spring-kafka KafkaNullAwarePayloadArgumentResolver 源码
spring-kafka KafkaNullAwarePayloadArgumentResolver 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/annotation/KafkaNullAwarePayloadArgumentResolver.java
/*
* Copyright 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.annotation;
import java.util.List;
import org.springframework.core.MethodParameter;
import org.springframework.kafka.support.KafkaNull;
import org.springframework.messaging.Message;
import org.springframework.messaging.converter.MessageConverter;
import org.springframework.messaging.handler.annotation.support.PayloadMethodArgumentResolver;
import org.springframework.validation.Validator;
/**
* {@link PayloadMethodArgumentResolver} that can properly decode {@link KafkaNull}
* payloads, returning {@code null}. When using a custom
* {@link org.springframework.messaging.handler.annotation.support.MessageHandlerMethodFactory},
* add this resolver if you need to handle tombstone records with null values.
*
* @author Gary Russell
* @since 2.7.4
*
*/
public class KafkaNullAwarePayloadArgumentResolver extends PayloadMethodArgumentResolver {
KafkaNullAwarePayloadArgumentResolver(MessageConverter messageConverter, Validator validator) {
super(messageConverter, validator);
}
@Override
public Object resolveArgument(MethodParameter parameter, Message<?> message) throws Exception { // NOSONAR
Object resolved = super.resolveArgument(parameter, message);
/*
* Replace KafkaNull list elements with null.
*/
if (resolved instanceof List) {
List<?> list = ((List<?>) resolved);
for (int i = 0; i < list.size(); i++) {
if (list.get(i) instanceof KafkaNull) {
list.set(i, null);
}
}
}
return resolved;
}
@Override
protected boolean isEmptyPayload(Object payload) {
return payload == null || payload instanceof KafkaNull;
}
}
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