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

Spring Framework example source code file (JndiDestinationResolver.java)

This example Spring Framework source code file (JndiDestinationResolver.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

cachingdestinationresolver, destination, destination, destinationresolutionexception, destinationresolutionexception, dynamicdestinationresolver, jmsexception, jndi, jndi, jndilocatorsupport, map, naming, namingexception, string, string, util

The Spring Framework JndiDestinationResolver.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.support.destination;

import java.util.Map;

import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.Topic;
import javax.naming.NamingException;

import org.springframework.core.CollectionFactory;
import org.springframework.jndi.JndiLocatorSupport;
import org.springframework.util.Assert;

/**
 * {@link DestinationResolver} implementation which interprets destination names
 * as JNDI locations (with a configurable fallback strategy).
 *
 * <p>Allows for customizing the JNDI environment if necessary, for example
 * specifying appropriate JNDI environment properties.
 *
 * <p>Dynamic queues and topics get cached by destination name. As a consequence,
 * you need to use unique destination names across both queues and topics.
 * Caching can be turned off through the {@link #setCache "cache"} flag.
 *
 * <p>Note that the fallback to resolution of dynamic destinations
 * is turned <i>off by default. Switch the
 * {@link #setFallbackToDynamicDestination "fallbackToDynamicDestination"}
 * flag on to enable this functionality.
 *
 * @author Mark Pollack
 * @author Juergen Hoeller
 * @since 1.1
 * @see #setJndiTemplate
 * @see #setJndiEnvironment
 * @see #setCache
 * @see #setFallbackToDynamicDestination
 */
public class JndiDestinationResolver extends JndiLocatorSupport implements CachingDestinationResolver {

	private boolean cache = true;

	private boolean fallbackToDynamicDestination = false;

	private DestinationResolver dynamicDestinationResolver = new DynamicDestinationResolver();

	private final Map destinationCache = CollectionFactory.createConcurrentMapIfPossible(16);


	/**
	 * Set whether to cache resolved destinations. Default is "true".
	 * <p>This flag can be turned off to re-lookup a destination for each operation,
	 * which allows for hot restarting of destinations. This is mainly useful
	 * during development.
	 * <p>Note that dynamic queues and topics get cached by destination name.
	 * As a consequence, you need to use unique destination names across both
	 * queues and topics.
	 */
	public void setCache(boolean cache) {
		this.cache = cache;
	}

	/**
	 * Set whether this resolver is supposed to create dynamic destinations
	 * if the destination name is not found in JNDI. Default is "false".
	 * <p>Turn this flag on to enable transparent fallback to dynamic destinations.
	 * @see #setDynamicDestinationResolver
	 */
	public void setFallbackToDynamicDestination(boolean fallbackToDynamicDestination) {
		this.fallbackToDynamicDestination = fallbackToDynamicDestination;
	}

	/**
	 * Set the {@link DestinationResolver} to use when falling back to dynamic
	 * destinations.
	 * <p>The default is Spring's standard {@link DynamicDestinationResolver}.
	 * @see #setFallbackToDynamicDestination
	 * @see DynamicDestinationResolver
	 */
	public void setDynamicDestinationResolver(DestinationResolver dynamicDestinationResolver) {
		this.dynamicDestinationResolver = dynamicDestinationResolver;
	}


	public Destination resolveDestinationName(Session session, String destinationName, boolean pubSubDomain)
			throws JMSException {

		Assert.notNull(destinationName, "Destination name must not be null");
		Destination dest = (Destination) this.destinationCache.get(destinationName);
		if (dest != null) {
			validateDestination(dest, destinationName, pubSubDomain);
		}
		else {
			try {
				dest = (Destination) lookup(destinationName, Destination.class);
				validateDestination(dest, destinationName, pubSubDomain);
			}
			catch (NamingException ex) {
				if (logger.isDebugEnabled()) {
					logger.debug("Destination [" + destinationName + "] not found in JNDI", ex);
				}
				if (this.fallbackToDynamicDestination) {
					dest = this.dynamicDestinationResolver.resolveDestinationName(session, destinationName, pubSubDomain);
				}
				else {
					throw new DestinationResolutionException(
							"Destination [" + destinationName + "] not found in JNDI", ex);
				}
			}
			if (this.cache) {
				this.destinationCache.put(destinationName, dest);
			}
		}
		return dest;
	}

	/**
	 * Validate the given Destination object, checking whether it matches
	 * the expected type.
	 * @param destination the Destination object to validate
	 * @param destinationName the name of the destination
	 * @param pubSubDomain <code>true if a Topic is expected,
	 * <code>false in case of a Queue
	 */
	protected void validateDestination(Destination destination, String destinationName, boolean pubSubDomain) {
		Class targetClass = Queue.class;
		if (pubSubDomain) {
			targetClass = Topic.class;
		}
		if (!targetClass.isInstance(destination)) {
			throw new DestinationResolutionException(
					"Destination [" + destinationName + "] is not of expected type [" + targetClass.getName() + "]");
		}
	}


	public void removeFromCache(String destinationName) {
		this.destinationCache.remove(destinationName);
	}

	public void clearCache() {
		this.destinationCache.clear();
	}

}

Other Spring Framework examples (source code examples)

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



my book on functional programming

 

new blog posts

 

Copyright 1998-2019 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.