/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.invocation;
import java.security.AccessController;
import java.security.PrivilegedAction;
import org.jboss.marshalling.cloner.ClassLoaderClassCloner;
import org.jboss.marshalling.cloner.ClonerConfiguration;
import org.jboss.marshalling.cloner.ObjectCloner;
import org.jboss.marshalling.cloner.ObjectClonerFactory;
import org.jboss.marshalling.cloner.ObjectCloners;
/**
* An invocation processor which passes the invocation (possibly by value) to a target class loader. Invocations will be
* cloned to the target class loader; replies will be cloned to the caller's thread context class loader. The target
* interceptor is responsible for security concerns such as authorization as well as setting up environmental context
* such as transaction propagation, naming context, context class loader, etc.
*
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
public final class InVMRemoteInterceptor implements Interceptor {
private static final PrivilegedAction<ClassLoader> GET_CLASS_LOADER_ACTION = new PrivilegedAction<ClassLoader>() {
public ClassLoader run() {
return Thread.currentThread().getContextClassLoader();
}
};
private final ClonerConfiguration configuration;
/**
* Construct a new instance.
*
* @param targetClassLoader the target class loader
*
*/
public InVMRemoteInterceptor(final ClassLoader targetClassLoader) {
configuration = new ClonerConfiguration();
configuration.setClassCloner(new ClassLoaderClassCloner(targetClassLoader));
}
/** {@inheritDoc} */
public Object processInvocation(final InterceptorContext context) throws Exception {
final Object[] parameters = context.getParameters();
final ObjectClonerFactory clonerFactory = ObjectCloners.getSerializingObjectClonerFactory();
final ObjectCloner cloner = clonerFactory.createCloner(configuration);
final Object[] newParameters;
final int len = parameters.length;
newParameters = new Object[len];
for (int i = 0; i < len; i++) {
newParameters[i] = cloner.clone(parameters[i]);
}
context.setParameters(newParameters);
try {
final Object result = context.proceed();
if (result == null) {
return null;
}
final ClonerConfiguration copyBackConfiguration = new ClonerConfiguration();
copyBackConfiguration.setClassCloner(new ClassLoaderClassCloner(getContextClassLoader()));
return clonerFactory.createCloner(copyBackConfiguration).clone(result);
} finally {
context.setParameters(parameters);
}
}
private ClassLoader getContextClassLoader() {
final SecurityManager sm = System.getSecurityManager();
if (sm != null) {
return AccessController.doPrivileged(GET_CLASS_LOADER_ACTION);
} else {
return Thread.currentThread().getContextClassLoader();
}
}
}