spring-kafka BytesJsonMessageConverter 源码
spring-kafka BytesJsonMessageConverter 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/support/converter/BytesJsonMessageConverter.java
/*
* Copyright 2018-2021 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 org.apache.kafka.common.utils.Bytes;
import org.springframework.messaging.Message;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
* JSON Message converter - {@code Bytes} on output, String, Bytes, or byte[] on input.
* Used in conjunction with Kafka
* {@code BytesSerializer/(BytesDeserializer, ByteArrayDeserializer, or StringDeserializer)}.
* More efficient than {@link StringJsonMessageConverter} because the
* {@code String<->byte[]} conversion is avoided.
*
* @author Gary Russell
* @since 2.1.7
*
*/
public class BytesJsonMessageConverter extends JsonMessageConverter {
public BytesJsonMessageConverter() {
}
public BytesJsonMessageConverter(ObjectMapper objectMapper) {
super(objectMapper);
}
@Override
protected Object convertPayload(Message<?> message) {
try {
return Bytes.wrap(getObjectMapper().writeValueAsBytes(message.getPayload()));
}
catch (JsonProcessingException e) {
throw new ConversionException("Failed to convert to JSON", message, e);
}
}
}
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