content: /*
   * 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.
   */
  @FunctionalInterface
  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);
  }
  