spring-kafka AdapterUtils 源码
spring-kafka AdapterUtils 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/listener/adapter/AdapterUtils.java
/*
* Copyright 2020-2021 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.listener.adapter;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;
import org.apache.kafka.common.TopicPartition;
import org.springframework.expression.ParserContext;
import org.springframework.expression.common.TemplateParserContext;
import org.springframework.kafka.support.KafkaHeaders;
import org.springframework.lang.Nullable;
/**
* Utilities for listener adapters.
*
* @author Gary Russell
* @since 2.5
*
*/
public final class AdapterUtils {
/**
* Parser context for runtime SpEL using ! as the template prefix.
* @since 2.2.15
*/
public static final ParserContext PARSER_CONTEXT = new TemplateParserContext("!{", "}");
private AdapterUtils() {
}
/**
* Build a {@link ConsumerRecordMetadata} from the first {@link ConsumerRecord} in data, if any.
* @param data the data array.
* @return the metadata or null if data does not contain a {@link ConsumerRecord}.
*/
@Nullable
public static Object buildConsumerRecordMetadataFromArray(Object... data) {
for (Object object : data) {
ConsumerRecordMetadata metadata = buildConsumerRecordMetadata(object);
if (metadata != null) {
return metadata;
}
}
return null;
}
/**
* Build a {@link ConsumerRecordMetadata} from data which must be a
* {@link ConsumerRecord}.
* @param data the record.
* @return the metadata or null if data is not a {@link ConsumerRecord}.
*/
@Nullable
public static ConsumerRecordMetadata buildConsumerRecordMetadata(Object data) {
if (!(data instanceof ConsumerRecord)) {
return null;
}
ConsumerRecord<?, ?> record = (ConsumerRecord<?, ?>) data;
return new ConsumerRecordMetadata(new RecordMetadata(new TopicPartition(record.topic(), record.partition()),
record.offset(), 0, record.timestamp(), record.serializedKeySize(),
record.serializedValueSize()), record.timestampType());
}
/**
* Return the default expression when no SendTo value is present.
* @return the expression.
* @since 2.2.15
*/
public static String getDefaultReplyTopicExpression() {
return PARSER_CONTEXT.getExpressionPrefix() + "source.headers['"
+ KafkaHeaders.REPLY_TOPIC + "']" + PARSER_CONTEXT.getExpressionSuffix();
}
}
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