spring-kafka BatchMessageConverter 源码
spring-kafka BatchMessageConverter 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/support/converter/BatchMessageConverter.java
/*
* Copyright 2016-2019 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.support.converter;
import java.lang.reflect.Type;
import java.util.List;
import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.springframework.kafka.support.Acknowledgment;
import org.springframework.lang.NonNull;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
/**
* A Kafka-specific {@link Message} converter strategy.
*
* @author Gary Russell
* @since 1.1
*/
public interface BatchMessageConverter extends MessageConverter {
/**
* Convert a list of {@link ConsumerRecord} to a {@link Message}.
* @param records the records.
* @param acknowledgment the acknowledgment.
* @param consumer the consumer.
* @param payloadType the required payload type.
* @return the message.
*/
@NonNull
Message<?> toMessage(List<ConsumerRecord<?, ?>> records, @Nullable Acknowledgment acknowledgment,
Consumer<?, ?> consumer, Type payloadType);
/**
* Convert a message to a producer record.
* @param message the message.
* @param defaultTopic the default topic to use if no header found.
* @return the producer records.
*/
List<ProducerRecord<?, ?>> fromMessage(Message<?> message, String defaultTopic);
/**
* Return the record converter used by this batch converter, if configured,
* or null.
* @return the converter or null.
* @since 2.1.5
*/
@Nullable
default RecordMessageConverter getRecordMessageConverter() {
return null;
}
}
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