dependency loading order.
*
* This sort is stable, so that if two plugins do not have any interdependency,
* their relative order from iteration of the provided set will not change.
*
* @throws IllegalStateException if a dependency cycle is found
*/
public static List sortBundles(Set bundles) {
Map namedBundles = bundles.stream().collect(Collectors.toMap(b -> b.plugin.getName(), Function.identity()));
LinkedHashSet sortedBundles = new LinkedHashSet<>();
LinkedHashSet dependencyStack = new LinkedHashSet<>();
for (Bundle bundle : bundles) {
addSortedBundle(bundle, namedBundles, sortedBundles, dependencyStack);
}
return new ArrayList<>(sortedBundles);
}
// add the given bundle to the sorted bundles, first adding dependencies
private static void addSortedBundle(
Bundle bundle,
Map bundles,
LinkedHashSet sortedBundles,
LinkedHashSet dependencyStack
) {
String name = bundle.plugin.getName();
if (dependencyStack.contains(name)) {
StringBuilder msg = new StringBuilder("Cycle found in plugin dependencies: ");
dependencyStack.forEach(s -> {
msg.append(s);
msg.append(" -> ");
});
msg.append(name);
throw new IllegalStateException(msg.toString());
}
if (sortedBundles.contains(bundle)) {
// already added this plugin, via a dependency
return;
}
dependencyStack.add(name);
for (String dependency : bundle.plugin.getExtendedPlugins()) {
Bundle depBundle = bundles.get(dependency);
if (depBundle == null) {
throw new IllegalArgumentException("Missing plugin [" + dependency + "], dependency of [" + name + "]");
}
addSortedBundle(depBundle, bundles, sortedBundles, dependencyStack);
assert sortedBundles.contains(depBundle);
}
dependencyStack.remove(name);
sortedBundles.add(bundle);
}
private List> loadBundles(Set bundles) {
List> plugins = new ArrayList<>();
Map> loaded = new HashMap<>();
Map> transitiveUrls = new HashMap<>();
List sortedBundles = sortBundles(bundles);
for (Bundle bundle : sortedBundles) {
if (bundle.plugin.getType() != PluginType.BOOTSTRAP) {
checkBundleJarHell(JarHell.parseClassPath(), bundle, transitiveUrls);
final Plugin plugin = loadBundle(bundle, loaded);
plugins.add(new Tuple<>(bundle.plugin, plugin));
}
}
loadExtensions(plugins);
return Collections.unmodifiableList(plugins);
}
// package-private for test visibility
static void loadExtensions(List> plugins) {
Map> extendingPluginsByName = plugins.stream()
.flatMap(t -> t.v1().getExtendedPlugins().stream().map(extendedPlugin -> Tuple.tuple(extendedPlugin, t.v2())))
.collect(Collectors.groupingBy(Tuple::v1, Collectors.mapping(Tuple::v2, Collectors.toList())));
for (Tuple pluginTuple : plugins) {
if (pluginTuple.v2() instanceof ExtensiblePlugin) {
loadExtensionsForPlugin(
(ExtensiblePlugin) pluginTuple.v2(),
extendingPluginsByName.getOrDefault(pluginTuple.v1().getName(), List.of())
);
}
}
}
private static void loadExtensionsForPlugin(ExtensiblePlugin extensiblePlugin, List extendingPlugins) {
ExtensiblePlugin.ExtensionLoader extensionLoader = new ExtensiblePlugin.ExtensionLoader() {
@Override
public List loadExtensions(Class extensionPointType) {
List result = new ArrayList<>();
for (Plugin extendingPlugin : extendingPlugins) {
result.addAll(createExtensions(extensionPointType, extendingPlugin));
}
return Collections.unmodifiableList(result);
}
};
extensiblePlugin.loadExtensions(extensionLoader);
}
private static List createExtensions(Class extensionPointType, Plugin plugin) {
SPIClassIterator classIterator = SPIClassIterator.get(extensionPointType, plugin.getClass().getClassLoader());
List extensions = new ArrayList<>();
while (classIterator.hasNext()) {
Class extensionClass = classIterator.next();
extensions.add(createExtension(extensionClass, extensionPointType, plugin));
}
return extensions;
}
// package-private for test visibility
static T createExtension(Class extensionClass, Class extensionPointType, Plugin plugin) {
@SuppressWarnings("unchecked")
Constructor[] constructors = (Constructor[]) extensionClass.getConstructors();
if (constructors.length == 0) {
throw new IllegalStateException("no public " + extensionConstructorMessage(extensionClass, extensionPointType));
}
if (constructors.length > 1) {
throw new IllegalStateException("no unique public " + extensionConstructorMessage(extensionClass, extensionPointType));
}
final Constructor constructor = constructors[0];
if (constructor.getParameterCount() > 1) {
throw new IllegalStateException(extensionSignatureMessage(extensionClass, extensionPointType, plugin));
}
if (constructor.getParameterCount() == 1 && constructor.getParameterTypes()[0] != plugin.getClass()) {
throw new IllegalStateException(
extensionSignatureMessage(extensionClass, extensionPointType, plugin)
+ ", not ("
+ constructor.getParameterTypes()[0].getName()
+ ")"
);
}
try {
if (constructor.getParameterCount() == 0) {
return constructor.newInstance();
} else {
return constructor.newInstance(plugin);
}
} catch (ReflectiveOperationException e) {
throw new IllegalStateException(
"failed to create extension [" + extensionClass.getName() + "] of type [" + extensionPointType.getName() + "]",
e
);
}
}
private static String extensionSignatureMessage(Class extensionClass, Class extensionPointType, Plugin plugin) {
return "signature of "
+ extensionConstructorMessage(extensionClass, extensionPointType)
+ " must be either () or ("
+ plugin.getClass().getName()
+ ")";
}
private static String extensionConstructorMessage(Class extensionClass, Class extensionPointType) {
return "constructor for extension [" + extensionClass.getName() + "] of type [" + extensionPointType.getName() + "]";
}
// jar-hell check the bundle against the parent classloader and extended plugins
// the plugin cli does it, but we do it again, in case users mess with jar files manually
public static void checkBundleJarHell(Set classpath, Bundle bundle, Map> transitiveUrls) {
// invariant: any plugins this plugin bundle extends have already been added to transitiveUrls
List exts = bundle.plugin.getExtendedPlugins();
try {
final Logger logger = LogManager.getLogger(JarHell.class);
Set extendedPluginUrls = new HashSet<>();
for (String extendedPlugin : exts) {
Set pluginUrls = transitiveUrls.get(extendedPlugin);
assert pluginUrls != null : "transitive urls should have already been set for " + extendedPlugin;
// consistency check: extended plugins should not have duplicate codebases with each other
Set intersection = new HashSet<>(extendedPluginUrls);
intersection.retainAll(pluginUrls);
if (intersection.isEmpty() == false) {
throw new IllegalStateException(
"jar hell! extended plugins " + exts + " have duplicate codebases with each other: " + intersection
);
}
// jar hell check: extended plugins (so far) do not have jar hell with each other
extendedPluginUrls.addAll(pluginUrls);
JarHell.checkJarHell(extendedPluginUrls, logger::debug);
// consistency check: each extended plugin should not have duplicate codebases with implementation+spi of this plugin
intersection = new HashSet<>(bundle.allUrls);
intersection.retainAll(pluginUrls);
if (intersection.isEmpty() == false) {
throw new IllegalStateException(
"jar hell! duplicate codebases with extended plugin [" + extendedPlugin + "]: " + intersection
);
}
// jar hell check: extended plugins (so far) do not have jar hell with implementation+spi of this plugin
Set implementation = new HashSet<>(bundle.allUrls);
implementation.addAll(extendedPluginUrls);
JarHell.checkJarHell(implementation, logger::debug);
}
// Set transitive urls for other plugins to extend this plugin. Note that jarhell has already been checked above.
// This uses the extension urls (spi if set) since the implementation will not be in the transitive classpath at runtime.
extendedPluginUrls.addAll(bundle.getExtensionUrls());
transitiveUrls.put(bundle.plugin.getName(), extendedPluginUrls);
// check we don't have conflicting codebases with core
Set intersection = new HashSet<>(classpath);
intersection.retainAll(bundle.allUrls);
if (intersection.isEmpty() == false) {
throw new IllegalStateException("jar hell! duplicate codebases between plugin and core: " + intersection);
}
// check we don't have conflicting classes
Set union = new HashSet<>(classpath);
union.addAll(bundle.allUrls);
JarHell.checkJarHell(union, logger::debug);
} catch (final IllegalStateException ise) {
throw new IllegalStateException("failed to load plugin " + bundle.plugin.getName() + " due to jar hell", ise);
} catch (final Exception e) {
throw new IllegalStateException("failed to load plugin " + bundle.plugin.getName() + " while checking for jar hell", e);
}
}
private Plugin loadBundle(Bundle bundle, Map> loaded) {
String name = bundle.plugin.getName();
verifyCompatibility(bundle.plugin);
// collect loaders of extended plugins
List extendedLoaders = new ArrayList<>();
for (String extendedPluginName : bundle.plugin.getExtendedPlugins()) {
Tuple extendedPlugin = loaded.get(extendedPluginName);
assert extendedPlugin != null;
if (ExtensiblePlugin.class.isInstance(extendedPlugin.v1()) == false) {
throw new IllegalStateException("Plugin [" + name + "] cannot extend non-extensible plugin [" + extendedPluginName + "]");
}
extendedLoaders.add(extendedPlugin.v2());
}
ClassLoader parentLoader = PluginLoaderIndirection.createLoader(getClass().getClassLoader(), extendedLoaders);
ClassLoader spiLoader = null;
if (bundle.spiUrls != null) {
spiLoader = URLClassLoader.newInstance(bundle.spiUrls.toArray(new URL[0]), parentLoader);
}
ClassLoader loader = URLClassLoader.newInstance(bundle.urls.toArray(new URL[0]), spiLoader == null ? parentLoader : spiLoader);
if (spiLoader == null) {
// use full implementation for plugins extending this one
spiLoader = loader;
}
// reload SPI with any new services from the plugin
reloadLuceneSPI(loader);
ClassLoader cl = Thread.currentThread().getContextClassLoader();
try {
// Set context class loader to plugin's class loader so that plugins
// that have dependencies with their own SPI endpoints have a chance to load
// and initialize them appropriately.
AccessController.doPrivileged((PrivilegedAction) () -> {
Thread.currentThread().setContextClassLoader(loader);
return null;
});
Class pluginClass = loadPluginClass(bundle.plugin.getClassname(), loader);
if (loader != pluginClass.getClassLoader()) {
throw new IllegalStateException(
"Plugin ["
+ name
+ "] must reference a class loader local Plugin class ["
+ bundle.plugin.getClassname()
+ "] (class loader ["
+ pluginClass.getClassLoader()
+ "])"
);
}
Plugin plugin = loadPlugin(pluginClass, settings, configPath);
loaded.put(name, Tuple.tuple(plugin, spiLoader));
return plugin;
} finally {
AccessController.doPrivileged((PrivilegedAction) () -> {
Thread.currentThread().setContextClassLoader(cl);
return null;
});
}
}
/**
* Reloads all Lucene SPI implementations using the new classloader.
* This method must be called after the new classloader has been created to
* register the services for use.
*/
static void reloadLuceneSPI(ClassLoader loader) {
// do NOT change the order of these method calls!
// Codecs:
PostingsFormat.reloadPostingsFormats(loader);
DocValuesFormat.reloadDocValuesFormats(loader);
Codec.reloadCodecs(loader);
}
private Class loadPluginClass(String className, ClassLoader loader) {
try {
return Class.forName(className, false, loader).asSubclass(Plugin.class);
} catch (ClassNotFoundException e) {
throw new ElasticsearchException("Could not find plugin class [" + className + "]", e);
}
}
private Plugin loadPlugin(Class pluginClass, Settings settings, Path configPath) {
final Constructor[] constructors = pluginClass.getConstructors();
if (constructors.length == 0) {
throw new IllegalStateException("no public constructor for [" + pluginClass.getName() + "]");
}
if (constructors.length > 1) {
throw new IllegalStateException("no unique public constructor for [" + pluginClass.getName() + "]");
}
final Constructor constructor = constructors[0];
if (constructor.getParameterCount() > 2) {
throw new IllegalStateException(signatureMessage(pluginClass));
}
final Class[] parameterTypes = constructor.getParameterTypes();
try {
if (constructor.getParameterCount() == 2 && parameterTypes[0] == Settings.class && parameterTypes[1] == Path.class) {
return (Plugin) constructor.newInstance(settings, configPath);
} else if (constructor.getParameterCount() == 1 && parameterTypes[0] == Settings.class) {
return (Plugin) constructor.newInstance(settings);
} else if (constructor.getParameterCount() == 0) {
return (Plugin) constructor.newInstance();
} else {
throw new IllegalStateException(signatureMessage(pluginClass));
}
} catch (final ReflectiveOperationException e) {
throw new IllegalStateException("failed to load plugin class [" + pluginClass.getName() + "]", e);
}
}
private String signatureMessage(final Class clazz) {
return String.format(
Locale.ROOT,
"no public constructor of correct signature for [%s]; must be [%s], [%s], or [%s]",
clazz.getName(),
"(org.elasticsearch.common.settings.Settings,java.nio.file.Path)",
"(org.elasticsearch.common.settings.Settings)",
"()"
);
}
@SuppressWarnings("unchecked")
public List filterPlugins(Class type) {
return plugins.stream().filter(x -> type.isAssignableFrom(x.v2().getClass())).map(p -> ((T) p.v2())).collect(Collectors.toList());
}
}
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