/*
 * Copyright 2014-2019 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
 *
 *      https://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.scattergather.config;

import static org.assertj.core.api.Assertions.assertThat;

import java.util.List;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.integration.gateway.RequestReplyExchanger;
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;

/**
 * @author Artem Bilan
 * @author Gary Russell
 *
 * @since 4.1
 */
@ContextConfiguration
@RunWith(SpringJUnit4ClassRunner.class)
@DirtiesContext
public class ScatterGatherTests {

	@Autowired
	private PollableChannel output;

	@Autowired
	private MessageChannel inputAuction;

	@Autowired
	private MessageChannel inputDistribution;

	@Autowired
	private RequestReplyExchanger gateway;

	@Autowired
	private MessageChannel scatterGatherWithinChain;

	@Test
	public void testAuction() {
		this.inputAuction.send(new GenericMessage<>("foo"));
		Message<?> bestQuoteMessage = this.output.receive(10000);
		assertThat(bestQuoteMessage)
				.isNotNull()
				.extracting(Message::getPayload)
				.isInstanceOf(List.class)
				.asList()
				.hasSizeGreaterThanOrEqualTo(1);
	}

	@Test
	public void testDistribution() {
		this.inputDistribution.send(new GenericMessage<>("foo"));
		Message<?> bestQuoteMessage = this.output.receive(10000);
		assertThat(bestQuoteMessage)
				.isNotNull()
				.extracting(Message::getPayload)
				.isInstanceOf(List.class)
				.asList()
				.hasSizeGreaterThanOrEqualTo(1);
	}

	@Test
	public void testGatewayScatterGather() {
		Message<?> bestQuoteMessage = this.gateway.exchange(new GenericMessage<>("foo"));
		assertThat(bestQuoteMessage)
				.isNotNull()
				.extracting(Message::getPayload)
				.isInstanceOf(List.class)
				.asList()
				.hasSizeGreaterThanOrEqualTo(1);

		bestQuoteMessage = this.gateway.exchange(new GenericMessage<>("bar"));
		assertThat(bestQuoteMessage)
				.isNotNull()
				.extracting(Message::getPayload)
				.isInstanceOf(List.class)
				.asList()
				.hasSizeGreaterThanOrEqualTo(1);
	}

	@Test
	public void testWithinChain() {
		this.scatterGatherWithinChain.send(new GenericMessage<>("foo"));
		for (int i = 0; i < 3; i++) {
			Message<?> result = this.output.receive(10000);
			assertThat(result).isNotNull();
		}
	}

}
