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 co.airy.core.communication.lucene;
  
  import org.apache.kafka.common.serialization.Serializer;
  import org.apache.kafka.streams.processor.ProcessorContext;
  import org.apache.kafka.streams.processor.internals.ProcessorStateManager;
  import org.apache.kafka.streams.processor.internals.RecordCollector;
  import org.apache.kafka.streams.state.StateSerdes;
  
  /**
   * This file is copied and licensed as-is from the Kafka Streams source
   * since the underlying class is not public.
   *
   * see https://github.com/apache/kafka/blob/33ba2820f4fbb459172022a83d761a7c674a8fdd/streams/src/main/java/org/apache/kafka/streams/state/internals/StoreChangeLogger.java#L33
   */
  class StoreChangeLogger<K, V> {
  
      private final String topic;
      private final int partition;
      private final ProcessorContext context;
      private final RecordCollector collector;
      private final Serializer<K> keySerializer;
      private final Serializer<V> valueSerializer;
  
      StoreChangeLogger(final String storeName,
                        final ProcessorContext context,
                        final StateSerdes<K, V> serialization) {
          this(storeName, context, context.taskId().partition, serialization);
      }
  
      private StoreChangeLogger(final String storeName,
                                final ProcessorContext context,
                                final int partition,
                                final StateSerdes<K, V> serialization) {
          topic = ProcessorStateManager.storeChangelogTopic(context.applicationId(), storeName);
          this.context = context;
          this.partition = partition;
          this.collector = ((RecordCollector.Supplier) context).recordCollector();
          keySerializer = serialization.keySerializer();
          valueSerializer = serialization.valueSerializer();
      }
  
      void logChange(final K key,
                     final V value) {
          logChange(key, value, context.timestamp());
      }
  
      void logChange(final K key,
                     final V value,
                     final long timestamp) {
          // Sending null headers to changelog topics (KIP-244)
          collector.send(topic, key, value, null, partition, timestamp, keySerializer, valueSerializer);
      }
  }
  