spring-kafka BatchMessageListener 源码
spring-kafka BatchMessageListener 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/listener/BatchMessageListener.java
/*
* Copyright 2015-2019 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.listener;
import java.util.List;
import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.springframework.kafka.support.Acknowledgment;
import org.springframework.lang.Nullable;
/**
* Listener for handling a batch of incoming Kafka messages; the list
* is created from the consumer records object returned by a poll.
*
* @param <K> the key type.
* @param <V> the value type.
*
* @author Marius Bogoevici
* @author Gary Russell
*
* @since 1.1
*/
@FunctionalInterface
public interface BatchMessageListener<K, V> extends GenericMessageListener<List<ConsumerRecord<K, V>>> {
/**
* Listener receives the original {@link ConsumerRecords} object instead of a
* list of {@link ConsumerRecord}.
* @param records the records.
* @param acknowledgment the acknowledgment (null if not manual acks)
* @param consumer the consumer.
* @since 2.2
*/
default void onMessage(ConsumerRecords<K, V> records, @Nullable Acknowledgment acknowledgment,
Consumer<K, V> consumer) {
throw new UnsupportedOperationException("This batch listener doesn't support ConsumerRecords");
}
/**
* Return true if this listener wishes to receive the original {@link ConsumerRecords}
* object instead of a list of {@link ConsumerRecord}.
* @return true for consumer records.
* @since 2.2
*/
default boolean wantsPollResult() {
return false;
}
}
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