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Spring Framework example source code file (DelegatingConnectionFactory.java)

This example Spring Framework source code file (DelegatingConnectionFactory.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, initializingbean, jmsexception, queueconnection, queueconnection, queueconnectionfactory, queueconnectionfactory, smartconnectionfactory, string, topicconnection, topicconnectionfactory, topicconnectionfactory

The Spring Framework DelegatingConnectionFactory.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.TopicConnection;
import javax.jms.TopicConnectionFactory;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;

/**
 * {@link javax.jms.ConnectionFactory} implementation that delegates all calls
 * to a given target {@link javax.jms.ConnectionFactory}, adapting specific
 * <code>create(Queue/Topic)Connection calls to the target ConnectionFactory
 * if necessary (e.g. when running JMS 1.0.2 API based code against a generic
 * JMS 1.1 ConnectionFactory, such as ActiveMQ's PooledConnectionFactory).
 *
 * <p>This class allows for being subclassed, with subclasses overriding only
 * those methods (such as {@link #createConnection()}) that should not simply
 * delegate to the target ConnectionFactory.
 *
 * <p>Can also be defined as-is, wrapping a specific target ConnectionFactory,
 * using the "shouldStopConnections" flag to indicate whether Connections
 * obtained from the target factory are supposed to be stopped before closed.
 * The latter may be necessary for some connection pools that simply return
 * released connections to the pool, not stopping them while they sit in the pool.
 *
 * @author Juergen Hoeller
 * @since 2.0.2
 * @see #createConnection()
 * @see #setShouldStopConnections
 * @see ConnectionFactoryUtils#releaseConnection
 */
public class DelegatingConnectionFactory
		implements SmartConnectionFactory, QueueConnectionFactory, TopicConnectionFactory, InitializingBean {

	private ConnectionFactory targetConnectionFactory;

	private boolean shouldStopConnections = false;


	/**
	 * Set the target ConnectionFactory that this ConnectionFactory should delegate to.
	 */
	public void setTargetConnectionFactory(ConnectionFactory targetConnectionFactory) {
		Assert.notNull(targetConnectionFactory, "'targetConnectionFactory' must not be null");
		this.targetConnectionFactory = targetConnectionFactory;
	}

	/**
	 * Return the target ConnectionFactory that this ConnectionFactory delegates to.
	 */
	public ConnectionFactory getTargetConnectionFactory() {
		return this.targetConnectionFactory;
	}

	/**
	 * Indicate whether Connections obtained from the target factory are supposed
	 * to be stopped before closed ("true") or simply closed ("false").
	 * The latter may be necessary for some connection pools that simply return
	 * released connections to the pool, not stopping them while they sit in the pool.
	 * <p>Default is "false", simply closing Connections.
	 * @see ConnectionFactoryUtils#releaseConnection
	 */
	public void setShouldStopConnections(boolean shouldStopConnections) {
		this.shouldStopConnections = shouldStopConnections;
	}

	public void afterPropertiesSet() {
		if (getTargetConnectionFactory() == null) {
			throw new IllegalArgumentException("'targetConnectionFactory' is required");
		}
	}


	public Connection createConnection() throws JMSException {
		return getTargetConnectionFactory().createConnection();
	}

	public Connection createConnection(String username, String password) throws JMSException {
		return getTargetConnectionFactory().createConnection(username, password);
	}

	public QueueConnection createQueueConnection() throws JMSException {
		ConnectionFactory cf = getTargetConnectionFactory();
		if (cf instanceof QueueConnectionFactory) {
			return ((QueueConnectionFactory) cf).createQueueConnection();
		}
		else {
			Connection con = cf.createConnection();
			if (!(con instanceof QueueConnection)) {
				throw new javax.jms.IllegalStateException("'targetConnectionFactory' is not a QueueConnectionFactory");
			}
			return (QueueConnection) con;
		}
	}

	public QueueConnection createQueueConnection(String username, String password) throws JMSException {
		ConnectionFactory cf = getTargetConnectionFactory();
		if (cf instanceof QueueConnectionFactory) {
			return ((QueueConnectionFactory) cf).createQueueConnection(username, password);
		}
		else {
			Connection con = cf.createConnection(username, password);
			if (!(con instanceof QueueConnection)) {
				throw new javax.jms.IllegalStateException("'targetConnectionFactory' is not a QueueConnectionFactory");
			}
			return (QueueConnection) con;
		}
	}

	public TopicConnection createTopicConnection() throws JMSException {
		ConnectionFactory cf = getTargetConnectionFactory();
		if (cf instanceof TopicConnectionFactory) {
			return ((TopicConnectionFactory) cf).createTopicConnection();
		}
		else {
			Connection con = cf.createConnection();
			if (!(con instanceof TopicConnection)) {
				throw new javax.jms.IllegalStateException("'targetConnectionFactory' is not a TopicConnectionFactory");
			}
			return (TopicConnection) con;
		}
	}

	public TopicConnection createTopicConnection(String username, String password) throws JMSException {
		ConnectionFactory cf = getTargetConnectionFactory();
		if (cf instanceof TopicConnectionFactory) {
			return ((TopicConnectionFactory) cf).createTopicConnection(username, password);
		}
		else {
			Connection con = cf.createConnection(username, password);
			if (!(con instanceof TopicConnection)) {
				throw new javax.jms.IllegalStateException("'targetConnectionFactory' is not a TopicConnectionFactory");
			}
			return (TopicConnection) con;
		}
	}

	public boolean shouldStop(Connection con) {
		return this.shouldStopConnections;
	}

}

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