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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); 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.apache.activemq;

import javax.jms.JMSException;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TopicSession;
import javax.jms.TransactionInProgressException;
import javax.jms.XAQueueSession;
import javax.jms.XATopicSession;
import javax.transaction.xa.XAResource;

import org.apache.activemq.command.SessionId;

/**
 * The XASession interface extends the capability of Session by adding access
 * to a JMS provider's support for the  Java Transaction API (JTA) (optional).
 * This support takes the form of a javax.transaction.xa.XAResource object.
 * The functionality of this object closely resembles that defined by the
 * standard X/Open XA Resource interface.
 * 

* An application server controls the transactional assignment of an XASession * by obtaining its XAResource. It uses the XAResource to assign the session * to a transaction, prepare and commit work on the transaction, and so on. *

* An XAResource provides some fairly sophisticated facilities for * interleaving work on multiple transactions, recovering a list of * transactions in progress, and so on. A JTA aware JMS provider must fully * implement this functionality. This could be done by using the services of a * database that supports XA, or a JMS provider may choose to implement this * functionality from scratch. *

* A client of the application server is given what it thinks is a regular * JMS Session. Behind the scenes, the application server controls the * transaction management of the underlying XASession. *

* The XASession interface is optional. JMS providers are not required to * support this interface. This interface is for use by JMS providers to * support transactional environments. Client programs are strongly encouraged * to use the transactional support available in their environment, rather * than use these XA interfaces directly. * * @version $Revision: 1.5 $ * @see javax.jms.Session * @see javax.jms.QueueSession * @see javax.jms.TopicSession * @see javax.jms.XASession */ public class ActiveMQXASession extends ActiveMQSession implements QueueSession, TopicSession, XAQueueSession, XATopicSession { public ActiveMQXASession(ActiveMQXAConnection connection, SessionId sessionId, int theAcknowlegeMode, boolean dispatchAsync) throws JMSException { super(connection, sessionId, theAcknowlegeMode, dispatchAsync); } public boolean getTransacted() throws JMSException { return true; } public void rollback() throws JMSException { throw new TransactionInProgressException("Cannot rollback() inside an XASession"); } public void commit() throws JMSException { throw new TransactionInProgressException("Cannot commit() inside an XASession"); } public Session getSession() throws JMSException { return this; } public XAResource getXAResource() { return getTransactionContext(); } public QueueSession getQueueSession() throws JMSException { return new ActiveMQQueueSession(this); } public TopicSession getTopicSession() throws JMSException { return new ActiveMQTopicSession(this); } /** * This is called before transacted work is done by * the session. XA Work can only be done when this * XA resource is associated with an Xid. * * @throws JMSException not associated with an Xid */ protected void doStartTransaction() throws JMSException { if (!getTransactionContext().isInXATransaction()) { throw new JMSException("Session's XAResource has not been enlisted in a distributed transaction."); } } }





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