/**
* 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: CMTRequiresNewTransactionInterceptor.java 5369 2010-02-24 14:58:19Z benoitf $
* --------------------------------------------------------------------------
*/
package org.ow2.easybeans.transaction.interceptors;
import static javax.transaction.Status.STATUS_ACTIVE;
import static javax.transaction.Status.STATUS_MARKED_ROLLBACK;
import javax.ejb.EJBException;
import javax.ejb.TransactionRolledbackLocalException;
import javax.transaction.InvalidTransactionException;
import javax.transaction.NotSupportedException;
import javax.transaction.RollbackException;
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 using the REQUIRES_NEW attribute.
* @author Florent Benoit
*/
public class CMTRequiresNewTransactionInterceptor extends AbsTransactionInterceptor {
/**
* Logger.
*/
private Log logger = LogFactory.getLog(CMTRequiresNewTransactionInterceptor.class);
/**
* Constructor.<br>
* Acquire the transaction manager.
*/
public CMTRequiresNewTransactionInterceptor() {
super();
}
/**
* Execute transaction as specified with the REQUIRES_NEW attribute.
* @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 12.6.2.4</a>
*/
@Override
public Object intercept(final EasyBeansInvocationContext invocationContext) throws Exception {
logger.debug("Calling RequiresNew 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);
/*
* If a client calls with a transaction context, the container
* suspends the association of the transaction context with the
* current thread before starting the new transaction and invoking
* the business method. The container resumes the suspended
* transaction association after the business method and the new
* transaction have been completed.
*/
// Existing transaction
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);
}
}
/*
* If the client invokes the enterprise bean's method while the client
* is not associated with a transaction context, the container
* automatically starts a new transaction before delegating a method
* call to the enterprise bean business method. The container
* automatically enlists all the resource managers accessed by the
* business method with the transaction. If the business method invokes
* other enterprise beans, the container passes the transaction context
* with the invocation. The container attempts to commit the transaction
* when the business method has completed. The container performs the
* commit protocol before the method result is sent to the client.
*/
try {
getTransactionManager().begin();
} catch (NotSupportedException nse) {
throw new EJBException("Transaction Manager implementation does not support nested transactions.", nse);
} catch (SystemException se) {
throw new EJBException("Cannot call begin() on the transaction manager.", se);
}
boolean gotBusinessException = false;
try {
return invocationContext.proceed();
} catch (Exception e) {
gotBusinessException = true;
handleContextContainerTransaction(invocationContext, e);
// Shouldn't come here
return null;
} finally {
// only do some operations if transaction has been started before
// invoking the method.
if (!gotBusinessException) {
// sanity check.
Transaction transactionAfter = null;
try {
transactionAfter = getTransactionManager().getTransaction();
} catch (SystemException se) {
throw new EJBException("Cannot get the current transaction on transaction manager.", se);
}
if (transactionAfter == null) {
throw new EJBException("Transaction disappeared.");
}
/*
* The container attempts to commit the transaction when the
* business method has completed. The container performs the
* commit protocol before the method result is sent to the
* client.
*/
try {
switch (getTransactionManager().getStatus()) {
case STATUS_ACTIVE:
getTransactionManager().commit();
break;
case STATUS_MARKED_ROLLBACK:
getTransactionManager().rollback();
break;
default:
throw new RuntimeException("Unexpected transaction status" + getTransactionManager().getStatus());
}
} catch (RollbackException e) {
throw new TransactionRolledbackLocalException("Could not commit transaction", e);
} catch (Exception e) {
throw new EJBException("Container exception", e);
}
}
// if it was suspended
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);
}
}
}
}
}