code: /*
   * Copyright 2019 Mitsunori Komatsu (komamitsu)
   *
   * 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 org.komamitsu.fluency.fluentd.recordformat;
  
  import com.fasterxml.jackson.core.JsonProcessingException;
  import org.komamitsu.fluency.recordformat.AbstractRecordFormatter;
  import org.komamitsu.fluency.recordformat.RecordFormatter;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.Arrays;
  import java.util.Map;
  
  public class FluentdRecordFormatter
          extends AbstractRecordFormatter
          implements RecordFormatter
  {
      private static final Logger LOG = LoggerFactory.getLogger(FluentdRecordFormatter.class);
  
      public FluentdRecordFormatter()
      {
          this(new Config());
      }
  
      public FluentdRecordFormatter(Config config)
      {
          super(config);
      }
  
      @Override
      public byte[] format(String tag, Object timestamp, Map<String, Object> data)
      {
          try {
              return objectMapperForMessagePack.writeValueAsBytes(Arrays.asList(timestamp, data));
          }
          catch (JsonProcessingException e) {
              throw new IllegalArgumentException(
                      String.format(
                              "Failed to convert the record to MessagePack format: cause=%s, tag=%s, timestamp=%s, recordCount=%d",
                              e.getMessage(),
                              tag, timestamp, data.size())
              );
          }
      }
  
      @Override
      public byte[] formatFromMessagePack(String tag, Object timestamp, byte[] mapValue, int offset, int len)
      {
          try {
              ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
              // 2 items array
              outputStream.write(0x92);
              objectMapperForMessagePack.writeValue(outputStream, timestamp);
              outputStream.write(mapValue, offset, len);
              outputStream.close();
  
              return outputStream.toByteArray();
          }
          catch (IOException e) {
              throw new IllegalArgumentException(
                      String.format(
                              "Failed to convert the record to MessagePack format: cause=%s, tag=%s, timestamp=%s, dataSize=%s",
                              e.getMessage(),
                              tag, timestamp, mapValue.length)
              );
          }
      }
  
      @Override
      public byte[] formatFromMessagePack(String tag, Object timestamp, ByteBuffer mapValue)
      {
          int mapValueLen = mapValue.remaining();
          try {
              ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
              // 2 items array
              outputStream.write(0x92);
              objectMapperForMessagePack.writeValue(outputStream, timestamp);
              while (mapValue.hasRemaining()) {
                  outputStream.write(mapValue.get());
              }
              outputStream.close();
  
              return outputStream.toByteArray();
          }
          catch (IOException e) {
              throw new IllegalArgumentException(
                      String.format(
                              "Failed to convert the record to MessagePack format: cause=%s, tag=%s, timestamp=%s, dataSize=%s",
                              e.getMessage(),
                              tag, timestamp, mapValueLen)
              );
          }
      }
  
      @Override
      public String formatName()
      {
          return "fluentd-packedforward";
      }
  
      public static class Config
              extends RecordFormatter.Config
      {
      }
  }
  