/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2017 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.platform.plugin.services.security.userrole;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
/**
* <p>This interceptor changes the thread context classloader to the class' current classloader.
*
* <p>We need this because of the
* {@link org.springframework.ldap.odm.typeconversion.impl.ConversionServiceConverterManager} which was introduced
* in spring-security-2.0.0.
*
* <p>This manager uses {@link org.springframework.util.ClassUtils#getDefaultClassLoader()} which creates
* new class instance using thread context classloader which differs from the current classloader of the caller class:
* <ul>
* <li> thread context classloader is the {@code org.apache.activemq.activemq-osgi}
* <li> current classloader is the spring's {@code WebappClassLoader}
* </ul>
*
* When {@code ConversionServiceConverterManager} tries to cast {@code clazz.newInstance()} to the
* {@code GenericConversionService} it throws {@code ClassCastException} if the context classloader hadn't changed.
*
* <p>That's why we need to proxy all classes which might use the {@code ConversionServiceConverterManager}.
*
* @author Andrei Abramov
*/
public class ClassloaderSwitcherInterceptor implements MethodInterceptor {
public Object invoke( MethodInvocation invocation ) throws Throwable {
Object ret;
ClassLoader currentThreadContextClassLoader = null;
boolean classLoaderWasSet = false;
try {
currentThreadContextClassLoader = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader( this.getClass().getClassLoader() );
classLoaderWasSet = true;
ret = invocation.proceed();
} finally {
if ( classLoaderWasSet ) {
Thread.currentThread().setContextClassLoader( currentThreadContextClassLoader );
}
}
return ret;
}
}