spring-kafka ProducerListener 源码
spring-kafka ProducerListener 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/support/ProducerListener.java
/*
* Copyright 2015-2020 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.support;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;
import org.springframework.lang.Nullable;
/**
* Listener for handling outbound Kafka messages. Exactly one of its methods will be invoked, depending on whether
* the write has been acknowledged or not.
*
* Its main goal is to provide a stateless singleton delegate for {@link org.apache.kafka.clients.producer.Callback}s,
* which, in all but the most trivial cases, requires creating a separate instance per message.
*
* @param <K> the key type.
* @param <V> the value type.
*
* @author Marius Bogoevici
* @author Gary Russell
* @author Endika Gutiérrez
*
* @see org.apache.kafka.clients.producer.Callback
*/
public interface ProducerListener<K, V> {
/**
* Invoked after the successful send of a message (that is, after it has been acknowledged by the broker).
* @param producerRecord the actual sent record
* @param recordMetadata the result of the successful send operation
*/
default void onSuccess(ProducerRecord<K, V> producerRecord, RecordMetadata recordMetadata) {
}
/**
* Invoked after an attempt to send a message has failed.
* @param producerRecord the failed record
* @param recordMetadata The metadata for the record that was sent (i.e. the partition
* and offset). If an error occurred, metadata will contain only valid topic and maybe
* the partition. If the partition is not provided in the ProducerRecord and an error
* occurs before partition is assigned, then the partition will be set to
* RecordMetadata.UNKNOWN_PARTITION.
* @param exception the exception thrown
* @since 2.6.2
*/
default void onError(ProducerRecord<K, V> producerRecord, @Nullable RecordMetadata recordMetadata,
Exception exception) {
}
}
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