net.sf.ehcache.management.DevModeClassLoader Maven / Gradle / Ivy
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Ehcache is an open source, standards-based cache used to boost performance,
offload the database and simplify scalability. Ehcache is robust, proven and full-featured and
this has made it the most widely-used Java-based cache.
/**
* Copyright Terracotta, Inc.
*
* 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 net.sf.ehcache.management;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import net.sf.ehcache.util.MergedEnumeration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Classloader used for devmode to load management classes
* Substitutes for ResourceClassLoader
*
* @author hhuynh
*
*/
public class DevModeClassLoader extends ClassLoader {
/**
* devmode resource file containing Maven dependencies of rest agent jar
*/
private static final String DEVMODE_OS_DEPENDENCIES_RESOURCE = "/META-INF/devmode/net.sf.ehcache.internal/ehcache-rest-agent/dependencies.txt";
private static final String DEVMODE_EE_DEPENDENCIES_RESOURCE = "/META-INF/devmode/net.sf.ehcache.internal/ehcache-ee-rest-agent/dependencies.txt";
private static final Pattern ARTIFACT_PATTERN = Pattern.compile("^\\s*([^:]+):([^:]+):([^:]+):([^:]+):(.+)$");
private static final Logger LOG = LoggerFactory.getLogger(DevModeClassLoader.class);
private final URLClassLoader urlClassLoader;
/**
* constructor with a classloader parent
*
* @param parent
*/
public DevModeClassLoader(URL depsReource, ClassLoader parent) {
super(parent);
urlClassLoader = initUrlClassLoader(depsReource);
}
/**
* returns either EE or OS resource file that contains rest agent dependencies
* null if not found
*
* @return
*/
public static URL devModeResource() {
URL url = DevModeClassLoader.class.getResource(DEVMODE_EE_DEPENDENCIES_RESOURCE);
if (url != null) {
return url;
}
url = DevModeClassLoader.class.getResource(DEVMODE_OS_DEPENDENCIES_RESOURCE);
if (url != null) {
return url;
}
return null;
}
private URLClassLoader initUrlClassLoader(URL depsReource) {
List urlList = new ArrayList();
InputStream in = null;
try {
in = depsReource.openStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
String line = null;
while ((line = reader.readLine()) != null) {
Matcher m = ARTIFACT_PATTERN.matcher(line);
if (m.matches()) {
String scope = m.group(5);
if ("compile".equals(scope) || "runtime".equals(scope)) {
URL url = constructMavenLocalFile(m.group(1), m.group(2), m.group(3), m.group(4));
LOG.debug("devmode jar: " + url);
urlList.add(url);
}
}
}
return new URLClassLoader((URL[]) urlList.toArray(new URL[0]), getParent());
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
// ignored
}
}
}
}
private URL constructMavenLocalFile(String groupId, String artifactId, String type, String version) {
String base = System.getProperty("localMavenRepository");
if (base == null) {
base = System.getProperty("user.home") + "/.m2/repository";
}
File artifact = new File(base, groupId.replace('.', '/') + "/" + artifactId + "/" + version + "/" + artifactId + "-" + version
+ "." + type);
if (!artifact.exists()) {
throw new AssertionError("Can't find Maven artifact: " + groupId + ":" + artifactId + ":" + type + ":" + version);
}
try {
return artifact.toURI().toURL();
} catch (MalformedURLException e) {
throw new RuntimeException(e);
}
}
@Override
public synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
if (name.startsWith("java.")) {
return getParent().loadClass(name);
}
// changing the order of delegation to prefer the resourceClassLoader over its parents
Class c = findLoadedClass(name);
if (c == null) {
try {
c = findClass(name);
} catch (ClassNotFoundException e) {
c = getParent().loadClass(name);
}
}
if (resolve) {
resolveClass(c);
}
return c;
}
@Override
protected Class findClass(String name) throws ClassNotFoundException {
return urlClassLoader.loadClass(name);
}
@Override
public URL getResource(String name) {
URL url = findResource(name);
if (url == null) {
return super.getResource(name);
}
return url;
}
@Override
public Enumeration getResources(String name) throws IOException {
Enumeration[] tmp = new Enumeration[2];
tmp[0] = findResources(name);
tmp[1] = getParent().getResources(name);
return new MergedEnumeration(tmp[0], tmp[1]);
}
@Override
protected URL findResource(String name) {
return urlClassLoader.findResource(name);
}
@Override
protected Enumeration findResources(String name) throws IOException {
return urlClassLoader.findResources(name);
}
@Override
public InputStream getResourceAsStream(String name) {
URL resource = getResource(name);
if (resource != null) {
try {
return resource.openStream();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
return null;
}
}