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.tools.consumer;
  
  import org.apache.kafka.clients.consumer.ConsumerRecord;
  import org.apache.kafka.common.MessageFormatter;
  import org.apache.kafka.common.record.TimestampType;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.PrintStream;
  import java.nio.charset.StandardCharsets;
  import java.util.Map;
  
  class LoggingMessageFormatter implements MessageFormatter {
  
      private static final Logger LOG = LoggerFactory.getLogger(LoggingMessageFormatter.class);
      private final DefaultMessageFormatter defaultWriter = new DefaultMessageFormatter();
  
      @Override
      public void configure(Map<String, ?> configs) {
          defaultWriter.configure(configs);
      }
  
      @Override
      public void writeTo(ConsumerRecord<byte[], byte[]> consumerRecord, PrintStream output) {
          defaultWriter.writeTo(consumerRecord, output);
          String timestamp = consumerRecord.timestampType() != TimestampType.NO_TIMESTAMP_TYPE
                  ? consumerRecord.timestampType() + ":" + consumerRecord.timestamp() + ", "
                  : "";
          String key = "key:" + (consumerRecord.key() == null ? "null " : new String(consumerRecord.key(), StandardCharsets.UTF_8) + ", ");
          String value = "value:" + (consumerRecord.value() == null ? "null" : new String(consumerRecord.value(), StandardCharsets.UTF_8));
          LOG.info(timestamp + key + value);
      }
  }
  