spring-kafka MessageConverter 源码
spring-kafka MessageConverter 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/support/converter/MessageConverter.java
/*
* Copyright 2016-2022 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.util.Map;
import org.apache.kafka.clients.consumer.Consumer;
import org.springframework.kafka.support.Acknowledgment;
import org.springframework.kafka.support.JavaUtils;
import org.springframework.kafka.support.KafkaHeaders;
import org.springframework.kafka.support.KafkaUtils;
import org.springframework.lang.Nullable;
/**
* A top level interface for message converters.
*
* @author Gary Russell
* @since 1.1
*
*/
public interface MessageConverter {
/**
* Get the thread bound group id.
* @return the group id.
*/
@Nullable
static String getGroupId() {
return KafkaUtils.getConsumerGroupId();
}
/**
* Set up the common headers.
* @param acknowledgment the acknowledgment.
* @param consumer the consumer.
* @param rawHeaders the raw headers map.
* @param theKey the key.
* @param topic the topic.
* @param partition the partition.
* @param offset the offfset.
* @param timestampType the timestamp type.
* @param timestamp the timestamp.
*/
default void commonHeaders(Acknowledgment acknowledgment, Consumer<?, ?> consumer, Map<String, Object> rawHeaders,
@Nullable Object theKey, Object topic, Object partition, Object offset,
@Nullable Object timestampType, Object timestamp) {
rawHeaders.put(KafkaHeaders.RECEIVED_TOPIC, topic);
rawHeaders.put(KafkaHeaders.RECEIVED_PARTITION, partition);
rawHeaders.put(KafkaHeaders.OFFSET, offset);
rawHeaders.put(KafkaHeaders.TIMESTAMP_TYPE, timestampType);
rawHeaders.put(KafkaHeaders.RECEIVED_TIMESTAMP, timestamp);
JavaUtils.INSTANCE
.acceptIfNotNull(KafkaHeaders.RECEIVED_KEY, theKey, (key, val) -> rawHeaders.put(key, val))
.acceptIfNotNull(KafkaHeaders.GROUP_ID, MessageConverter.getGroupId(),
(key, val) -> rawHeaders.put(key, val))
.acceptIfNotNull(KafkaHeaders.ACKNOWLEDGMENT, acknowledgment, (key, val) -> rawHeaders.put(key, val))
.acceptIfNotNull(KafkaHeaders.CONSUMER, consumer, (key, val) -> rawHeaders.put(key, val));
}
}
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