ConsulBinder.java

/*
 * Copyright 2013-2016 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.cloud.consul.binder;

import org.springframework.cloud.stream.binder.AbstractBinder;
import org.springframework.cloud.stream.binder.Binding;
import org.springframework.cloud.stream.binder.ConsumerProperties;
import org.springframework.cloud.stream.binder.DefaultBinding;
import org.springframework.cloud.stream.binder.ProducerProperties;
import org.springframework.integration.endpoint.EventDrivenConsumer;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.SubscribableChannel;
import org.springframework.util.Assert;

/**
 * @author Spencer Gibb
 */
public class ConsulBinder extends AbstractBinder<MessageChannel, ConsumerProperties, ProducerProperties> {

	private static final String BEAN_NAME_TEMPLATE = "outbound.%s";

	private final EventService eventService;

	public ConsulBinder(EventService eventService) {
		this.eventService = eventService;
	}

	@Override
	protected Binding<MessageChannel> doBindConsumer(String name, String group, MessageChannel inputChannel, ConsumerProperties properties) {
		ConsulInboundMessageProducer messageProducer = new ConsulInboundMessageProducer(this.eventService);
		messageProducer.setOutputChannel(inputChannel);
		messageProducer.setBeanFactory(this.getBeanFactory());
		messageProducer.afterPropertiesSet();
		messageProducer.start();

		return new DefaultBinding<>(name, group, inputChannel, messageProducer);
	}

	@Override
	protected Binding<MessageChannel> doBindProducer(String name, MessageChannel channel, ProducerProperties properties) {
		Assert.isInstanceOf(SubscribableChannel.class, channel);

		logger.debug("Binding Consul client to eventName " + name);
		ConsulSendingHandler sendingHandler = new ConsulSendingHandler(this.eventService.getConsulClient(), name);

		EventDrivenConsumer consumer = new EventDrivenConsumer((SubscribableChannel) channel, sendingHandler);
		consumer.setBeanFactory(getBeanFactory());
		consumer.setBeanName(String.format(BEAN_NAME_TEMPLATE, name));
		consumer.afterPropertiesSet();
		consumer.start();

		return new DefaultBinding<>(name, null, channel, consumer);
	}
}