ActiveMQ example source code file (XaConnectionPool.java)

This example ActiveMQ source code file (XaConnectionPool.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - ActiveMQ tags/keywords

connectionpool, exception, jmsexception, jmsexception, objectpoolfactory, pooledsession, pooledsession, rollbackexception, synchronization, synchronization, system, transaction, transactionmanager, xaconnectionpool, xaconnectionpool

The ActiveMQ XaConnectionPool.java source code

/**
 * 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.pool;

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

import org.apache.activemq.ActiveMQConnection;
import org.apache.commons.pool.ObjectPoolFactory;

/**
 * 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.
 * 
 * @author gnodet
 */
public class XaConnectionPool extends ConnectionPool {

    private TransactionManager transactionManager;

    public XaConnectionPool(ActiveMQConnection connection, ObjectPoolFactory poolFactory, TransactionManager transactionManager) {
        super(connection, poolFactory);
        this.transactionManager = transactionManager;
    }

    public Session createSession(boolean transacted, int ackMode) throws JMSException {
        try {
            boolean isXa = (transactionManager != null && transactionManager.getStatus() != Status.STATUS_NO_TRANSACTION);
            if (isXa) {
                transacted = true;
                ackMode = Session.SESSION_TRANSACTED;
            }
            PooledSession session = (PooledSession) super.createSession(transacted, ackMode);
            if (isXa) {
                session.setIgnoreClose(true);
                transactionManager.getTransaction().registerSynchronization(new Synchronization(session));
                incrementReferenceCount();
                transactionManager.getTransaction().enlistResource(createXaResource(session));
            }
            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;
        }

        public void beforeCompletion() {
        }
        
        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);
            }
        }
    }
    
}