org.camunda.bpm.engine.impl.context.ProcessApplicationClassloaderInterceptor Maven / Gradle / Ivy
/*
* Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
* under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. Camunda licenses this file to you under the Apache License,
* Version 2.0; 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.camunda.bpm.engine.impl.context;
import java.util.concurrent.Callable;
import org.camunda.bpm.engine.impl.util.ClassLoaderUtil;
/**
* Wrapps the user-provided {@link Callable} and records the
* Thread Context Classloader after the context switch has been performed.
* This allows detecting if the Thread Context has been manipulated by the container after that
* (Usually due to cross application EJB invocations).
*
* @author Daniel Meyer
*
*/
public class ProcessApplicationClassloaderInterceptor implements Callable {
private static ThreadLocal PA_CLASSLOADER = new ThreadLocal();
protected Callable delegate;
public ProcessApplicationClassloaderInterceptor(Callable delegate) {
this.delegate = delegate;
}
public T call() throws Exception {
try {
// record thread context right after context switch
PA_CLASSLOADER.set(ClassLoaderUtil.getContextClassloader());
// proceed with delegate callable invocation
return delegate.call();
}
finally {
PA_CLASSLOADER.remove();
}
}
public static ClassLoader getProcessApplicationClassLoader() {
return PA_CLASSLOADER.get();
}
}