ReactorTests.java

/*
 * Copyright 2014 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.integration.dsl.test.reactor;

import static org.hamcrest.Matchers.instanceOf;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertThat;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

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.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.channel.QueueChannel;
import org.springframework.integration.config.EnableIntegration;
import org.springframework.integration.core.MessagingTemplate;
import org.springframework.integration.dsl.IntegrationFlow;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.PollableChannel;
import org.springframework.messaging.support.GenericMessage;
import org.springframework.test.annotation.DirtiesContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import reactor.core.Environment;
import reactor.rx.Streams;
import reactor.rx.stream.HotStream;

/**
 * @author Artem Bilan
 */
@ContextConfiguration
@RunWith(SpringJUnit4ClassRunner.class)
@DirtiesContext
public class ReactorTests {

	@Autowired
	@Qualifier("reactorStreamFlow.input")
	private MessageChannel reactorStreamFlowChannel;

	@Autowired
	@Qualifier("reactorStreamResult")
	private PollableChannel reactorStreamResult;

	@Autowired
	@Qualifier("reactorPromiseFlow.input")
	private MessageChannel reactorPromiseFlowChannel;

	@Autowired
	@Qualifier("reactorPromiseResult")
	private PollableChannel reactorPromiseResult;

	@Test
	public void testReactorStreamFlow() {
		List<Integer> payload = new ArrayList<>(10);
		for (int i = 1; i <= 10; i++) {
			payload.add(i);
		}

		this.reactorStreamFlowChannel.send(new GenericMessage<>(payload));

		Message<?> receive = this.reactorStreamResult.receive(5000);
		assertNotNull(receive);
		assertThat(receive.getPayload(), instanceOf(List.class));
		List<?> results = (List<?>) receive.getPayload();

		for (int i = 1; i <= 10; i++) {
			Object actual = results.get(i - 1);
			assertEquals("S" + (i * 2), actual);
		}
	}

	@Test
	public void testReactorPromiseFlow() throws InterruptedException {
		List<Integer> payload = new ArrayList<>(10);
		for (int i = 1; i <= 10; i++) {
			payload.add(i);
		}

		this.reactorPromiseFlowChannel.send(new GenericMessage<>(payload));

		Message<?> receive = this.reactorPromiseResult.receive(5000);
		assertNotNull(receive);
		assertThat(receive.getPayload(), instanceOf(List.class));
		List<?> results = (List<?>) receive.getPayload();

		for (int i = 1; i <= 10; i++) {
			Object actual = results.get(i - 1);
			assertEquals("P" + (i * 3), actual);
		}
	}


	@Configuration
	@EnableIntegration
	public static class ContextConfiguration {

		@Bean
		public Environment reactorEnv() {
			return new Environment();
		}

		@Bean
		public MessagingTemplate messagingTemplate() {
			return new MessagingTemplate();
		}

		@Bean
		public PollableChannel reactorStreamResult() {
			return new QueueChannel();
		}

		@Bean
		public HotStream<Object> reactorStream() {
			HotStream<Object> stream = Streams.defer(reactorEnv());
			stream.<List<String>>flatMap(data -> Streams.defer((Iterable<?>) data)
					.map(v -> "S" + ((int) v * 2)).buffer())
					.consume(v -> messagingTemplate().convertAndSend(reactorStreamResult(), v));
			return stream;
		}

		@Bean
		public IntegrationFlow reactorStreamFlow() {
			return f -> f.handle(m -> reactorStream().broadcastNext(m.getPayload()));
		}

		@Bean
		public IntegrationFlow reactorPromiseFlow() {
			return f -> f
					.handle((p, h) -> Streams.just(p)
									.dispatchOn(reactorEnv())
									.<Integer>split()
									.<String>parallel(10, s -> s.map(v -> "P" + (v * 3)))
									.toList()
									.poll(3, TimeUnit.SECONDS))
					.channel(c -> c.queue("reactorPromiseResult"));
		}

	}

}