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Spring Framework example source code file (GenericMessageEndpointFactory.java)

This example Spring Framework source code file (GenericMessageEndpointFactory.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

abstractmessageendpoint, classloader, delegatingintroductioninterceptor, genericmessageendpoint, genericmessageendpoint, internalresourceexception, internalresourceexception, messageendpoint, object, object, resourceexception, throwable, unavailableexception, unavailableexception

The Spring Framework GenericMessageEndpointFactory.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.jca.endpoint;

import javax.resource.ResourceException;
import javax.resource.spi.UnavailableException;
import javax.resource.spi.endpoint.MessageEndpoint;
import javax.transaction.xa.XAResource;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

import org.springframework.aop.framework.ProxyFactory;
import org.springframework.aop.support.DelegatingIntroductionInterceptor;
import org.springframework.util.ReflectionUtils;

/**
 * Generic implementation of the JCA 1.5
 * {@link javax.resource.spi.endpoint.MessageEndpointFactory} interface,
 * providing transaction management capabilities for any kind of message
 * listener object (e.g. {@link javax.jms.MessageListener} objects or
 * {@link javax.resource.cci.MessageListener} objects.
 *
 * <p>Uses AOP proxies for concrete endpoint instances, simply wrapping
 * the specified message listener object and exposing all of its implemented
 * interfaces on the endpoint instance.
 *
 * <p>Typically used with Spring's {@link GenericMessageEndpointManager},
 * but not tied to it. As a consequence, this endpoint factory could
 * also be used with programmatic endpoint management on a native
 * {@link javax.resource.spi.ResourceAdapter} instance.
 *
 * @author Juergen Hoeller
 * @since 2.5
 * @see #setMessageListener
 * @see #setTransactionManager
 * @see GenericMessageEndpointManager
 */
public class GenericMessageEndpointFactory extends AbstractMessageEndpointFactory {

	private Object messageListener;


	/**
	 * Specify the message listener object that the endpoint should expose
	 * (e.g. a {@link javax.jms.MessageListener} objects or
	 * {@link javax.resource.cci.MessageListener} implementation).
	 */
	public void setMessageListener(Object messageListener) {
		this.messageListener = messageListener;
	}

	/**
	 * Wrap each concrete endpoint instance with an AOP proxy,
	 * exposing the message listener's interfaces as well as the
	 * endpoint SPI through an AOP introduction.
	 */
	public MessageEndpoint createEndpoint(XAResource xaResource) throws UnavailableException {
		GenericMessageEndpoint endpoint = (GenericMessageEndpoint) super.createEndpoint(xaResource);
		ProxyFactory proxyFactory = new ProxyFactory(this.messageListener);
		DelegatingIntroductionInterceptor introduction = new DelegatingIntroductionInterceptor(endpoint);
		introduction.suppressInterface(MethodInterceptor.class);
		proxyFactory.addAdvice(introduction);
		return (MessageEndpoint) proxyFactory.getProxy();
	}

	/**
	 * Creates a concrete generic message endpoint, internal to this factory.
	 */
	protected AbstractMessageEndpoint createEndpointInternal() throws UnavailableException {
		return new GenericMessageEndpoint();
	}


	/**
	 * Private inner class that implements the concrete generic message endpoint,
	 * as an AOP Alliance MethodInterceptor that will be invoked by a proxy.
	 */
	private class GenericMessageEndpoint extends AbstractMessageEndpoint implements MethodInterceptor {

		public Object invoke(MethodInvocation methodInvocation) throws Throwable {
			boolean applyDeliveryCalls = !hasBeforeDeliveryBeenCalled();
			if (applyDeliveryCalls) {
				try {
					beforeDelivery(null);
				}
				catch (ResourceException ex) {
					if (ReflectionUtils.declaresException(methodInvocation.getMethod(), ex.getClass())) {
						throw ex;
					}
					else {
						throw new InternalResourceException(ex);
					}
				}
			}
			try {
				return methodInvocation.proceed();
			}
			catch (Throwable ex) {
				onEndpointException(ex);
				throw ex;
			}
			finally {
				if (applyDeliveryCalls) {
					try {
						afterDelivery();
					}
					catch (ResourceException ex) {
						if (ReflectionUtils.declaresException(methodInvocation.getMethod(), ex.getClass())) {
							throw ex;
						}
						else {
							throw new InternalResourceException(ex);
						}
					}
				}
			}
		}

		protected ClassLoader getEndpointClassLoader() {
			return messageListener.getClass().getClassLoader();
		}
	}


	/**
	 * Internal exception thrown when a ResourceExeption has been encountered
	 * during the endpoint invocation.
	 * <p>Will only be used if the ResourceAdapter does not invoke the
	 * endpoint's <code>beforeDelivery and afterDelivery
	 * directly, leavng it up to the concrete endpoint to apply those -
	 * and to handle any ResourceExceptions thrown from them.
	 */
	public static class InternalResourceException extends RuntimeException {

		protected InternalResourceException(ResourceException cause) {
			super(cause);
		}
	}

}

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