spring-kafka AcknowledgingMessageListener 源码

  • 2022-08-16
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spring-kafka AcknowledgingMessageListener 代码

文件路径:/spring-kafka/src/main/java/org/springframework/kafka/listener/AcknowledgingMessageListener.java

/*
 * Copyright 2015-2021 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.kafka.listener;

import org.apache.kafka.clients.consumer.ConsumerRecord;

import org.springframework.kafka.support.Acknowledgment;
import org.springframework.lang.Nullable;

/**
 * Listener for handling incoming Kafka messages, propagating an acknowledgment handle that recipients
 * can invoke when the message has been processed.
 *
 * @param <K> the key type.
 * @param <V> the value type.
 *
 * @author Marius Bogoevici
 * @author Gary Russell
 */
@FunctionalInterface
public interface AcknowledgingMessageListener<K, V> extends MessageListener<K, V> {

	/**
	 * Invoked with data from kafka. Containers should never call this since it they
	 * will detect that we are an acknowledging listener.
	 * @param data the data to be processed.
	 */
	@Override
	default void onMessage(ConsumerRecord<K, V> data) {
		throw new UnsupportedOperationException("Container should never call this");
	}

	/**
	 * Invoked with data from kafka.
	 * @param data the data to be processed.
	 * @param acknowledgment the acknowledgment.
	 */
	@Override
	void onMessage(ConsumerRecord<K, V> data, @Nullable Acknowledgment acknowledgment);

}

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