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Spring Framework example source code file (ConnectionFactoryUtils.java)

This example Spring Framework source code file (ConnectionFactoryUtils.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, connection, connectionfactory, jms, jmsexception, jmsexception, jmsresourceholder, jmsresourceholder, jmsresourcesynchronization, queuesession, resourcefactory, session, session, throwable

The Spring Framework ConnectionFactoryUtils.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.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TopicConnection;
import javax.jms.TopicConnectionFactory;
import javax.jms.TopicSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.transaction.support.TransactionSynchronizationAdapter;
import org.springframework.transaction.support.TransactionSynchronizationManager;
import org.springframework.util.Assert;

/**
 * Helper class for managing a JMS {@link javax.jms.ConnectionFactory}, in particular
 * for obtaining transactional JMS resources for a given ConnectionFactory.
 *
 * <p>Mainly for internal use within the framework. Used by
 * {@link org.springframework.jms.core.JmsTemplate} as well as
 * {@link org.springframework.jms.listener.DefaultMessageListenerContainer}.
 *
 * @author Juergen Hoeller
 * @since 2.0
 * @see SmartConnectionFactory
 */
public abstract class ConnectionFactoryUtils {

	private static final Log logger = LogFactory.getLog(ConnectionFactoryUtils.class);


	/**
	 * Release the given Connection, stopping it (if necessary) and eventually closing it.
	 * <p>Checks {@link SmartConnectionFactory#shouldStop}, if available.
	 * This is essentially a more sophisticated version of
	 * {@link org.springframework.jms.support.JmsUtils#closeConnection}.
	 * @param con the Connection to release
	 * (if this is <code>null, the call will be ignored)
	 * @param cf the ConnectionFactory that the Connection was obtained from
	 * (may be <code>null)
	 * @param started whether the Connection might have been started by the application
	 * @see SmartConnectionFactory#shouldStop
	 * @see org.springframework.jms.support.JmsUtils#closeConnection
	 */
	public static void releaseConnection(Connection con, ConnectionFactory cf, boolean started) {
		if (con == null) {
			return;
		}
		if (started && cf instanceof SmartConnectionFactory && ((SmartConnectionFactory) cf).shouldStop(con)) {
			try {
				con.stop();
			}
			catch (Throwable ex) {
				logger.debug("Could not stop JMS Connection before closing it", ex);
			}
		}
		try {
			con.close();
		}
		catch (Throwable ex) {
			logger.debug("Could not close JMS Connection", ex);
		}
	}

	/**
	 * Determine whether the given JMS Session is transactional, that is,
	 * bound to the current thread by Spring's transaction facilities.
	 * @param session the JMS Session to check
	 * @param cf the JMS ConnectionFactory that the Session originated from
	 * @return whether the Session is transactional
	 */
	public static boolean isSessionTransactional(Session session, ConnectionFactory cf) {
		if (session == null || cf == null) {
			return false;
		}
		JmsResourceHolder resourceHolder = (JmsResourceHolder) TransactionSynchronizationManager.getResource(cf);
		return (resourceHolder != null && resourceHolder.containsSession(session));
	}


	/**
	 * Obtain a JMS Session that is synchronized with the current transaction, if any.
	 * @param cf the ConnectionFactory to obtain a Session for
	 * @param existingCon the existing JMS Connection to obtain a Session for
	 * (may be <code>null)
	 * @param synchedLocalTransactionAllowed whether to allow for a local JMS transaction
	 * that is synchronized with a Spring-managed transaction (where the main transaction
	 * might be a JDBC-based one for a specific DataSource, for example), with the JMS
	 * transaction committing right after the main transaction. If not allowed, the given
	 * ConnectionFactory needs to handle transaction enlistment underneath the covers.
	 * @return the transactional Session, or <code>null if none found
	 * @throws JMSException in case of JMS failure
	 */
	public static Session getTransactionalSession(
			final ConnectionFactory cf, final Connection existingCon, final boolean synchedLocalTransactionAllowed)
			throws JMSException {

		return doGetTransactionalSession(cf, new ResourceFactory() {
			public Session getSession(JmsResourceHolder holder) {
				return holder.getSession(Session.class, existingCon);
			}
			public Connection getConnection(JmsResourceHolder holder) {
				return (existingCon != null ? existingCon : holder.getConnection());
			}
			public Connection createConnection() throws JMSException {
				return cf.createConnection();
			}
			public Session createSession(Connection con) throws JMSException {
				return con.createSession(synchedLocalTransactionAllowed, Session.AUTO_ACKNOWLEDGE);
			}
			public boolean isSynchedLocalTransactionAllowed() {
				return synchedLocalTransactionAllowed;
			}
		}, true);
	}

	/**
	 * Obtain a JMS QueueSession that is synchronized with the current transaction, if any.
	 * <p>Mainly intended for use with the JMS 1.0.2 API.
	 * @param cf the ConnectionFactory to obtain a Session for
	 * @param existingCon the existing JMS Connection to obtain a Session for
	 * (may be <code>null)
	 * @param synchedLocalTransactionAllowed whether to allow for a local JMS transaction
	 * that is synchronized with a Spring-managed transaction (where the main transaction
	 * might be a JDBC-based one for a specific DataSource, for example), with the JMS
	 * transaction committing right after the main transaction. If not allowed, the given
	 * ConnectionFactory needs to handle transaction enlistment underneath the covers.
	 * @return the transactional Session, or <code>null if none found
	 * @throws JMSException in case of JMS failure
	 */
	public static QueueSession getTransactionalQueueSession(
			final QueueConnectionFactory cf, final QueueConnection existingCon, final boolean synchedLocalTransactionAllowed)
			throws JMSException {

		return (QueueSession) doGetTransactionalSession(cf, new ResourceFactory() {
			public Session getSession(JmsResourceHolder holder) {
				return holder.getSession(QueueSession.class, existingCon);
			}
			public Connection getConnection(JmsResourceHolder holder) {
				return (existingCon != null ? existingCon : holder.getConnection(QueueConnection.class));
			}
			public Connection createConnection() throws JMSException {
				return cf.createQueueConnection();
			}
			public Session createSession(Connection con) throws JMSException {
				return ((QueueConnection) con).createQueueSession(synchedLocalTransactionAllowed, Session.AUTO_ACKNOWLEDGE);
			}
			public boolean isSynchedLocalTransactionAllowed() {
				return synchedLocalTransactionAllowed;
			}
		}, true);
	}

	/**
	 * Obtain a JMS TopicSession that is synchronized with the current transaction, if any.
	 * <p>Mainly intended for use with the JMS 1.0.2 API.
	 * @param cf the ConnectionFactory to obtain a Session for
	 * @param existingCon the existing JMS Connection to obtain a Session for
	 * (may be <code>null)
	 * @param synchedLocalTransactionAllowed whether to allow for a local JMS transaction
	 * that is synchronized with a Spring-managed transaction (where the main transaction
	 * might be a JDBC-based one for a specific DataSource, for example), with the JMS
	 * transaction committing right after the main transaction. If not allowed, the given
	 * ConnectionFactory needs to handle transaction enlistment underneath the covers.
	 * @return the transactional Session, or <code>null if none found
	 * @throws JMSException in case of JMS failure
	 */
	public static TopicSession getTransactionalTopicSession(
			final TopicConnectionFactory cf, final TopicConnection existingCon, final boolean synchedLocalTransactionAllowed)
			throws JMSException {

		return (TopicSession) doGetTransactionalSession(cf, new ResourceFactory() {
			public Session getSession(JmsResourceHolder holder) {
				return holder.getSession(TopicSession.class, existingCon);
			}
			public Connection getConnection(JmsResourceHolder holder) {
				return (existingCon != null ? existingCon : holder.getConnection(TopicConnection.class));
			}
			public Connection createConnection() throws JMSException {
				return cf.createTopicConnection();
			}
			public Session createSession(Connection con) throws JMSException {
				return ((TopicConnection) con).createTopicSession(synchedLocalTransactionAllowed, Session.AUTO_ACKNOWLEDGE);
			}
			public boolean isSynchedLocalTransactionAllowed() {
				return synchedLocalTransactionAllowed;
			}
		}, true);
	}

	/**
	 * Obtain a JMS Session that is synchronized with the current transaction, if any.
	 * <p>This doGetTransactionalSession variant always starts the underlying
	 * JMS Connection, assuming that the Session will be used for receiving messages.
	 * @param connectionFactory the JMS ConnectionFactory to bind for
	 * (used as TransactionSynchronizationManager key)
	 * @param resourceFactory the ResourceFactory to use for extracting or creating
	 * JMS resources
	 * @return the transactional Session, or <code>null if none found
	 * @throws JMSException in case of JMS failure
	 * @see #doGetTransactionalSession(javax.jms.ConnectionFactory, ResourceFactory, boolean)
	 */
	public static Session doGetTransactionalSession(
			ConnectionFactory connectionFactory, ResourceFactory resourceFactory) throws JMSException {

		return doGetTransactionalSession(connectionFactory, resourceFactory, true);
	}

	/**
	 * Obtain a JMS Session that is synchronized with the current transaction, if any.
	 * @param connectionFactory the JMS ConnectionFactory to bind for
	 * (used as TransactionSynchronizationManager key)
	 * @param resourceFactory the ResourceFactory to use for extracting or creating
	 * JMS resources
	 * @param startConnection whether the underlying JMS Connection approach should be
	 * started in order to allow for receiving messages. Note that a reused Connection
	 * may already have been started before, even if this flag is <code>false.
	 * @return the transactional Session, or <code>null if none found
	 * @throws JMSException in case of JMS failure
	 */
	public static Session doGetTransactionalSession(
			ConnectionFactory connectionFactory, ResourceFactory resourceFactory, boolean startConnection)
			throws JMSException {

		Assert.notNull(connectionFactory, "ConnectionFactory must not be null");
		Assert.notNull(resourceFactory, "ResourceFactory must not be null");

		JmsResourceHolder resourceHolder =
				(JmsResourceHolder) TransactionSynchronizationManager.getResource(connectionFactory);
		if (resourceHolder != null) {
			Session session = resourceFactory.getSession(resourceHolder);
			if (session != null) {
				if (startConnection) {
					Connection con = resourceFactory.getConnection(resourceHolder);
					if (con != null) {
						con.start();
					}
				}
				return session;
			}
			if (resourceHolder.isFrozen()) {
				return null;
			}
		}
		if (!TransactionSynchronizationManager.isSynchronizationActive()) {
			return null;
		}
		JmsResourceHolder resourceHolderToUse = resourceHolder;
		if (resourceHolderToUse == null) {
			resourceHolderToUse = new JmsResourceHolder(connectionFactory);
		}
		Connection con = resourceFactory.getConnection(resourceHolderToUse);
		Session session = null;
		try {
			boolean isExistingCon = (con != null);
			if (!isExistingCon) {
				con = resourceFactory.createConnection();
				resourceHolderToUse.addConnection(con);
			}
			session = resourceFactory.createSession(con);
			resourceHolderToUse.addSession(session, con);
			if (startConnection) {
				con.start();
			}
		}
		catch (JMSException ex) {
			if (session != null) {
				try {
					session.close();
				}
				catch (Throwable ex2) {
					// ignore
				}
			}
			if (con != null) {
				try {
					con.close();
				}
				catch (Throwable ex2) {
					// ignore
				}
			}
			throw ex;
		}
		if (resourceHolderToUse != resourceHolder) {
			TransactionSynchronizationManager.registerSynchronization(
					new JmsResourceSynchronization(
							connectionFactory, resourceHolderToUse, resourceFactory.isSynchedLocalTransactionAllowed()));
			resourceHolderToUse.setSynchronizedWithTransaction(true);
			TransactionSynchronizationManager.bindResource(connectionFactory, resourceHolderToUse);
		}
		return session;
	}


	/**
	 * Callback interface for resource creation.
	 * Serving as argument for the <code>doGetTransactionalSession method.
	 */
	public interface ResourceFactory {

		/**
		 * Fetch an appropriate Session from the given JmsResourceHolder.
		 * @param holder the JmsResourceHolder
		 * @return an appropriate Session fetched from the holder,
		 * or <code>null if none found
		 */
		Session getSession(JmsResourceHolder holder);

		/**
		 * Fetch an appropriate Connection from the given JmsResourceHolder.
		 * @param holder the JmsResourceHolder
		 * @return an appropriate Connection fetched from the holder,
		 * or <code>null if none found
		 */
		Connection getConnection(JmsResourceHolder holder);

		/**
		 * Create a new JMS Connection for registration with a JmsResourceHolder.
		 * @return the new JMS Connection
		 * @throws JMSException if thrown by JMS API methods
		 */
		Connection createConnection() throws JMSException;

		/**
		 * Create a new JMS Session for registration with a JmsResourceHolder.
		 * @param con the JMS Connection to create a Session for
		 * @return the new JMS Session
		 * @throws JMSException if thrown by JMS API methods
		 */
		Session createSession(Connection con) throws JMSException;

		/**
		 * Return whether to allow for a local JMS transaction that is synchronized with
		 * a Spring-managed transaction (where the main transaction might be a JDBC-based
		 * one for a specific DataSource, for example), with the JMS transaction
		 * committing right after the main transaction.
		 * @return whether to allow for synchronizing a local JMS transaction
		 */
		boolean isSynchedLocalTransactionAllowed();
	}


	/**
	 * Callback for resource cleanup at the end of a non-native JMS transaction
	 * (e.g. when participating in a JtaTransactionManager transaction).
	 * @see org.springframework.transaction.jta.JtaTransactionManager
	 */
	private static class JmsResourceSynchronization extends TransactionSynchronizationAdapter {

		private final Object resourceKey;

		private final JmsResourceHolder resourceHolder;

		private final boolean transacted;

		private boolean holderActive = true;

		public JmsResourceSynchronization(Object resourceKey, JmsResourceHolder resourceHolder, boolean transacted) {
			this.resourceKey = resourceKey;
			this.resourceHolder = resourceHolder;
			this.transacted = transacted;
		}

		public void suspend() {
			if (this.holderActive) {
				TransactionSynchronizationManager.unbindResource(this.resourceKey);
			}
		}

		public void resume() {
			if (this.holderActive) {
				TransactionSynchronizationManager.bindResource(this.resourceKey, this.resourceHolder);
			}
		}

		public void beforeCompletion() {
			TransactionSynchronizationManager.unbindResource(this.resourceKey);
			this.holderActive = false;
			if (!this.transacted) {
				this.resourceHolder.closeAll();
			}
		}

		public void afterCommit() {
			if (this.transacted) {
				try {
					this.resourceHolder.commitAll();
				}
				catch (JMSException ex) {
					throw new SynchedLocalTransactionFailedException("Local JMS transaction failed to commit", ex);
				}
			}
		}

		public void afterCompletion(int status) {
			if (this.transacted) {
				this.resourceHolder.closeAll();
			}
		}
	}

}

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