How to add a completion advice for testing flows that contain an async handoff and the final element produces no reply http://stackoverflow.com/questions/16277487/spring-integration-unit-test-outbound-channel-adapter

AddCompletionAdvice.java

/*
 * Copyright 2002-2013 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.
 */


import java.util.Collection;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.RootBeanDefinition;

/**
 * @author Gary Russell
 *
 */
public class AddCompletionAdvice implements BeanFactoryPostProcessor {

	private final Collection<String> handlers;

	private final Collection<String> replyProducingHandlers;

	public AddCompletionAdvice(Collection<String> handlers, Collection<String> replyProducingHandlers) {
		this.handlers = handlers;
		this.replyProducingHandlers = replyProducingHandlers;
	}

	@Override
	public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
		for (String beanName : handlers) {
			defineAdviceAndInject(beanFactory, beanName, beanName + "CompletionAdvice");
		}
		for (String beanName : replyProducingHandlers) {
			String handlerBeanName = beanFactory.getAliases(beanName + ".handler")[0];
			defineAdviceAndInject(beanFactory, handlerBeanName, beanName + "CompletionAdvice");
		}
	}

	private void defineAdviceAndInject(ConfigurableListableBeanFactory beanFactory, String beanName, String adviceBeanName) {
		BeanDefinition serviceHandler = beanFactory.getBeanDefinition(beanName);
		BeanDefinition advice = new RootBeanDefinition(CompletionAdvice.class);
		((BeanDefinitionRegistry) beanFactory).registerBeanDefinition(adviceBeanName, advice);
		serviceHandler.getPropertyValues().add("adviceChain", new RuntimeBeanReference(adviceBeanName));
	}

}

CompletionAdvice.java

/*
 * Copyright 2002-2013 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.
 */

import java.util.concurrent.CountDownLatch;

import org.springframework.integration.Message;
import org.springframework.integration.handler.advice.AbstractRequestHandlerAdvice;

/**
 * @author Gary Russell
 *
 */
public class CompletionAdvice extends AbstractRequestHandlerAdvice {

	private final CountDownLatch latch = new CountDownLatch(1);

	@Override
	protected Object doInvoke(ExecutionCallback callback, Object target, Message<?> message) throws Exception {
		Object result = callback.execute();
		latch.countDown();
		return result;
	}

	public CountDownLatch getLatch() {
		return latch;
	}

}

TestAdvice-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:int="http://www.springframework.org/schema/integration"
	xsi:schemaLocation="http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration-3.0.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

	<int:publish-subscribe-channel id="input"/>

	<int:outbound-channel-adapter id="foo" channel="input" ref="x" method="handle"/>

	<int:service-activator id="bar" input-channel="input" ref="x"/>
	
	<bean class="org.springframework.integration.samples.amqp.AddCompletionAdvice">
		<constructor-arg name="handlers">
			<list>
				<value>foo</value>
			</list>
		</constructor-arg>
		<constructor-arg name="replyProducingHandlers">
			<list>
				<value>bar</value>
			</list>
		</constructor-arg>
	</bean>

	<bean id="x" class="org.springframework.integration.samples.amqp.Foo" />

</beans>

TestAdvice.java

/*
 * Copyright 2002-2013 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.
 */

import static org.junit.Assert.assertTrue;

import java.util.concurrent.TimeUnit;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.integration.Message;
import org.springframework.integration.MessageChannel;
import org.springframework.integration.message.GenericMessage;
import org.springframework.integration.samples.amqp.CompletionAdvice;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * @author Gary Russell
 *
 */
@ContextConfiguration
@RunWith(SpringJUnit4ClassRunner.class)
public class TestAdvice {

	@Autowired
	private CompletionAdvice fooCompletionAdvice;

	@Autowired
	private CompletionAdvice barCompletionAdvice;

	@Autowired
	private MessageChannel input;

	@Test
	public void test() throws Exception {
		Message<?> message = new GenericMessage<String>("Hello, world!");
		input.send(message);
		assertTrue(fooCompletionAdvice.getLatch().await(1, TimeUnit.SECONDS));
		assertTrue(barCompletionAdvice.getLatch().await(1, TimeUnit.SECONDS));
	}

}