home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Spring Framework example source code file (JmsTransactionManager.java)

This example Spring Framework source code file (JmsTransactionManager.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 - Spring Framework tags/keywords

connection, could, jms, jms, jmsexception, jmsresourceholder, jmsresourceholder, jmstransactionmanager, jmstransactionobject, jmstransactionobject, object, session, session, transactionsystemexception

The Spring Framework JmsTransactionManager.java source code

/*
 * Copyright 2002-2007 the original author or authors.
 *
 * Licensed 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.springframework.jms.connection;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.Session;
import javax.jms.TransactionRolledBackException;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.transaction.CannotCreateTransactionException;
import org.springframework.transaction.InvalidIsolationLevelException;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionSystemException;
import org.springframework.transaction.UnexpectedRollbackException;
import org.springframework.transaction.support.AbstractPlatformTransactionManager;
import org.springframework.transaction.support.DefaultTransactionStatus;
import org.springframework.transaction.support.ResourceTransactionManager;
import org.springframework.transaction.support.SmartTransactionObject;
import org.springframework.transaction.support.TransactionSynchronizationManager;

/**
 * {@link org.springframework.transaction.PlatformTransactionManager} implementation
 * for a single JMS {@link javax.jms.ConnectionFactory}. Binds a JMS
 * Connection/Session pair from the specified ConnectionFactory to the thread,
 * potentially allowing for one thread-bound Session per ConnectionFactory.
 *
 * <p>NOTE: This class requires a JMS 1.1+ provider because it builds on
 * the domain-independent API. <b>Use the {@link JmsTransactionManager102} subclass
 * for a JMS 1.0.2 provider, e.g. when running on a J2EE 1.3 server.</b>
 *
 * <p>This local strategy is an alternative to executing JMS operations within
 * JTA transactions. Its advantage is that it is able to work in any environment,
 * for example a standalone application or a test suite, with any message broker
 * as target. However, this strategy is <i>not able to provide XA transactions,
 * for example in order to share transactions between messaging and database access.
 * A full JTA/XA setup is required for XA transactions, typically using Spring's
 * {@link org.springframework.transaction.jta.JtaTransactionManager} as strategy.
 *
 * <p>Application code is required to retrieve the transactional JMS Session via
 * {@link ConnectionFactoryUtils#getTransactionalSession} instead of a standard
 * J2EE-style {@link ConnectionFactory#createConnection()} call with subsequent
 * Session creation. Spring's {@link org.springframework.jms.core.JmsTemplate}
 * will autodetect a thread-bound Session and automatically participate in it.
 *
 * <p>Alternatively, you can allow application code to work with the standard
 * J2EE-style lookup pattern on a ConnectionFactory, for example for legacy code
 * that is not aware of Spring at all. In that case, define a
 * {@link TransactionAwareConnectionFactoryProxy} for your target ConnectionFactory,
 * which will automatically participate in Spring-managed transactions.
 *
 * <p>This transaction strategy will typically be used in combination with
 * {@link SingleConnectionFactory}, which uses a single JMS Connection for all
 * JMS access in order to avoid the overhead of repeated Connection creation,
 * typically in a standalone application. Each transaction will then share the
 * same JMS Connection, while still using its own individual JMS Session.
 *
 * <p>Transaction synchronization is turned off by default, as this manager might
 * be used alongside a datastore-based Spring transaction manager such as the
 * JDBC {@link org.springframework.jdbc.datasource.DataSourceTransactionManager},
 * which has stronger needs for synchronization.
 *
 * @author Juergen Hoeller
 * @since 1.1
 * @see ConnectionFactoryUtils#getTransactionalSession
 * @see TransactionAwareConnectionFactoryProxy
 * @see org.springframework.jms.core.JmsTemplate
 */
public class JmsTransactionManager extends AbstractPlatformTransactionManager
		implements ResourceTransactionManager, InitializingBean {

	private ConnectionFactory connectionFactory;


	/**
	 * Create a new JmsTransactionManager for bean-style usage.
	 * <p>Note: The ConnectionFactory has to be set before using the instance.
	 * This constructor can be used to prepare a JmsTemplate via a BeanFactory,
	 * typically setting the ConnectionFactory via setConnectionFactory.
	 * <p>Turns off transaction synchronization by default, as this manager might
	 * be used alongside a datastore-based Spring transaction manager like
	 * DataSourceTransactionManager, which has stronger needs for synchronization.
	 * Only one manager is allowed to drive synchronization at any point of time.
	 * @see #setConnectionFactory
	 * @see #setTransactionSynchronization
	 */
	public JmsTransactionManager() {
		setTransactionSynchronization(SYNCHRONIZATION_NEVER);
	}

	/**
	 * Create a new JmsTransactionManager, given a ConnectionFactory.
	 * @param connectionFactory the ConnectionFactory to obtain connections from
	 */
	public JmsTransactionManager(ConnectionFactory connectionFactory) {
		this();
		setConnectionFactory(connectionFactory);
		afterPropertiesSet();
	}


	/**
	 * Set the JMS ConnectionFactory that this instance should manage transactions for.
	 */
	public void setConnectionFactory(ConnectionFactory cf) {
		if (cf instanceof TransactionAwareConnectionFactoryProxy) {
			// If we got a TransactionAwareConnectionFactoryProxy, we need to perform transactions
			// for its underlying target ConnectionFactory, else JMS access code won't see
			// properly exposed transactions (i.e. transactions for the target ConnectionFactory).
			this.connectionFactory = ((TransactionAwareConnectionFactoryProxy) cf).getTargetConnectionFactory();
		}
		else {
			this.connectionFactory = cf;
		}
	}

	/**
	 * Return the JMS ConnectionFactory that this instance should manage transactions for.
	 */
	public ConnectionFactory getConnectionFactory() {
		return this.connectionFactory;
	}

	/**
	 * Make sure the ConnectionFactory has been set.
	 */
	public void afterPropertiesSet() {
		if (getConnectionFactory() == null) {
			throw new IllegalArgumentException("Property 'connectionFactory' is required");
		}
	}


	public Object getResourceFactory() {
		return getConnectionFactory();
	}

	protected Object doGetTransaction() {
		JmsTransactionObject txObject = new JmsTransactionObject();
		txObject.setResourceHolder(
				(JmsResourceHolder) TransactionSynchronizationManager.getResource(getConnectionFactory()));
		return txObject;
	}

	protected boolean isExistingTransaction(Object transaction) {
		JmsTransactionObject txObject = (JmsTransactionObject) transaction;
		return (txObject.getResourceHolder() != null);
	}

	protected void doBegin(Object transaction, TransactionDefinition definition) {
		if (definition.getIsolationLevel() != TransactionDefinition.ISOLATION_DEFAULT) {
			throw new InvalidIsolationLevelException("JMS does not support an isolation level concept");
		}
		JmsTransactionObject txObject = (JmsTransactionObject) transaction;
		Connection con = null;
		Session session = null;
		try {
			con = createConnection();
			session = createSession(con);
			if (logger.isDebugEnabled()) {
				logger.debug("Created JMS transaction on Session [" + session + "] from Connection [" + con + "]");
			}
			txObject.setResourceHolder(new JmsResourceHolder(getConnectionFactory(), con, session));
			txObject.getResourceHolder().setSynchronizedWithTransaction(true);
			int timeout = determineTimeout(definition);
			if (timeout != TransactionDefinition.TIMEOUT_DEFAULT) {
				txObject.getResourceHolder().setTimeoutInSeconds(timeout);
			}
			TransactionSynchronizationManager.bindResource(
					getConnectionFactory(), txObject.getResourceHolder());
		}
		catch (JMSException ex) {
			if (session != null) {
				try {
					session.close();
				}
				catch (Throwable ex2) {
					// ignore
				}
			}
			if (con != null) {
				try {
					con.close();
				}
				catch (Throwable ex2) {
					// ignore
				}
			}
			throw new CannotCreateTransactionException("Could not create JMS transaction", ex);
		}
	}

	protected Object doSuspend(Object transaction) {
		JmsTransactionObject txObject = (JmsTransactionObject) transaction;
		txObject.setResourceHolder(null);
		return TransactionSynchronizationManager.unbindResource(getConnectionFactory());
	}

	protected void doResume(Object transaction, Object suspendedResources) {
		JmsResourceHolder conHolder = (JmsResourceHolder) suspendedResources;
		TransactionSynchronizationManager.bindResource(getConnectionFactory(), conHolder);
	}

	protected void doCommit(DefaultTransactionStatus status) {
		JmsTransactionObject txObject = (JmsTransactionObject) status.getTransaction();
		Session session = txObject.getResourceHolder().getSession();
		try {
			if (status.isDebug()) {
				logger.debug("Committing JMS transaction on Session [" + session + "]");
			}
			session.commit();
		}
		catch (TransactionRolledBackException ex) {
			throw new UnexpectedRollbackException("JMS transaction rolled back", ex);
		}
		catch (JMSException ex) {
			throw new TransactionSystemException("Could not commit JMS transaction", ex);
		}
	}

	protected void doRollback(DefaultTransactionStatus status) {
		JmsTransactionObject txObject = (JmsTransactionObject) status.getTransaction();
		Session session = txObject.getResourceHolder().getSession();
		try {
			if (status.isDebug()) {
				logger.debug("Rolling back JMS transaction on Session [" + session + "]");
			}
			session.rollback();
		}
		catch (JMSException ex) {
			throw new TransactionSystemException("Could not roll back JMS transaction", ex);
		}
	}

	protected void doSetRollbackOnly(DefaultTransactionStatus status) {
		JmsTransactionObject txObject = (JmsTransactionObject) status.getTransaction();
		txObject.getResourceHolder().setRollbackOnly();
	}

	protected void doCleanupAfterCompletion(Object transaction) {
		JmsTransactionObject txObject = (JmsTransactionObject) transaction;
		TransactionSynchronizationManager.unbindResource(getConnectionFactory());
		txObject.getResourceHolder().closeAll();
		txObject.getResourceHolder().clear();
	}


	//-------------------------------------------------------------------------
	// JMS 1.1 factory methods, potentially overridden for JMS 1.0.2
	//-------------------------------------------------------------------------

	/**
	 * Create a JMS Connection via this template's ConnectionFactory.
	 * <p>This implementation uses JMS 1.1 API.
	 * @return the new JMS Connection
	 * @throws javax.jms.JMSException if thrown by JMS API methods
	 */
	protected Connection createConnection() throws JMSException {
		return getConnectionFactory().createConnection();
	}

	/**
	 * Create a JMS Session for the given Connection.
	 * <p>This implementation uses JMS 1.1 API.
	 * @param con the JMS Connection to create a Session for
	 * @return the new JMS Session
	 * @throws javax.jms.JMSException if thrown by JMS API methods
	 */
	protected Session createSession(Connection con) throws JMSException {
		return con.createSession(true, Session.AUTO_ACKNOWLEDGE);
	}


	/**
	 * JMS transaction object, representing a JmsResourceHolder.
	 * Used as transaction object by JmsTransactionManager.
	 * @see JmsResourceHolder
	 */
	private static class JmsTransactionObject implements SmartTransactionObject {

		private JmsResourceHolder resourceHolder;

		public void setResourceHolder(JmsResourceHolder resourceHolder) {
			this.resourceHolder = resourceHolder;
		}

		public JmsResourceHolder getResourceHolder() {
			return this.resourceHolder;
		}

		public boolean isRollbackOnly() {
			return this.resourceHolder.isRollbackOnly();
		}
	}

}

Other Spring Framework examples (source code examples)

Here is a short list of links related to this Spring Framework JmsTransactionManager.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.