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.state.internals;
  
  import org.apache.kafka.common.utils.Bytes;
  import org.apache.kafka.streams.state.KeyValueStore;
  
  public class ChangeLoggingListValueBytesStore extends ChangeLoggingKeyValueBytesStore {
  
      ChangeLoggingListValueBytesStore(final KeyValueStore<Bytes, byte[]> inner) {
          super(inner);
      }
  
      @Override
      public void put(final Bytes key, final byte[] value) {
          wrapped().put(key, value);
          // the provided new value will be added to the list in the inner put()
          // we need to log the full new list and thus call get() on the inner store below
          // if the value is a tombstone, we delete the whole list and thus can save the get call
          if (value == null) {
              log(key, null, internalContext.recordContext().timestamp());
          } else {
              log(key, wrapped().get(key), internalContext.recordContext().timestamp());
          }
      }
  
      @Override
      public byte[] putIfAbsent(final Bytes key, final byte[] value) {
          final byte[] oldValue = wrapped().get(key);
  
          if (oldValue != null) {
              put(key, value);
          }
  
          // TODO: here we always return null so that deser would not fail.
          //       we only do this since we know the only caller (stream-stream join processor)
          //       would not need the actual value at all
          return null;
      }
  
  }
  