/*
 * Copyright 2017 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.cloud.stream.testing.source;

import java.util.concurrent.atomic.AtomicBoolean;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.messaging.Source;
import org.springframework.context.annotation.Bean;
import org.springframework.integration.annotation.InboundChannelAdapter;
import org.springframework.integration.annotation.Poller;
import org.springframework.integration.core.MessageSource;
import org.springframework.messaging.support.GenericMessage;

/**
 * The Spring Cloud Stream Source application,
 * which generates each 100 milliseconds "foo" or "bar" string in round-robin manner.
 *
 * @author Artem Bilan
 *
 */
@SpringBootApplication
@EnableBinding(Source.class)
public class FooBarSource {

	private AtomicBoolean semaphore = new AtomicBoolean(true);

	@Bean
	@InboundChannelAdapter(channel = Source.OUTPUT, poller = @Poller(fixedDelay = "100"))
	public MessageSource<String> fooBarStrings() {
		return () ->
				new GenericMessage<>(this.semaphore.getAndSet(!this.semaphore.get()) ? "foo" : "bar");
	}

	public static void main(String[] args) {
		SpringApplication.run(FooBarSource.class, args);
	}

}
