/*
 * Copyright 2017-2018 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 com.example;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.cloud.stream.messaging.Sink;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessagingException;

/**
 * Example of a sink for the sample app.
 *
 * @author João André Martins
 */
@EnableBinding(Sink.class)
public class SinkExample {

	private static final Log LOGGER = LogFactory.getLog(SinkExample.class);

	@StreamListener(Sink.INPUT)
	public void handleMessage(UserMessage userMessage) {
		if (userMessage.isThrowError()) {
			throw new RuntimeException("An error was triggered in the message handler!");
		}

		LOGGER.info("New message received from " + userMessage.getUsername() + ": " + userMessage.getBody() +
				" at " + userMessage.getCreatedAt());
	}

	// Note that the error inputChannel is formatted as [Pub/Sub subscription name with group].[group name].errors
	// If you change the topic name in application.properties, you also have to change the inputChannel below.
	@ServiceActivator(inputChannel = "my-topic.my-group.errors")
	public void error(Message<MessagingException> message) {
		LOGGER.error("The message that was sent is now processed by the error handler.");
		LOGGER.error("Failed message: " + message.getPayload().getFailedMessage());
	}
}

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Fix error in comment for pubsub stream binder sample (#2160)