/**
* 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.
* <p/>
* 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.
* <p/>
* 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.
* <p/>
* 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.
* <p/>
* 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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