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Spring Framework example source code file (UserCredentialsConnectionFactoryAdapter.java)

This example Spring Framework source code file (UserCredentialsConnectionFactoryAdapter.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, connectionfactory, initializingbean, jmsexception, jmsexception, jmsusercredentials, jmsusercredentials, queueconnection, queueconnectionfactory, queueconnectionfactory, string, string, topicconnection, topicconnectionfactory

The Spring Framework UserCredentialsConnectionFactoryAdapter.java source code

/*
 * Copyright 2002-2008 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.core.NamedThreadLocal;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * An adapter for a target JMS {@link javax.jms.ConnectionFactory}, applying the
 * given user credentials to every standard <code>createConnection() call,
 * that is, implicitly invoking <code>createConnection(username, password)
 * on the target. All other methods simply delegate to the corresponding methods
 * of the target ConnectionFactory.
 *
 * <p>Can be used to proxy a target JNDI ConnectionFactory that does not have user
 * credentials configured. Client code can work with the ConnectionFactory without
 * passing in username and password on every <code>createConnection() call.
 *
 * <p>In the following example, client code can simply transparently work
 * with the preconfigured "myConnectionFactory", implicitly accessing
 * "myTargetConnectionFactory" with the specified user credentials.
 *
 * <pre class="code">
 * <bean id="myTargetConnectionFactory" class="org.springframework.jndi.JndiObjectFactoryBean">
 *   <property name="jndiName" value="java:comp/env/jms/mycf"/>
 * </bean>
 *
 * <bean id="myConnectionFactory" class="org.springframework.jms.connection.UserCredentialsConnectionFactoryAdapter">
 *   <property name="targetConnectionFactory" ref="myTargetConnectionFactory"/>
 *   <property name="username" value="myusername"/>
 *   <property name="password" value="mypassword"/>
 * </bean></pre>
 *
 * <p>If the "username" is empty, this proxy will simply delegate to the standard
 * <code>createConnection() method of the target ConnectionFactory.
 * This can be used to keep a UserCredentialsConnectionFactoryAdapter bean
 * definition just for the <i>option of implicitly passing in user credentials
 * if the particular target ConnectionFactory requires it.
 *
 * @author Juergen Hoeller
 * @since 1.2
 * @see #createConnection
 * @see #createQueueConnection
 * @see #createTopicConnection
 */
public class UserCredentialsConnectionFactoryAdapter
		implements ConnectionFactory, QueueConnectionFactory, TopicConnectionFactory, InitializingBean {

	private ConnectionFactory targetConnectionFactory;

	private String username;

	private String password;

	private final ThreadLocal threadBoundCredentials = new NamedThreadLocal("Current JMS user credentials");


	/**
	 * 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;
	}

	/**
	 * Set the username that this adapter should use for retrieving Connections.
	 * Default is no specific user.
	 */
	public void setUsername(String username) {
		this.username = username;
	}

	/**
	 * Set the password that this adapter should use for retrieving Connections.
	 * Default is no specific password.
	 */
	public void setPassword(String password) {
		this.password = password;
	}

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


	/**
	 * Set user credententials for this proxy and the current thread.
	 * The given username and password will be applied to all subsequent
	 * <code>createConnection() calls on this ConnectionFactory proxy.
	 * <p>This will override any statically specified user credentials,
	 * that is, values of the "username" and "password" bean properties.
	 * @param username the username to apply
	 * @param password the password to apply
	 * @see #removeCredentialsFromCurrentThread
	 */
	public void setCredentialsForCurrentThread(String username, String password) {
		this.threadBoundCredentials.set(new JmsUserCredentials(username, password));
	}

	/**
	 * Remove any user credentials for this proxy from the current thread.
	 * Statically specified user credentials apply again afterwards.
	 * @see #setCredentialsForCurrentThread
	 */
	public void removeCredentialsFromCurrentThread() {
		this.threadBoundCredentials.set(null);
	}


	/**
	 * Determine whether there are currently thread-bound credentials,
	 * using them if available, falling back to the statically specified
	 * username and password (i.e. values of the bean properties) else.
	 * @see #doCreateConnection
	 */
	public final Connection createConnection() throws JMSException {
		JmsUserCredentials threadCredentials = (JmsUserCredentials) this.threadBoundCredentials.get();
		if (threadCredentials != null) {
			return doCreateConnection(threadCredentials.username, threadCredentials.password);
		}
		else {
			return doCreateConnection(this.username, this.password);
		}
	}

	/**
	 * Delegate the call straight to the target ConnectionFactory.
	 */
	public Connection createConnection(String username, String password) throws JMSException {
		return doCreateConnection(username, password);
	}

	/**
	 * This implementation delegates to the <code>createConnection(username, password)
	 * method of the target ConnectionFactory, passing in the specified user credentials.
	 * If the specified username is empty, it will simply delegate to the standard
	 * <code>createConnection() method of the target ConnectionFactory.
	 * @param username the username to use
	 * @param password the password to use
	 * @return the Connection
	 * @see javax.jms.ConnectionFactory#createConnection(String, String)
	 * @see javax.jms.ConnectionFactory#createConnection()
	 */
	protected Connection doCreateConnection(String username, String password) throws JMSException {
		Assert.state(this.targetConnectionFactory != null, "'targetConnectionFactory' is required");
		if (StringUtils.hasLength(username)) {
			return this.targetConnectionFactory.createConnection(username, password);
		}
		else {
			return this.targetConnectionFactory.createConnection();
		}
	}


	/**
	 * Determine whether there are currently thread-bound credentials,
	 * using them if available, falling back to the statically specified
	 * username and password (i.e. values of the bean properties) else.
	 * @see #doCreateQueueConnection
	 */
	public final QueueConnection createQueueConnection() throws JMSException {
		JmsUserCredentials threadCredentials = (JmsUserCredentials) this.threadBoundCredentials.get();
		if (threadCredentials != null) {
			return doCreateQueueConnection(threadCredentials.username, threadCredentials.password);
		}
		else {
			return doCreateQueueConnection(this.username, this.password);
		}
	}

	/**
	 * Delegate the call straight to the target QueueConnectionFactory.
	 */
	public QueueConnection createQueueConnection(String username, String password) throws JMSException {
		return doCreateQueueConnection(username, password);
	}

	/**
	 * This implementation delegates to the <code>createQueueConnection(username, password)
	 * method of the target QueueConnectionFactory, passing in the specified user credentials.
	 * If the specified username is empty, it will simply delegate to the standard
	 * <code>createQueueConnection() method of the target ConnectionFactory.
	 * @param username the username to use
	 * @param password the password to use
	 * @return the Connection
	 * @see javax.jms.QueueConnectionFactory#createQueueConnection(String, String)
	 * @see javax.jms.QueueConnectionFactory#createQueueConnection()
	 */
	protected QueueConnection doCreateQueueConnection(String username, String password) throws JMSException {
		Assert.state(this.targetConnectionFactory != null, "'targetConnectionFactory' is required");
		if (!(this.targetConnectionFactory instanceof QueueConnectionFactory)) {
			throw new javax.jms.IllegalStateException("'targetConnectionFactory' is not a QueueConnectionFactory");
		}
		QueueConnectionFactory queueFactory = (QueueConnectionFactory) this.targetConnectionFactory;
		if (StringUtils.hasLength(username)) {
			return queueFactory.createQueueConnection(username, password);
		}
		else {
			return queueFactory.createQueueConnection();
		}
	}


	/**
	 * Determine whether there are currently thread-bound credentials,
	 * using them if available, falling back to the statically specified
	 * username and password (i.e. values of the bean properties) else.
	 * @see #doCreateTopicConnection
	 */
	public final TopicConnection createTopicConnection() throws JMSException {
		JmsUserCredentials threadCredentials = (JmsUserCredentials) this.threadBoundCredentials.get();
		if (threadCredentials != null) {
			return doCreateTopicConnection(threadCredentials.username, threadCredentials.password);
		}
		else {
			return doCreateTopicConnection(this.username, this.password);
		}
	}

	/**
	 * Delegate the call straight to the target TopicConnectionFactory.
	 */
	public TopicConnection createTopicConnection(String username, String password) throws JMSException {
		return doCreateTopicConnection(username, password);
	}

	/**
	 * This implementation delegates to the <code>createTopicConnection(username, password)
	 * method of the target TopicConnectionFactory, passing in the specified user credentials.
	 * If the specified username is empty, it will simply delegate to the standard
	 * <code>createTopicConnection() method of the target ConnectionFactory.
	 * @param username the username to use
	 * @param password the password to use
	 * @return the Connection
	 * @see javax.jms.TopicConnectionFactory#createTopicConnection(String, String)
	 * @see javax.jms.TopicConnectionFactory#createTopicConnection()
	 */
	protected TopicConnection doCreateTopicConnection(String username, String password) throws JMSException {
		Assert.state(this.targetConnectionFactory != null, "'targetConnectionFactory' is required");
		if (!(this.targetConnectionFactory instanceof TopicConnectionFactory)) {
			throw new javax.jms.IllegalStateException("'targetConnectionFactory' is not a TopicConnectionFactory");
		}
		TopicConnectionFactory queueFactory = (TopicConnectionFactory) this.targetConnectionFactory;
		if (StringUtils.hasLength(username)) {
			return queueFactory.createTopicConnection(username, password);
		}
		else {
			return queueFactory.createTopicConnection();
		}
	}


	/**
	 * Inner class used as ThreadLocal value.
	 */
	private static class JmsUserCredentials {

		public final String username;

		public final String password;

		private JmsUserCredentials(String username, String password) {
			this.username = username;
			this.password = password;
		}

		public String toString() {
			return "JmsUserCredentials[username='" + this.username + "',password='" + this.password + "']";
		}
	}

}

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