org.jboss.marshalling.ModularClassResolver Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 org.jboss.marshalling;
import static java.lang.System.getSecurityManager;
import static java.security.AccessController.doPrivileged;
import java.io.IOException;
import java.io.InvalidClassException;
import java.lang.reflect.Proxy;
import java.security.PrivilegedAction;
import org.jboss.modules.Module;
import org.jboss.modules.ModuleIdentifier;
import org.jboss.modules.ModuleLoadException;
import org.jboss.modules.ModuleLoader;
/**
* A class table which implements an alternate class resolution strategy based on JBoss Modules.
* Each class name is stored along with its corresponding module identifier, which allows the object graph
* to be exactly reconstituted on the remote side. This class should be used when the marshalling and
* unmarshalling side may have differing class files.
*
* @author David M. Lloyd
*/
public final class ModularClassResolver implements ClassResolver {
private final ModuleLoader moduleLoader;
private static final ClassLoader MODULE_CLASS_LOADER;
static {
if (getSecurityManager() == null) {
MODULE_CLASS_LOADER = Module.class.getClassLoader();
} else {
MODULE_CLASS_LOADER = doPrivileged(new PrivilegedAction() {
@Override
public ClassLoader run() {
return Module.class.getClassLoader();
}
});
}
}
private ModularClassResolver(final ModuleLoader moduleLoader) {
this.moduleLoader = moduleLoader;
}
/**
* Construct a new instance using the given module loader.
*
* @param moduleLoader the module loader
* @return the new instance
*/
public static ModularClassResolver getInstance(final ModuleLoader moduleLoader) {
return new ModularClassResolver(moduleLoader);
}
/** {@inheritDoc} */
public void annotateClass(final Marshaller marshaller, final Class clazz) throws IOException {
final Module module = Module.forClass(clazz);
if (module == null) {
marshaller.writeObject(null);
} else {
final ModuleIdentifier identifier = module.getIdentifier();
marshaller.writeObject(identifier.getName());
marshaller.writeObject(identifier.getSlot());
}
}
/** {@inheritDoc} */
public void annotateProxyClass(final Marshaller marshaller, final Class proxyClass) throws IOException {
final Module module = Module.forClass(proxyClass);
if (module == null) {
marshaller.writeObject(null);
} else {
final ModuleIdentifier identifier = module.getIdentifier();
marshaller.writeObject(identifier.getName());
marshaller.writeObject(identifier.getSlot());
}
}
/** {@inheritDoc} */
public String getClassName(final Class clazz) throws IOException {
return clazz.getName();
}
/** {@inheritDoc} */
public String[] getProxyInterfaces(final Class proxyClass) throws IOException {
final Class[] interfaces = proxyClass.getInterfaces();
final String[] names = new String[interfaces.length];
for (int i = 0; i < interfaces.length; i++) {
names[i] = getClassName(interfaces[i]);
}
return names;
}
/** {@inheritDoc} */
public Class resolveClass(final Unmarshaller unmarshaller, final String className, final long serialVersionUID) throws IOException, ClassNotFoundException {
final String name = (String) unmarshaller.readObject();
if (name == null) {
return Class.forName(className, false, MODULE_CLASS_LOADER);
}
final String slot = (String) unmarshaller.readObject();
final ModuleIdentifier identifier = ModuleIdentifier.create(name, slot);
try {
final ClassLoader classLoader;
final Module module = moduleLoader.loadModule(identifier);
if (getSecurityManager() == null) {
classLoader = module.getClassLoader();
} else {
classLoader = doPrivileged(new PrivilegedAction() {
@Override
public ClassLoader run() {
return module.getClassLoader();
}
});
}
return Class.forName(className, false, classLoader);
} catch (ModuleLoadException e) {
final InvalidClassException ce = new InvalidClassException(className, "Module load failed");
ce.initCause(e);
throw ce;
}
}
/** {@inheritDoc} */
public Class resolveProxyClass(final Unmarshaller unmarshaller, final String[] names) throws IOException, ClassNotFoundException {
final String name = (String) unmarshaller.readObject();
final ClassLoader classLoader;
if (name == null) {
classLoader = MODULE_CLASS_LOADER;
} else {
final String slot = (String) unmarshaller.readObject();
final ModuleIdentifier identifier = ModuleIdentifier.create(name, slot);
final Module module;
try {
module = moduleLoader.loadModule(identifier);
} catch (ModuleLoadException e) {
final InvalidClassException ce = new InvalidClassException("Module load failed");
ce.initCause(e);
throw ce;
}
classLoader = module.getClassLoader();
}
final int len = names.length;
final Class[] interfaces = new Class[len];
for (int i = 0; i < len; i ++) {
interfaces[i] = Class.forName(names[i], false, classLoader);
}
return Proxy.getProxyClass(classLoader, interfaces);
}
}