activemq-jms-pool/src/main/java/org/apache/activemq/jms/pool/XaConnectionPool.java

/**
 * 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.jms.pool;

import javax.jms.Connection;
import javax.jms.JMSException;
import javax.jms.Session;
import javax.jms.XAConnection;
import javax.transaction.RollbackException;
import javax.transaction.Status;
import javax.transaction.SystemException;
import javax.transaction.TransactionManager;
import javax.transaction.xa.XAResource;

/**
 * An XA-aware connection pool. When a session is created and an xa transaction
 * is active, the session will automatically be enlisted in the current
 * transaction.
 */
public class XaConnectionPool extends ConnectionPool {

    private final TransactionManager transactionManager;

    public XaConnectionPool(Connection connection, TransactionManager transactionManager) {
        super(connection);
        this.transactionManager = transactionManager;
    }

    @Override
    protected Session makeSession(SessionKey key) throws JMSException {
        return ((XAConnection) connection).createXASession();
    }

    @Override
    public Session createSession(boolean transacted, int ackMode) throws JMSException {
        try {
            boolean isXa = (transactionManager != null && transactionManager.getStatus() != Status.STATUS_NO_TRANSACTION);
            if (isXa) {
                // if the xa tx aborts inflight we don't want to auto create a
                // local transaction or auto ack
                transacted = false;
                ackMode = Session.CLIENT_ACKNOWLEDGE;
            } else if (transactionManager != null) {
                // cmt or transactionManager managed
                transacted = false;
                if (ackMode == Session.SESSION_TRANSACTED) {
                    ackMode = Session.AUTO_ACKNOWLEDGE;
                }
            }
            PooledSession session = (PooledSession) super.createSession(transacted, ackMode);
            if (isXa) {
                session.setIgnoreClose(true);
                session.setIsXa(true);
                transactionManager.getTransaction().registerSynchronization(new Synchronization(session));
                incrementReferenceCount();
                transactionManager.getTransaction().enlistResource(createXaResource(session));
            } else {
                session.setIgnoreClose(false);
            }
            return session;
        } catch (RollbackException e) {
            final JMSException jmsException = new JMSException("Rollback Exception");
            jmsException.initCause(e);
            throw jmsException;
        } catch (SystemException e) {
            final JMSException jmsException = new JMSException("System Exception");
            jmsException.initCause(e);
            throw jmsException;
        }
    }

    protected XAResource createXaResource(PooledSession session) throws JMSException {
        return session.getXAResource();
    }

    protected class Synchronization implements javax.transaction.Synchronization {
        private final PooledSession session;

        private Synchronization(PooledSession session) {
            this.session = session;
        }

        @Override
        public void beforeCompletion() {
        }

        @Override
        public void afterCompletion(int status) {
            try {
                // This will return session to the pool.
                session.setIgnoreClose(false);
                session.close();
                decrementReferenceCount();
            } catch (JMSException e) {
                throw new RuntimeException(e);
            }
        }
    }
}