code: /*
   * Copyright 2012-2018 Chronicle Map Contributors
   *
   * 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
   *
   *     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 net.openhft.chronicle.map;
  
  import net.openhft.chronicle.hash.Data;
  import org.jetbrains.annotations.NotNull;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  class LoggingMapEntryOperations<K, V> implements MapEntryOperations<K, V, Void> {
  
      static final Logger LOG = LoggerFactory.getLogger(LoggingMapEntryOperations.class);
  
      @Override
      public Void replaceValue(@NotNull MapEntry<K, V> entry, Data<V> newValue) {
          LOG.info("replace: old key: {}, old value: {}, new value: {}",
                  entry.key(), entry.value(), newValue);
          entry.doReplaceValue(newValue);
          return null;
      }
  }
  