kafka TopicNameExtractor 源码
kafka TopicNameExtractor 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/processor/TopicNameExtractor.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
*
* http://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.apache.kafka.streams.processor;
/**
* An interface that allows to dynamically determine the name of the Kafka topic to send at the sink node of the topology.
*/
public interface TopicNameExtractor<K, V> {
/**
* Extracts the topic name to send to. The topic name must already exist, since the Kafka Streams library will not
* try to automatically create the topic with the extracted name.
*
* @param key the record key
* @param value the record value
* @param recordContext current context metadata of the record
* @return the topic name this record should be sent to
*/
String extract(final K key, final V value, final RecordContext recordContext);
}
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