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.server.common.serialization;
  
  import org.apache.kafka.common.protocol.ApiMessage;
  import org.apache.kafka.common.protocol.ByteBufferAccessor;
  import org.apache.kafka.common.protocol.ObjectSerializationCache;
  import org.apache.kafka.common.protocol.Readable;
  import org.apache.kafka.server.common.ApiMessageAndVersion;
  
  import java.nio.ByteBuffer;
  
  /**
   * This class provides conversion of {@code ApiMessageAndVersion} to bytes and vice versa. This can be used as serialization protocol for any
   * metadata records derived of {@code ApiMessage}s. It internally uses {@link AbstractApiMessageSerde} for serialization/deserialization
   * mechanism.
   * <br><br>
   * Implementors need to extend this class and implement {@link #apiMessageFor(short)} method to return a respective
   * {@code ApiMessage} for the given {@code apiKey}. This is required to deserialize the bytes to build the respective
   * {@code ApiMessage} instance.
   */
  public abstract class BytesApiMessageSerde {
  
      private final AbstractApiMessageSerde apiMessageSerde = new AbstractApiMessageSerde() {
          @Override
          public ApiMessage apiMessageFor(short apiKey) {
              return BytesApiMessageSerde.this.apiMessageFor(apiKey);
          }
      };
  
      public byte[] serialize(ApiMessageAndVersion messageAndVersion) {
          ObjectSerializationCache cache = new ObjectSerializationCache();
          int size = apiMessageSerde.recordSize(messageAndVersion, cache);
          ByteBufferAccessor writable = new ByteBufferAccessor(ByteBuffer.allocate(size));
          apiMessageSerde.write(messageAndVersion, cache, writable);
  
          return writable.buffer().array();
      }
  
      public ApiMessageAndVersion deserialize(byte[] data) {
          Readable readable = new ByteBufferAccessor(ByteBuffer.wrap(data));
  
          return apiMessageSerde.read(readable, data.length);
      }
  
      /**
       * Return {@code ApiMessage} instance for the given {@code apiKey}. This is used while deserializing the bytes
       * payload into the respective {@code ApiMessage} in {@link #deserialize(byte[])} method.
       *
       * @param apiKey apiKey for which a {@code ApiMessage} to be created.
       */
      public abstract ApiMessage apiMessageFor(short apiKey);
  
  }