/**
* 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: CMTRequiredTransactionInterceptor.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.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 REQUIRED attribute.
* @author Florent Benoit
*/
public class CMTRequiredTransactionInterceptor extends AbsTransactionInterceptor {
/**
* Logger.
*/
private Log logger = LogFactory.getLog(CMTRequiredTransactionInterceptor.class);
/**
* Constructor.<br>
* Acquire the transaction manager.
*/
public CMTRequiredTransactionInterceptor() {
super();
}
/**
* Execute transaction as specified with the REQUIRED 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 ?12.6.2.2</a>
*/
@Override
public Object intercept(final EasyBeansInvocationContext invocationContext) throws Exception {
logger.debug("Calling Required 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 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.
*/
boolean startedTransaction = false;
if (transaction == null) {
try {
getTransactionManager().begin();
startedTransaction = true;
} 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);
}
}
// else
/*
* If a client invokes the enterprise bean's method while the client is
* associated with a transaction context, the container invokes the
* enterprise bean's method in the client's transaction context.
*/
boolean gotBusinessException = false;
try {
return invocationContext.proceed();
} catch (Exception e) {
gotBusinessException = true;
// Chapter 14.3.1
// Runs in the context of the client
if (!startedTransaction) {
handleContextClientTransaction(invocationContext, e);
} else {
// Container's transaction
handleContextContainerTransaction(invocationContext, e);
}
// Shouldn't come here
return null;
} finally {
if (!gotBusinessException) {
// only do some operations if transaction has been started
// before
// invoking the method.
if (startedTransaction) {
// 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 RuntimeException("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);
}
}
}
}
}
}