spring-kafka BatchToRecordAdapter 源码
spring-kafka BatchToRecordAdapter 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/listener/adapter/BatchToRecordAdapter.java
/*
* Copyright 2020 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.adapter;
import java.util.List;
import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.kafka.support.Acknowledgment;
import org.springframework.messaging.Message;
/**
* An adapter that adapts a batch listener to a record listener method. Use this, for
* example, if you want a batch to be processed in a single transaction but wish to invoke
* the listener with each message individually.
*
* @param <K> the key type.
* @param <V> the value type.
*
* @author Gary Russell
* @since 2.4.2
*
*/
@FunctionalInterface
public interface BatchToRecordAdapter<K, V> {
/**
* Adapt the list and invoke the callback for each message.
* @param messages the messages.
* @param records the records.
* @param ack the acknowledgment.
* @param consumer the consumer.
* @param callback the callback.
*/
void adapt(List<Message<?>> messages, List<ConsumerRecord<K, V>> records, Acknowledgment ack,
Consumer<?, ?> consumer, Callback<K, V> callback);
/**
* A callback for each message.
*
* @param <K> the key type.
* @param <V> the value type.
*/
@FunctionalInterface
interface Callback<K, V> {
/**
* Handle each message.
* @param record the record.
* @param ack the acknowledgment.
* @param consumer the consumer.
* @param message the message.
*/
void invoke(ConsumerRecord<K, V> record, Acknowledgment ack, Consumer<?, ?> consumer,
Message<?> message);
}
}
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