/*
* Copyright 2017 NAVER Corp.
*
* Licensed 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 com.navercorp.pinpoint.profiler.instrument.classloading;
import com.navercorp.pinpoint.exception.PinpointException;
import com.navercorp.pinpoint.profiler.plugin.PluginConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
/**
* @author Woonduk Kang(emeroad)
* @author jaehong.kim
*/
public class URLClassLoaderHandler implements ClassInjector {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
private final boolean isDebug = logger.isDebugEnabled();
private static final Method ADD_URL;
static {
try {
ADD_URL = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
ADD_URL.setAccessible(true);
} catch (Exception e) {
throw new PinpointException("Cannot access URLClassLoader.addURL(URL)", e);
}
}
private final URL pluginURL;
private final String pluginURLString;
public URLClassLoaderHandler(PluginConfig pluginConfig) {
if (pluginConfig == null) {
throw new NullPointerException("pluginConfig must not be null");
}
this.pluginURL = pluginConfig.getPluginJar();
this.pluginURLString = pluginURL.toExternalForm();
}
@Override
@SuppressWarnings("unchecked")
public <T> Class<? extends T> injectClass(ClassLoader classLoader, String className) {
try {
if (classLoader instanceof URLClassLoader) {
final URLClassLoader urlClassLoader = (URLClassLoader) classLoader;
addPluginURLIfAbsent(urlClassLoader);
return (Class<T>) urlClassLoader.loadClass(className);
}
} catch (Exception e) {
logger.warn("Failed to load plugin class {} with classLoader {}", className, classLoader, e);
throw new PinpointException("Failed to load plugin class " + className + " with classLoader " + classLoader, e);
}
throw new PinpointException("invalid ClassLoader");
}
@Override
public InputStream getResourceAsStream(ClassLoader targetClassLoader, String classPath) {
try {
if (targetClassLoader instanceof URLClassLoader) {
final URLClassLoader urlClassLoader = (URLClassLoader) targetClassLoader;
addPluginURLIfAbsent(urlClassLoader);
return targetClassLoader.getResourceAsStream(classPath);
}
} catch (Exception e) {
logger.warn("Failed to load plugin resource as stream {} with classLoader {}", classPath, targetClassLoader, e);
return null;
}
return null;
}
private void addPluginURLIfAbsent(URLClassLoader classLoader) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, ClassNotFoundException {
final URL[] urls = classLoader.getURLs();
if (urls != null) {
final boolean hasPluginJar = hasPluginJar(urls);
if (!hasPluginJar) {
if (isDebug) {
logger.debug("add Jar:{}", pluginURLString);
}
ADD_URL.invoke(classLoader, pluginURL);
}
}
}
private boolean hasPluginJar(URL[] urls) {
for (URL url : urls) {
// if (url.equals(pluginJarURL)) { fix very slow
// http://michaelscharf.blogspot.com/2006/11/javaneturlequals-and-hashcode-make.html
final String externalForm = url.toExternalForm();
if (pluginURLString.equals(externalForm)) {
return true;
}
}
return false;
}
}