DSL Gateway Per Service

InlineGateways.java

/*
 * Copyright 2015 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 foo;

import static org.junit.Assert.assertEquals;

import org.junit.Test;
import org.junit.runner.RunWith;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.annotation.MessageEndpoint;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.channel.DirectChannel;
import org.springframework.integration.config.EnableIntegration;
import org.springframework.integration.core.MessagingTemplate;
import org.springframework.integration.dsl.IntegrationFlow;
import org.springframework.messaging.MessageChannel;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import foo.InlineGateways.FooConfig;

/**
 * @author Gary Russell
 * @since 4.2
 *
 */
@ContextConfiguration(classes=FooConfig.class)
@RunWith(SpringJUnit4ClassRunner.class)
public class InlineGateways {

	@Autowired
	@Qualifier("gatewayFlow.input")
	private MessageChannel start;

	@Autowired
	private ApplicationContext ctx;

	@Test
	public void test() {
		MessagingTemplate template = new MessagingTemplate(start);
		assertEquals("foofoofoofoofoofoofoofoo", template.convertSendAndReceive("foo", String.class));
	}

	@Configuration
	@EnableIntegration
	@ComponentScan
	public static class FooConfig {

		@Bean
		public IntegrationFlow gatewayFlow() {
			return f -> f
					.gateway("s1", e -> e.errorChannel("e1"))
					.gateway("s2", e -> e.errorChannel("e2"))
					.gateway("s3", e -> e.errorChannel("e3"));
		}

		@Bean
		public MessageChannel e1() {
			return new DirectChannel();
		}

		@Bean
		public MessageChannel e2() {
			return new DirectChannel();
		}

		@Bean
		public MessageChannel e3() {
			return new DirectChannel();
		}

	}

	@MessageEndpoint
	public static class Service1 {

		@ServiceActivator(inputChannel="s1")
		public String handle(String in) {
			return in + in;
		}
	}

	@MessageEndpoint
	public static class Service2 {

		@ServiceActivator(inputChannel="s2")
		public String handle(String in) {
			return in + in;
		}
	}

	@MessageEndpoint
	public static class Service3 {

		@ServiceActivator(inputChannel="s3")
		public String handle(String in) {
			return in + in;
		}
	}

}