/**
* EasyBeans
* Copyright (C) 2006 Bull S.A.S.
* Contact: easybeans@ow2.org
*
* This library 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 any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* --------------------------------------------------------------------------
* $Id: BMTTransactionInterceptor.java 5369 2010-02-24 14:58:19Z benoitf $
* --------------------------------------------------------------------------
*/
package org.ow2.easybeans.transaction.interceptors;
import javax.ejb.EJBException;
import javax.transaction.InvalidTransactionException;
import javax.transaction.SystemException;
import javax.transaction.Transaction;
import org.ow2.easybeans.api.EasyBeansInvocationContext;
import org.ow2.util.log.Log;
import org.ow2.util.log.LogFactory;
/**
* Defines an interceptor for method that are in Bean managed mode and then in Bean Managed Transaction.
* @author Florent Benoit
*/
public class BMTTransactionInterceptor extends AbsTransactionInterceptor {
/**
* Logger.
*/
private Log logger = LogFactory.getLog(BMTTransactionInterceptor.class);
/**
* Constructor.<br>
* Acquire the transaction manager.
*/
public BMTTransactionInterceptor() {
super();
}
/**
* Execute transaction as specified for BMT.
* @param invocationContext context with useful attributes on the current
* invocation
* @return result of the next invocation (to chain interceptors)
* @throws Exception if interceptor fails
* @see <a href="http://www.jcp.org/en/jsr/detail?id=220">EJB 3.0
* specification ?12.6.1</a>
*/
@Override
public Object intercept(final EasyBeansInvocationContext invocationContext) throws Exception {
logger.debug("Calling BMT TX interceptor");
// Get current transaction
Transaction transaction;
try {
transaction = getTransactionManager().getTransaction();
} catch (SystemException se) {
throw new EJBException("Cannot get the current transaction on transaction manager.", se);
}
logger.debug("Transaction found = {0}", transaction);
/*
* When a client invokes a business method via one of the enterprise
* bean?s client view interfaces, the container suspends any transaction
* that may be associated with the client request. If there is a
* transaction associated with the instance (this would happen if a
* stateful session bean instance started the transaction in some
* previous business method), the container associates the method
* execution with this transaction. If there are interceptor methods
* associated with the bean instances, these actions are taken before
* the interceptor methods are invoked.
*/
Transaction suspendedTransaction = null;
if (transaction != null) {
try {
logger.debug("Suspending transaction {0}", transaction);
suspendedTransaction = getTransactionManager().suspend();
} catch (SystemException se) {
throw new EJBException("Cannot call suspend() on the transaction manager.", se);
}
}
try {
return invocationContext.proceed();
} finally {
/*
* The container resumes the suspended association when the business
* method has completed.
*/
if (suspendedTransaction != null) {
logger.debug("Resuming transaction {0}", transaction);
try {
getTransactionManager().resume(suspendedTransaction);
} catch (InvalidTransactionException ite) {
throw new EJBException(
"Cannot call resume() on the given transaction. There is an invalid transaction", ite);
} catch (IllegalStateException ise) {
throw new EJBException(
"Cannot call resume() on the given transaction. There is another associated transaction",
ise);
} catch (SystemException se) {
throw new EJBException("Cannot call resume() on the given transaction. Unexpected error condition",
se);
}
}
}
}
}